Pub Date : 2024-04-15DOI: 10.1088/1555-6611/ad3ae7
Dexian Yan, Ziwei Yuan, Jianzhong Qiu, Xiangjun Li
A novel type of polarization negative curvature terahertz fiber has been designed, which has a cladding region composed of two long semi-circular cladding tubes in the horizontal direction and four long semi-elliptical cladding tubes in the oblique direction. The optimal fiber dimensions are determined to investigate the internal relationship between polarization characteristics and fiber cladding structure. The transmission performances of the negative curvature fiber are investigated by varying the thickness of fiber cladding tubes and adjusting the structural characteristics of cladding tubes in different directions. Relatively good transmission performances can be obtained with a cladding tube thickness of 80 μm. The birefringence can be stably maintained at the order of 10−4, and the confinement loss of the x-polarized mode at 2.55 THz is 0.036 dB cm−1. Moreover, the dispersion coefficient of the two polarized modes is stable between ±0.6 ps (THz·cm)−1 in the 2.3–2.6 THz band. The bent performance of the designed fiber at 2.52 THz is also discussed. The results show that the fiber has low bending sensitivity, and can still maintain excellent birefringence and low confinement loss in the bending state. For the y polarization, the birefringence can be basically stabilized at the order of 10−4 within a bending radius of 10–60 cm.
设计了一种新型偏振负曲率太赫兹光纤，其包层区域在水平方向上由两个半圆形长包层管组成，在倾斜方向上由四个半椭圆形长包层管组成。通过确定最佳光纤尺寸，研究了偏振特性与光纤包层结构之间的内在关系。通过改变光纤包层管的厚度和调整不同方向包层管的结构特性，研究了负曲率光纤的传输性能。包层管厚度为 80 μm 时，可获得相对较好的传输性能。双折射可稳定地保持在 10-4 的数量级，2.55 太赫兹 x 偏振模式的约束损耗为 0.036 dB cm-1。此外，在 2.3-2.6 THz 波段，两个极化模式的色散系数稳定在 ±0.6 ps (THz-cm)-1 之间。此外，还讨论了所设计光纤在 2.52 THz 波段的弯曲性能。结果表明，该光纤的弯曲灵敏度较低，在弯曲状态下仍能保持出色的双折射和较低的约束损耗。对于 y 偏振，在弯曲半径为 10-60 厘米的范围内，双折射可基本稳定在 10-4 的数量级。
{"title":"Influence of cladding tube structure on transmission characteristics of negative curvature terahertz fiber","authors":"Dexian Yan, Ziwei Yuan, Jianzhong Qiu, Xiangjun Li","doi":"10.1088/1555-6611/ad3ae7","DOIUrl":"https://doi.org/10.1088/1555-6611/ad3ae7","url":null,"abstract":"A novel type of polarization negative curvature terahertz fiber has been designed, which has a cladding region composed of two long semi-circular cladding tubes in the horizontal direction and four long semi-elliptical cladding tubes in the oblique direction. The optimal fiber dimensions are determined to investigate the internal relationship between polarization characteristics and fiber cladding structure. The transmission performances of the negative curvature fiber are investigated by varying the thickness of fiber cladding tubes and adjusting the structural characteristics of cladding tubes in different directions. Relatively good transmission performances can be obtained with a cladding tube thickness of 80 <italic toggle=\"yes\">μ</italic>m. The birefringence can be stably maintained at the order of 10<sup>−4</sup>, and the confinement loss of the <italic toggle=\"yes\">x</italic>-polarized mode at 2.55 THz is 0.036 dB cm<sup>−1</sup>. Moreover, the dispersion coefficient of the two polarized modes is stable between ±0.6 ps (THz·cm)<sup>−1</sup> in the 2.3–2.6 THz band. The bent performance of the designed fiber at 2.52 THz is also discussed. The results show that the fiber has low bending sensitivity, and can still maintain excellent birefringence and low confinement loss in the bending state. For the <italic toggle=\"yes\">y</italic> polarization, the birefringence can be basically stabilized at the order of 10<sup>−4</sup> within a bending radius of 10–60 cm.","PeriodicalId":17976,"journal":{"name":"Laser Physics","volume":"6 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140611557","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-11DOI: 10.1088/1555-6611/ad38b1
Malika Amari, Carlos Rodriguez-Benites, Alaa A Omran, Majli Nema Hawas, Abhinav Kumar, Laith H Alzubaidi, Shafik Shaker Shafik
The experimental realization of two-dimensional (2D) electromagnetically induced grating is explored by monitoring the Fraunhofer diffraction pattern in a microwave-driven four-level Y-type atomic medium under the action of two orthogonal standing-wave (SW) fields. Due to the position-dependent atom–field interaction, the information about the high diffraction order of the probe light can be obtained via the Fraunhofer diffraction pattern of the probe light. It is found that the diffraction behavior is significantly improved due to the joint quantum interference induced by the SW and microwave-driven cycling fields. Most importantly, the amplitude and phase diagram of the transmission function of the probe light can be modulated at a particular position and the probe energy may transfer to the high orders of the diffraction by properly adjusting the system parameters. The proposed scheme may provide a promising way to achieve highly sensitive diffraction patterns with applications in quantum information processing.
在两个正交驻波（SW）场的作用下，通过监测微波驱动的四电平 Y 型原子介质中的夫琅和费衍射图样，探索了二维（2D）电磁诱导光栅的实验实现。由于原子-场相互作用与位置有关，因此可以通过探测光的夫琅和费衍射图样获得探测光的高衍射阶数信息。研究发现，由于 SW 场和微波驱动循环场共同诱导的量子干涉，衍射行为得到了显著改善。最重要的是，探针光透射函数的振幅和相位图可以在特定位置进行调制，通过适当调整系统参数，探针能量可以转移到衍射的高阶。所提出的方案为实现高灵敏度的衍射图样提供了一种可行的方法，可应用于量子信息处理领域。
{"title":"Microwave assisted Fraunhofer diffraction pattern in a four-level light–matter coupling scheme","authors":"Malika Amari, Carlos Rodriguez-Benites, Alaa A Omran, Majli Nema Hawas, Abhinav Kumar, Laith H Alzubaidi, Shafik Shaker Shafik","doi":"10.1088/1555-6611/ad38b1","DOIUrl":"https://doi.org/10.1088/1555-6611/ad38b1","url":null,"abstract":"The experimental realization of two-dimensional (2D) electromagnetically induced grating is explored by monitoring the Fraunhofer diffraction pattern in a microwave-driven four-level Y-type atomic medium under the action of two orthogonal standing-wave (SW) fields. Due to the position-dependent atom–field interaction, the information about the high diffraction order of the probe light can be obtained via the Fraunhofer diffraction pattern of the probe light. It is found that the diffraction behavior is significantly improved due to the joint quantum interference induced by the SW and microwave-driven cycling fields. Most importantly, the amplitude and phase diagram of the transmission function of the probe light can be modulated at a particular position and the probe energy may transfer to the high orders of the diffraction by properly adjusting the system parameters. The proposed scheme may provide a promising way to achieve highly sensitive diffraction patterns with applications in quantum information processing.","PeriodicalId":17976,"journal":{"name":"Laser Physics","volume":"23 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140611828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-09DOI: 10.1088/1555-6611/ad38b3
Haroon Asghar, Rizwan Ahmed, Zeshan A Umar, Tahani A Alrebdi, M Aslam Baig
In this work, we investigate the effect of carbon-doped silver nanoparticles on the Q-switched performance of erbium-doped fiber laser (EDFL). The carbon-doped silver nanoparticles were synthesized using a laser ablation method. The prepared nanoparticles were inserted between fiber ferrules using the adhesion process of the index-matched gel. Incorporating a saturable absorber inside the laser cavity initiates a stable Q-switched mechanism at 11.2 mW of threshold power. The measured results demonstrate that as the pump power of EDFL increases from 11.2 to 267 mW, the pulse repetition, and pulse width tuned from 21.33 to 95.2 kHz and 13.3–3.18 µs, respectively. At 267 mW of pump, the maximum average output power, pulse energy, and peak power were further measured to be 2.36 mW, 24.68 nJ, and 7.76 mW, respectively. Besides, the stability and threshold characteristics of EDFL based on carbon-doped silver nanoparticles were further explored. This study shows that the synthesis of metal nanoparticles using the laser ablation technique and their implementation as saturable absorber represents a promising avenue for advancing ultrafast laser technologies with improved stablility, efficiency, and tunability.
{"title":"Passively Q-switched Er-doped fiber laser based on carbon-doped silver nanoparticles saturable absorber prepared using laser ablation method","authors":"Haroon Asghar, Rizwan Ahmed, Zeshan A Umar, Tahani A Alrebdi, M Aslam Baig","doi":"10.1088/1555-6611/ad38b3","DOIUrl":"https://doi.org/10.1088/1555-6611/ad38b3","url":null,"abstract":"In this work, we investigate the effect of carbon-doped silver nanoparticles on the Q-switched performance of erbium-doped fiber laser (EDFL). The carbon-doped silver nanoparticles were synthesized using a laser ablation method. The prepared nanoparticles were inserted between fiber ferrules using the adhesion process of the index-matched gel. Incorporating a saturable absorber inside the laser cavity initiates a stable Q-switched mechanism at 11.2 mW of threshold power. The measured results demonstrate that as the pump power of EDFL increases from 11.2 to 267 mW, the pulse repetition, and pulse width tuned from 21.33 to 95.2 kHz and 13.3–3.18 <italic toggle=\"yes\">µ</italic>s, respectively. At 267 mW of pump, the maximum average output power, pulse energy, and peak power were further measured to be 2.36 mW, 24.68 nJ, and 7.76 mW, respectively. Besides, the stability and threshold characteristics of EDFL based on carbon-doped silver nanoparticles were further explored. This study shows that the synthesis of metal nanoparticles using the laser ablation technique and their implementation as saturable absorber represents a promising avenue for advancing ultrafast laser technologies with improved stablility, efficiency, and tunability.","PeriodicalId":17976,"journal":{"name":"Laser Physics","volume":"61 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140611558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-04DOI: 10.1088/1555-6611/ad38b2
M M Xu, Z R Li, M Hu, Y Y Ji, M H Bi, H Z Li, X F Zhou, S Q Pan, C Liu
We experimentally demonstrated the phenomenon of period-multiplying pulses in the self-mode-locking Nd:YVO4 laser. With a fixed cavity length of 50 mm and the input mirrors in the resonator with radii of curvature of 100 mm, 200 mm, and 500 mm, the mode-locked pulses with pulse periods 4 times, 6 times and 10 times the fundamental mode-locked pulse period are observed respectively. Besides, by tilting the angle of the output mirror to control the spatial distribution of transverse modes, the switching between the period-multiplication state and its harmonic self-locking state can be achieved. Numerical simulations further confirm that this period-multiplying phenomenon results from the simultaneous locking of multi-longitudinal and multi-transverse modes. This study is of great significance for understanding the complex transverse dynamics in the self-mode-locking lasers.
{"title":"Period-multiplying pulses generation by total self-mode-locking of Nd:YVO4 lasers","authors":"M M Xu, Z R Li, M Hu, Y Y Ji, M H Bi, H Z Li, X F Zhou, S Q Pan, C Liu","doi":"10.1088/1555-6611/ad38b2","DOIUrl":"https://doi.org/10.1088/1555-6611/ad38b2","url":null,"abstract":"We experimentally demonstrated the phenomenon of period-multiplying pulses in the self-mode-locking Nd:YVO<sub>4</sub> laser. With a fixed cavity length of 50 mm and the input mirrors in the resonator with radii of curvature of 100 mm, 200 mm, and 500 mm, the mode-locked pulses with pulse periods 4 times, 6 times and 10 times the fundamental mode-locked pulse period are observed respectively. Besides, by tilting the angle of the output mirror to control the spatial distribution of transverse modes, the switching between the period-multiplication state and its harmonic self-locking state can be achieved. Numerical simulations further confirm that this period-multiplying phenomenon results from the simultaneous locking of multi-longitudinal and multi-transverse modes. This study is of great significance for understanding the complex transverse dynamics in the self-mode-locking lasers.","PeriodicalId":17976,"journal":{"name":"Laser Physics","volume":"10 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140602856","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Nonlinear dissipative systems support pulsating solutions and exhibit many interesting dynamic behaviors. Here, we report various soliton pulsations and explosions in an all-normal dispersion ytterbium-doped fiber laser by utilizing the dispersive Fourier transform technique. By the different soliton dynamics, these phenomena can be classified into single-soliton pulsation and explosion, dual-soliton synchronous and asynchronous pulsation, as well as dual-soliton asynchronous explosion. Solitons exhibit identical periodic fluctuations in the synchronous pulsation while showing the anti-phase behavior in asynchronous pulsation. The dual-soliton asynchronous pulsation might be related to the periodic modulation of the polarization state of solitons. As for the dual-soliton asynchronous explosion, it can be regarded as the asynchronously triggered transient solitons containing periodic explosion through the gain-mediated soliton interactions. These findings may provide new insights into complex dynamics in the field of ultrafast lasers.
{"title":"Real-time observation of soliton pulsation and explosion in an Yb-doped fiber laser","authors":"Mingzhu Fu, Xude Wang, Yuhan Fan, Mengxiang Lu, Kaixin Li, Suwen Li","doi":"10.1088/1555-6611/ad38b0","DOIUrl":"https://doi.org/10.1088/1555-6611/ad38b0","url":null,"abstract":"Nonlinear dissipative systems support pulsating solutions and exhibit many interesting dynamic behaviors. Here, we report various soliton pulsations and explosions in an all-normal dispersion ytterbium-doped fiber laser by utilizing the dispersive Fourier transform technique. By the different soliton dynamics, these phenomena can be classified into single-soliton pulsation and explosion, dual-soliton synchronous and asynchronous pulsation, as well as dual-soliton asynchronous explosion. Solitons exhibit identical periodic fluctuations in the synchronous pulsation while showing the anti-phase behavior in asynchronous pulsation. The dual-soliton asynchronous pulsation might be related to the periodic modulation of the polarization state of solitons. As for the dual-soliton asynchronous explosion, it can be regarded as the asynchronously triggered transient solitons containing periodic explosion through the gain-mediated soliton interactions. These findings may provide new insights into complex dynamics in the field of ultrafast lasers.","PeriodicalId":17976,"journal":{"name":"Laser Physics","volume":"5 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140589238","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-03DOI: 10.1088/1555-6611/ad35b3
Yong He, Qi Chen
We propose a high-sensitivity mass sensor, which is realized by a three-mode optomechanical system composed of an optical cavity with gain, an optical cavity with loss, and a mechanical resonator with loss. When the system’s parameters satisfy certain conditions, a higher-order exceptional point (EP) is shown in the eigenfrequency spectrum. Some particles with a tiny mass deposited in the mechanical resonator can give rise to the mechanical frequency shift so that the higher-order EP splits into three points, which correspond to three eigenfrequency shifts. We can obtain the adsorbed mass by measuring one of the eigenfrequency shifts. By introducing a sensitivity enhancement factor, we demonstrate that an optomechanical system with a higher decay rate can be used to implement a mass sensor with higher sensitivity. Our scheme provides important theoretical guidance for further optimization and improvement of optomechanical mass sensors.
我们提出了一种高灵敏度质量传感器，它是由一个带增益的光腔、一个带损耗的光腔和一个带损耗的机械谐振器组成的三模式光机械系统实现的。当系统参数满足特定条件时，特征频谱中会出现一个高阶异常点（EP）。一些质量很小的粒子沉积在机械谐振器中，会引起机械频移，从而使高阶 EP 分裂成三个点，对应于三个特征频移。我们可以通过测量其中一个特征频移来获得吸附质量。通过引入灵敏度增强因子，我们证明了具有较高衰减率的光机械系统可用于实现灵敏度更高的质量传感器。我们的方案为进一步优化和改进光机械质量传感器提供了重要的理论指导。
{"title":"Sensitivity of mass sensors enhanced by higher-order exceptional points in an optomechanical system","authors":"Yong He, Qi Chen","doi":"10.1088/1555-6611/ad35b3","DOIUrl":"https://doi.org/10.1088/1555-6611/ad35b3","url":null,"abstract":"We propose a high-sensitivity mass sensor, which is realized by a three-mode optomechanical system composed of an optical cavity with gain, an optical cavity with loss, and a mechanical resonator with loss. When the system’s parameters satisfy certain conditions, a higher-order exceptional point (EP) is shown in the eigenfrequency spectrum. Some particles with a tiny mass deposited in the mechanical resonator can give rise to the mechanical frequency shift so that the higher-order EP splits into three points, which correspond to three eigenfrequency shifts. We can obtain the adsorbed mass by measuring one of the eigenfrequency shifts. By introducing a sensitivity enhancement factor, we demonstrate that an optomechanical system with a higher decay rate can be used to implement a mass sensor with higher sensitivity. Our scheme provides important theoretical guidance for further optimization and improvement of optomechanical mass sensors.","PeriodicalId":17976,"journal":{"name":"Laser Physics","volume":"33 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140589365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The collision between high-energy electrons and linearly polarized laser pulses is systematically studied, which has significant application value. The effect of different laser parameters on the spectrum and power angular distribution has been analyzed. The maximum transverse amplitude of the electron motion track changes as one moves farther away from the focal point acting as the electronic initial position. Concurrently, an extensive examination of the off-axis properties of the electron is carried out. As the form of scattering changes from linear to nonlinear, the angular radiation of its power distribution exhibits intriguing characteristics. We found the ‘hysteresis’ phenomenon of the radiation characteristics. Our research can serve as a useful resource for comprehending and using laser electron interactions.
{"title":"Hysteresis phenomenon in single electron nonlinear Thomson scattering in tightly focused linearly polarized lasers caused by collision position changes","authors":"Mingjing Zeng, Yangyi Zhang, Yifan Chang, Zekai Yu, Youwei Tian","doi":"10.1088/1555-6611/ad3428","DOIUrl":"https://doi.org/10.1088/1555-6611/ad3428","url":null,"abstract":"The collision between high-energy electrons and linearly polarized laser pulses is systematically studied, which has significant application value. The effect of different laser parameters on the spectrum and power angular distribution has been analyzed. The maximum transverse amplitude of the electron motion track changes as one moves farther away from the focal point acting as the electronic initial position. Concurrently, an extensive examination of the off-axis properties of the electron is carried out. As the form of scattering changes from linear to nonlinear, the angular radiation of its power distribution exhibits intriguing characteristics. We found the ‘hysteresis’ phenomenon of the radiation characteristics. Our research can serve as a useful resource for comprehending and using laser electron interactions.","PeriodicalId":17976,"journal":{"name":"Laser Physics","volume":"2010 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140315059","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-27DOI: 10.1088/1555-6611/ad3433
HaiPeng Zeng, Aijie Ma
This study explores the Goos–Hänchen (GH) shift phenomenon within a cavity hosting a V-type three-level atomic system, engaged with two independent broadband squeezed baths. Our exploration encompasses a thorough analysis of the lateral shifts in both reflected and transmitted light beams, with a focus on the impact of critical factors, i.e, coupling field strength, incoherent pumping field strength, and squeezed vacuum intensity. Our results reveal an interplay of these parameters, resulting in distinctive negative and positive GH shifts in both reflected and transmitted light. In addition, a remarkable enhancement of GH shifts at specific angles of incidence is observed, presenting a wide-ranging modulation across diverse system parameters. This study not only enriches the understanding of the GH shift in complex atomic systems but also highlights the potential for the manipulation of these lateral shifts by fine-tuning key variables of the system, and contributes valuable insights to the broader field of optical phenomena in quantum systems.
本研究探讨了在一个装有 V 型三电平原子系统的腔体内，在两个独立的宽带挤压浴中发生的 Goos-Hänchen (GH) 移位现象。我们的探索包括对反射光束和透射光束的横向偏移进行全面分析，重点关注耦合场强、非相干抽运场强和挤压真空强度等关键因素的影响。我们的研究结果表明，这些参数之间的相互作用会导致反射光和透射光出现明显的负向和正向 GH 偏移。此外，我们还观察到在特定入射角度下 GH 偏移明显增强，呈现出跨越不同系统参数的大范围调制。这项研究不仅丰富了人们对复杂原子系统中伽马偏移的理解，而且突出了通过微调系统的关键变量来操纵这些横向偏移的潜力，并为量子系统中更广泛的光学现象领域贡献了宝贵的见解。
{"title":"Goos–Hänchen shifts in a V-type three-level atomic system interacting with squeezed vacuum","authors":"HaiPeng Zeng, Aijie Ma","doi":"10.1088/1555-6611/ad3433","DOIUrl":"https://doi.org/10.1088/1555-6611/ad3433","url":null,"abstract":"This study explores the Goos–Hänchen (GH) shift phenomenon within a cavity hosting a V-type three-level atomic system, engaged with two independent broadband squeezed baths. Our exploration encompasses a thorough analysis of the lateral shifts in both reflected and transmitted light beams, with a focus on the impact of critical factors, i.e, coupling field strength, incoherent pumping field strength, and squeezed vacuum intensity. Our results reveal an interplay of these parameters, resulting in distinctive negative and positive GH shifts in both reflected and transmitted light. In addition, a remarkable enhancement of GH shifts at specific angles of incidence is observed, presenting a wide-ranging modulation across diverse system parameters. This study not only enriches the understanding of the GH shift in complex atomic systems but also highlights the potential for the manipulation of these lateral shifts by fine-tuning key variables of the system, and contributes valuable insights to the broader field of optical phenomena in quantum systems.","PeriodicalId":17976,"journal":{"name":"Laser Physics","volume":"117 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140315157","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-27DOI: 10.1088/1555-6611/ad2dd0
Jiarui Wang, Yaoyu Zhang, Yongliang Li
We report a quasi-three-level laser pumped Ca4GdO(BO3)3 (Yb:GdCOB) tunable laser based on the transition from the 2F5/2 level to the 2F7/2 level. By adjusting the 902 nm pump power, a continuous waves Yb:GdCOB laser was obtained with the near-infrared wavelengths shifting from 1030 nm to 1036 nm. The highest tuning power of 2.5 W was achieved with a slope efficiency of 19.9%. To our knowledge, it is the first tunable Yb:GdCOB laser to be realized by adjusting the pump power. This work provides a novel method to generate tunable solid-state lasers with a compact and simple structure.
{"title":"Quasi-three-level laser pumped Yb:GdCOB tunable laser from 1030 to 1036 nm","authors":"Jiarui Wang, Yaoyu Zhang, Yongliang Li","doi":"10.1088/1555-6611/ad2dd0","DOIUrl":"https://doi.org/10.1088/1555-6611/ad2dd0","url":null,"abstract":"We report a quasi-three-level laser pumped Ca<sub>4</sub>GdO(BO<sub>3</sub>)<sub>3</sub> (Yb:GdCOB) tunable laser based on the transition from the <sup>2</sup>\u0000<italic toggle=\"yes\">F</italic>\u0000<sub>5/2</sub> level to the <sup>2</sup>\u0000<italic toggle=\"yes\">F</italic>\u0000<sub>7/2</sub> level. By adjusting the 902 nm pump power, a continuous waves Yb:GdCOB laser was obtained with the near-infrared wavelengths shifting from 1030 nm to 1036 nm. The highest tuning power of 2.5 W was achieved with a slope efficiency of 19.9%. To our knowledge, it is the first tunable Yb:GdCOB laser to be realized by adjusting the pump power. This work provides a novel method to generate tunable solid-state lasers with a compact and simple structure.","PeriodicalId":17976,"journal":{"name":"Laser Physics","volume":"107 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140315009","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-08DOI: 10.1088/1555-6611/ad2bfa
Marisa da Cunha Sales, Giovanna de Pontes dos Santos, Ana Caroline da Silva Ferreira, Andre Luiz Mencalha, Adenilson de Souza da Fonseca
Laser devices are light sources that emit monochromatic, coherent, and collimated electromagnetic radiation beams. Low-power lasers are widely used to treat clinical conditions based on the photobiomodulation effect. Despite therapeutic applications, mainly in continuous waves, limited data are available on photobiomodulation effects induced by low-power lasers in the pulsed emission mode. Thus, the aim of this study was to evaluate the effects of a low-power pulsed infrared laser on survival, proliferation, DNA damage, and reactive oxygen species (ROS) levels in Escherichia coli cells. E. coli C600 cultures and pUC19 plasmids were exposed to a low-power pulsed (5000 Hz) infrared (904 nm) laser (1.1, 2.3, and 4.6 J). Bacterial survival was evaluated by survival fractions, bacterial proliferation was evaluated by measurement of bacterial colony areas, DNA damage was evaluated by plasmid profiling in agarose gels after electrophoresis, and ROS level was evaluated by flow cytometry. The results suggest that exposure to a low-power infrared laser in pulsed emission mode does not alter the proliferation of E. coli C600 and the electrophoretic profile of bacterial plasmids but decreases survival and increases ROS levels in E. coli C600 cultures.
{"title":"Low-power infrared laser on survival, proliferation, and reactive oxygen species levels in Escherichia coli cultures","authors":"Marisa da Cunha Sales, Giovanna de Pontes dos Santos, Ana Caroline da Silva Ferreira, Andre Luiz Mencalha, Adenilson de Souza da Fonseca","doi":"10.1088/1555-6611/ad2bfa","DOIUrl":"https://doi.org/10.1088/1555-6611/ad2bfa","url":null,"abstract":"Laser devices are light sources that emit monochromatic, coherent, and collimated electromagnetic radiation beams. Low-power lasers are widely used to treat clinical conditions based on the photobiomodulation effect. Despite therapeutic applications, mainly in continuous waves, limited data are available on photobiomodulation effects induced by low-power lasers in the pulsed emission mode. Thus, the aim of this study was to evaluate the effects of a low-power pulsed infrared laser on survival, proliferation, DNA damage, and reactive oxygen species (ROS) levels in <italic toggle=\"yes\">Escherichia coli</italic> cells. <italic toggle=\"yes\">E. coli</italic> C600 cultures and pUC19 plasmids were exposed to a low-power pulsed (5000 Hz) infrared (904 nm) laser (1.1, 2.3, and 4.6 J). Bacterial survival was evaluated by survival fractions, bacterial proliferation was evaluated by measurement of bacterial colony areas, DNA damage was evaluated by plasmid profiling in agarose gels after electrophoresis, and ROS level was evaluated by flow cytometry. The results suggest that exposure to a low-power infrared laser in pulsed emission mode does not alter the proliferation of <italic toggle=\"yes\">E. coli</italic> C600 and the electrophoretic profile of bacterial plasmids but decreases survival and increases ROS levels in <italic toggle=\"yes\">E. coli</italic> C600 cultures.","PeriodicalId":17976,"journal":{"name":"Laser Physics","volume":"159 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140315158","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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