Pub Date : 2024-02-23DOI: 10.1088/1612-202x/ad2921
Yue Cao, Naihuan Jing, Yiling Wang
This research offers a comprehensive approach to strengthening both monogamous and polygamous relationships within the context of quantum correlations in multipartite quantum systems. We present the most stringent bounds for both monogamy and polygamy in multipartite systems compared to recently established relations. We show that whenever a bound is given (named it monogamy or polygamy), our bound indexed by some parameter s will always be stronger than the given bound. The study includes detailed examples, highlighting that our findings exhibit greater strength across all existing cases in comparison.
这项研究提供了一种全面的方法，在多方量子系统的量子关联背景下加强一夫一妻和一夫多妻的关系。与最近建立的关系相比，我们提出了多方系统中一夫一妻制和一夫多妻制的最严格约束。我们证明，无论何时给出一个约束（命名为一夫一妻制或一夫多妻制），我们以某个参数 s 为索引的约束总是比给出的约束更强。研究包括详细的例子，强调了我们的发现在所有现有情况下都显示出更大的比较优势。
{"title":"Weighted monogamy and polygamy relations","authors":"Yue Cao, Naihuan Jing, Yiling Wang","doi":"10.1088/1612-202x/ad2921","DOIUrl":"https://doi.org/10.1088/1612-202x/ad2921","url":null,"abstract":"This research offers a comprehensive approach to strengthening both monogamous and polygamous relationships within the context of quantum correlations in multipartite quantum systems. We present <italic toggle=\"yes\">the most stringent</italic> bounds for both monogamy and polygamy in multipartite systems compared to recently established relations. We show that whenever a bound is given (named it monogamy or polygamy), our bound indexed by some parameter <italic toggle=\"yes\">s</italic> will always be stronger than the given bound. The study includes detailed examples, highlighting that our findings exhibit greater strength across all existing cases in comparison.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":"40 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140003117","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 : 2024-02-22DOI: 10.1088/1612-202x/ad2923
Zhen Chen, Zhi-Cheng Shi, Jie Song, Bi-Hua Huang, Yan Xia
In this paper, we put forward a scheme for flexibly preparing W states in the presence of detunings and asymmetric couplings in a nanoring-quantum-dot (nanoring-QD) system. Based on the gradient ascent pulse engineering algorithm, the coupling strength modulation (CSM) and the energy level modulation (ELM) methods are proposed, respectively. In the CSM method, the waveforms of the coupling strengths are properly designed to compensate for detunings, thus the decline on the fidelity is effectively suppressed. For the asymmetric couplings, a high-fidelity W state can be generated by the ELM method, which alters the energy levels of QDs in a desired manner. Finally, we generalize the current scheme to realize the preparation of N-particle W states in nanoring-QD systems.
本文提出了一种在纳米量子点（nanoring-QD）系统中存在失谐和非对称耦合的情况下灵活制备W态的方案。在梯度上升脉冲工程算法的基础上，分别提出了耦合强度调制（CSM）和能级调制（ELM）方法。在 CSM 方法中，耦合强度的波形经过适当设计以补偿失谐，从而有效抑制了保真度的下降。对于非对称耦合，ELM 方法可以生成高保真 W 态，从而以理想的方式改变 QD 的能级。最后，我们将目前的方案推广到纳米星-QD 系统中，实现了 N 粒子 W 态的制备。
{"title":"Flexible preparation of the W state via the GRAPE algorithm in a nanoring-quantum-dot system","authors":"Zhen Chen, Zhi-Cheng Shi, Jie Song, Bi-Hua Huang, Yan Xia","doi":"10.1088/1612-202x/ad2923","DOIUrl":"https://doi.org/10.1088/1612-202x/ad2923","url":null,"abstract":"In this paper, we put forward a scheme for flexibly preparing W states in the presence of detunings and asymmetric couplings in a nanoring-quantum-dot (nanoring-QD) system. Based on the gradient ascent pulse engineering algorithm, the coupling strength modulation (CSM) and the energy level modulation (ELM) methods are proposed, respectively. In the CSM method, the waveforms of the coupling strengths are properly designed to compensate for detunings, thus the decline on the fidelity is effectively suppressed. For the asymmetric couplings, a high-fidelity W state can be generated by the ELM method, which alters the energy levels of QDs in a desired manner. Finally, we generalize the current scheme to realize the preparation of <italic toggle=\"yes\">N</italic>-particle W states in nanoring-QD systems.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":"127 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140003121","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}
We demonstrate an all-fiber monolithic laser source from a gain-managed nonlinear (GMN) fiber amplifier with a CFBG-based pre-compressor that generates high-contrast pulses with a repetition rate of 80 MHz, average power of 1.6 W, and pulse duration of sub-50 fs. The compressed pulse quality can be optimized by tuning the parameters of the seed pulses injected into the GMN amplifier by controlling the pump power of the fiber pre-amplifier. This compact and cost-effective laser system is a simplified design of the GMN amplification-based femtosecond fiber laser systems. With alignment-free characteristics in the amplifiers and clean compressed pulses, it is easy to assemble and use in applications such as multi-photon microscopy.
{"title":"Sub-50 fs pulses generation from an all-fiber monolithic gain-managed nonlinear amplifier with CFBG-based pre-compressor","authors":"Qianglong Li, Feng Li, Hongjun Liu, Wei Zhao, Xue Cao, Hualong Zhao, Yishan Wang, Wenlong Wen, Jinhai Si","doi":"10.1088/1612-202x/ad291f","DOIUrl":"https://doi.org/10.1088/1612-202x/ad291f","url":null,"abstract":"We demonstrate an all-fiber monolithic laser source from a gain-managed nonlinear (GMN) fiber amplifier with a CFBG-based pre-compressor that generates high-contrast pulses with a repetition rate of 80 MHz, average power of 1.6 W, and pulse duration of sub-50 fs. The compressed pulse quality can be optimized by tuning the parameters of the seed pulses injected into the GMN amplifier by controlling the pump power of the fiber pre-amplifier. This compact and cost-effective laser system is a simplified design of the GMN amplification-based femtosecond fiber laser systems. With alignment-free characteristics in the amplifiers and clean compressed pulses, it is easy to assemble and use in applications such as multi-photon microscopy.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":"42 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140003205","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 : 2024-02-21DOI: 10.1088/1612-202x/ad2925
S V Sazonov
The quasi-classical dynamics of a charged particle in a weak magnetic field in the presence of dissipative losses caused by ionization of the medium is studied. The approximate approach proposed here is a generalization of the Caldirola—Kanai method for quantizing the translational motion of particles in dissipative media. It is shown that a weak curvature of a classical trajectory by the magnetic field is accompanied by an isotropic increase of uncertainty of the particle coordinates to the some maximum value at the moment the localized probability density wave packet stops. The limitation of the increase of coordinate uncertainty is due to irreversible ionization losses.
{"title":"Quasi-classical dynamics of a charged particle under conditions of ionization losses in a weak magnetic field","authors":"S V Sazonov","doi":"10.1088/1612-202x/ad2925","DOIUrl":"https://doi.org/10.1088/1612-202x/ad2925","url":null,"abstract":"The quasi-classical dynamics of a charged particle in a weak magnetic field in the presence of dissipative losses caused by ionization of the medium is studied. The approximate approach proposed here is a generalization of the Caldirola—Kanai method for quantizing the translational motion of particles in dissipative media. It is shown that a weak curvature of a classical trajectory by the magnetic field is accompanied by an isotropic increase of uncertainty of the particle coordinates to the some maximum value at the moment the localized probability density wave packet stops. The limitation of the increase of coordinate uncertainty is due to irreversible ionization losses.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":"27 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140003212","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 quench dynamics of strongly interacting bosons on quartic and sextic traps are studied by exactly solving the time-dependent many-boson Schrödinger equation numerically. The dynamics are addressed by the key measures of one-body density in conjugate space and information entropy. For both cases, rich many-body dynamics are exhibited and the loss of the Bose–Fermi oscillation in the Tonks–Girardeau limit is also attributed.
{"title":"Quench dynamics of a Tonks-Girardeau gas in one dimensional anharmonic trap","authors":"Pankaj Kumar Debnath, Barnali Chakrabarti, Mantile Leslie Lekala","doi":"10.1088/1612-202x/ad21eb","DOIUrl":"https://doi.org/10.1088/1612-202x/ad21eb","url":null,"abstract":"The quench dynamics of strongly interacting bosons on quartic and sextic traps are studied by exactly solving the time-dependent many-boson Schrödinger equation numerically. The dynamics are addressed by the key measures of one-body density in conjugate space and information entropy. For both cases, rich many-body dynamics are exhibited and the loss of the Bose–Fermi oscillation in the Tonks–Girardeau limit is also attributed.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":"10 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139757386","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 : 2024-02-07DOI: 10.1088/1612-202x/ad244a
Anh Nguyen Tuan, Thanh Thai Doan, Bang Nguyen Huy, Nga Luong Thi Yen, Dong Hoang Minh
We proposed a simple model for investigating subluminal and superluminal light propagation via an external magnetic field in an inhomogeneously broadened degenerate two-level atomic medium. We show that a magnetic field can be utilized as a knob to control the absorption/dispersion properties and group index of the medium. By changing the magnitude and reversing the direction of the magnetic field, the positive group index is converted to the negative group index at the center of the EIT window, corresponding with the propagation of a weak light pulse from subluminal to superluminal. Moreover, the influence of the Doppler broadening effect on the group index is also included, making the results approach to actual conditions. Therefore, the suggested model may be helpful for the application realization of optical storage in quantum computers and quantum information processing.
我们提出了一个简单的模型，用于研究亚光速和超光速光在不均匀拓宽的退化两级原子介质中通过外部磁场传播的情况。我们的研究表明，磁场可用作控制介质吸收/色散特性和群指数的旋钮。通过改变磁场的大小和反转磁场的方向，正群集指数会在 EIT 窗口的中心转换为负群集指数，这与微弱光脉冲从亚光速向超光速传播的过程相对应。此外，多普勒展宽效应对群集指数的影响也包括在内，从而使结果接近实际情况。因此，建议的模型可能有助于在量子计算机和量子信息处理中实现光存储的应用。
{"title":"Knob of adjusting light group velocity in an inhomogeneously broadened degenerate two-level atomic medium by a magnetic field","authors":"Anh Nguyen Tuan, Thanh Thai Doan, Bang Nguyen Huy, Nga Luong Thi Yen, Dong Hoang Minh","doi":"10.1088/1612-202x/ad244a","DOIUrl":"https://doi.org/10.1088/1612-202x/ad244a","url":null,"abstract":"We proposed a simple model for investigating subluminal and superluminal light propagation via an external magnetic field in an inhomogeneously broadened degenerate two-level atomic medium. We show that a magnetic field can be utilized as a knob to control the absorption/dispersion properties and group index of the medium. By changing the magnitude and reversing the direction of the magnetic field, the positive group index is converted to the negative group index at the center of the EIT window, corresponding with the propagation of a weak light pulse from subluminal to superluminal. Moreover, the influence of the Doppler broadening effect on the group index is also included, making the results approach to actual conditions. Therefore, the suggested model may be helpful for the application realization of optical storage in quantum computers and quantum information processing.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":"4 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139757388","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 : 2024-02-01DOI: 10.1088/1612-202x/ad21ed
D A Gorlova, I N Tsymbalov, I P Tsygvintsev, A B Savelev
Direct laser electron acceleration in near-critical density plasma produces collimated electron beams with high charge Q (up to µC). This regime could be of interest for high-energy THz radiation generation, as many of the mechanisms have a scaling ∝Q2. In this work, we focus specifically on the challenges that arise during numerical investigations of transition radiation in such interactions. Detailed analytical calculations that include both the diffraction and decoherence effects of the characteristics of transition radiation in the THz range were conducted with the input parameters obtained from 3D particle-in-cell and hydrodynamic simulations. The calculated characteristics of THz radiation are in good agreement with the experimentally measured ones. Therefore, this approach can be used both to optimize the properties of THz radiation and to distinguish the transition radiation contribution if several mechanisms of THz radiation generation are considered.
{"title":"THz transition radiation of electron bunches laser-accelerated in long-scale near-critical-density plasmas","authors":"D A Gorlova, I N Tsymbalov, I P Tsygvintsev, A B Savelev","doi":"10.1088/1612-202x/ad21ed","DOIUrl":"https://doi.org/10.1088/1612-202x/ad21ed","url":null,"abstract":"Direct laser electron acceleration in near-critical density plasma produces collimated electron beams with high charge <italic toggle=\"yes\">Q</italic> (up to <italic toggle=\"yes\">µ</italic>C). This regime could be of interest for high-energy THz radiation generation, as many of the mechanisms have a scaling <inline-formula>\u0000<tex-math><?CDATA $propto Q^2$?></tex-math>\u0000<mml:math overflow=\"scroll\"><mml:mo>∝</mml:mo><mml:msup><mml:mi>Q</mml:mi><mml:mn>2</mml:mn></mml:msup></mml:math>\u0000<inline-graphic xlink:href=\"lplad21edieqn1.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>. In this work, we focus specifically on the challenges that arise during numerical investigations of transition radiation in such interactions. Detailed analytical calculations that include both the diffraction and decoherence effects of the characteristics of transition radiation in the THz range were conducted with the input parameters obtained from 3D particle-in-cell and hydrodynamic simulations. The calculated characteristics of THz radiation are in good agreement with the experimentally measured ones. Therefore, this approach can be used both to optimize the properties of THz radiation and to distinguish the transition radiation contribution if several mechanisms of THz radiation generation are considered.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":"110 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139757569","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 : 2024-01-29DOI: 10.1088/1612-202x/ad1f4f
G P Liu, P H Mu, G Guo, X T Liu, G S Hu
In this paper, a novel method is proposed to generate high-quality chaotic signals using three cascade-coupled nano-lasers (NLs), and generate high-speed, high-quality random number sequences. The master NL (MNL) is subjected to optical feedback, and its output is injected into the intermediate NL (INL), which is further injected into the slave NL (SNL). In the simulation, we first adjust proper parameters so that the SNL generates a chaotic signal with a large bandwidth and time-delay signature concealment. After performing self-delayed differential processing on the chaotic signal, and utilizing an 8-bit analog-to-digital converter for sampling and quantization, followed by extraction of the m-bits least significant bit, the final random bit sequence is obtained. Finally, we use NIST SP 800-22 to test the generated random numbers. The results demonstrate that the obtained random number sequence successfully passed all tests specified by NIST SP 800-22.
{"title":"High-quality random bit generation based on a cascade-coupled nano-laser system","authors":"G P Liu, P H Mu, G Guo, X T Liu, G S Hu","doi":"10.1088/1612-202x/ad1f4f","DOIUrl":"https://doi.org/10.1088/1612-202x/ad1f4f","url":null,"abstract":"In this paper, a novel method is proposed to generate high-quality chaotic signals using three cascade-coupled nano-lasers (NLs), and generate high-speed, high-quality random number sequences. The master NL (MNL) is subjected to optical feedback, and its output is injected into the intermediate NL (INL), which is further injected into the slave NL (SNL). In the simulation, we first adjust proper parameters so that the SNL generates a chaotic signal with a large bandwidth and time-delay signature concealment. After performing self-delayed differential processing on the chaotic signal, and utilizing an 8-bit analog-to-digital converter for sampling and quantization, followed by extraction of the m-bits least significant bit, the final random bit sequence is obtained. Finally, we use NIST SP 800-22 to test the generated random numbers. The results demonstrate that the obtained random number sequence successfully passed all tests specified by NIST SP 800-22.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":"2 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139757579","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 : 2024-01-19DOI: 10.1088/1612-202x/ad1aa4
D A Kurakina, M Yu Kirillin, A V Khilov, V V Perekatova
We developed a novel machine-learning-based algorithm based on a gradient boosting regressor for three-dimensional pixel-by-pixel mapping of blood oxygen saturation based on dual-wavelength optoacoustic data. Algorithm training was performed on in silico data produced from Monte-Carlo-generated absorbed light energy distributions in tissue-like vascularized media for probing wavelengths of 532 and 1064 nm and the empirical instrumental function of the optoacoustic imaging setup with further validation of the independent in silico data. In vivo optoacoustic data for rabbit-ear vasculature was employed as a testing dataset. The developed algorithm allowed in vivo blood oxygen saturation mapping and showed clear differences in blood oxygen saturation values in veins at 15 °C and 43 °C due to functional arteriovenous anastomoses. These results indicated that dual-wavelength optoacoustic imaging could serve as a cost-effective alternative to complicated multiwavelength quantitative optoacoustic imaging.
{"title":"Machine-learning-based mapping of blood oxygen saturation from dual-wavelength optoacoustic measurements","authors":"D A Kurakina, M Yu Kirillin, A V Khilov, V V Perekatova","doi":"10.1088/1612-202x/ad1aa4","DOIUrl":"https://doi.org/10.1088/1612-202x/ad1aa4","url":null,"abstract":"We developed a novel machine-learning-based algorithm based on a gradient boosting regressor for three-dimensional pixel-by-pixel mapping of blood oxygen saturation based on dual-wavelength optoacoustic data. Algorithm training was performed on <italic toggle=\"yes\">in silico</italic> data produced from Monte-Carlo-generated absorbed light energy distributions in tissue-like vascularized media for probing wavelengths of 532 and 1064 nm and the empirical instrumental function of the optoacoustic imaging setup with further validation of the independent <italic toggle=\"yes\">in silico</italic> data. <italic toggle=\"yes\">In vivo</italic> optoacoustic data for rabbit-ear vasculature was employed as a testing dataset. The developed algorithm allowed <italic toggle=\"yes\">in vivo</italic> blood oxygen saturation mapping and showed clear differences in blood oxygen saturation values in veins at 15 °C and 43 °C due to functional arteriovenous anastomoses. These results indicated that dual-wavelength optoacoustic imaging could serve as a cost-effective alternative to complicated multiwavelength quantitative optoacoustic imaging.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":"90 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139510160","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 : 2024-01-18DOI: 10.1088/1612-202x/ad1aa9
V M Gelikonov, M A Novikov
The features of high-sensitivity frequency and phase measurements in a He–Ne gas laser at a wavelength of 0.63 μm are considered. The single-frequency mode of this laser with a large excess of the lasing threshold is implemented due to longitudinal mode selection using an ultra-thin nickel metal film placed in the standing field node of the cavity. With such an excess of the lasing threshold, the natural linewidth component is very small (∼10−3Hz), which was determined from the heterodyne method of measuring natural fluctuations of lasing frequency. This method can be used in combination with the multibeam intracavity interferometry for measuring phase modulation at a level of 10−9 rad Hz−1/2. To demonstrate the capabilities of the method, the electro-optical Kerr effect in air at atmospheric pressure in linearly polarized light was studied separately for extraordinary and ordinary waves. The Kerr and the Havelock constants were measured. A deviation from a purely quadratic dependence determined by the fourth power of the amplitude of a low-frequency electric field was found. A possible explanation of the detected deviation from the Kerr effect is the electrostriction.
研究了波长为 0.63 μm 的氦氖气体激光器的高灵敏度频率和相位测量特性。由于在腔体的驻场节点上放置了一层超薄镍金属膜进行纵向模式选择，因此该激光器的单频模式超出了很大的激光阈值。根据测量激光频率自然波动的外差法测定，在这种超过激光阈值的情况下，自然线宽分量非常小（∼10-3Hz）。这种方法可与多波束腔内干涉测量法结合使用，测量 10-9 rad Hz-1/2 水平的相位调制。为了证明该方法的能力，我们分别研究了大气压下线性偏振光在空气中的非凡波和普通波的电光克尔效应。测量了克尔常数和哈维洛克常数。结果发现，与由低频电场振幅的四次方决定的纯粹二次方关系存在偏差。对检测到的克尔效应偏差的一种可能解释是电致伸缩。
{"title":"Intracavity heterodyne laser interferometry. Studies of the features of optical Kerr effect in the atmosphere","authors":"V M Gelikonov, M A Novikov","doi":"10.1088/1612-202x/ad1aa9","DOIUrl":"https://doi.org/10.1088/1612-202x/ad1aa9","url":null,"abstract":"The features of high-sensitivity frequency and phase measurements in a He–Ne gas laser at a wavelength of 0.63 <italic toggle=\"yes\">μ</italic>m are considered. The single-frequency mode of this laser with a large excess of the lasing threshold is implemented due to longitudinal mode selection using an ultra-thin nickel metal film placed in the standing field node of the cavity. With such an excess of the lasing threshold, the natural linewidth component is very small (∼10<sup>−3</sup>Hz), which was determined from the heterodyne method of measuring natural fluctuations of lasing frequency. This method can be used in combination with the multibeam intracavity interferometry for measuring phase modulation at a level of 10<sup>−9</sup> rad Hz<sup>−1/2</sup>. To demonstrate the capabilities of the method, the electro-optical Kerr effect in air at atmospheric pressure in linearly polarized light was studied separately for extraordinary and ordinary waves. The Kerr and the Havelock constants were measured. A deviation from a purely quadratic dependence determined by the fourth power of the amplitude of a low-frequency electric field was found. A possible explanation of the detected deviation from the Kerr effect is the electrostriction.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":"29 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139508180","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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