Pub Date : 2019-10-17DOI: 10.1109/CLEOE-EQEC.2019.8872611
Xiaomeng Liu, Matthijs Jansen, A. D. de Beurs, K. Eikema, S. Witte
High-harmonic generation (HHG) sources are becoming a mature table-top source of coherent extreme-ultraviolet (XUV) and soft-X-ray radiation, and are being used in many applications such as time-resolved spectroscopy, nanoscale imaging and even nonlinear XUV optics. For many such applications, accurate knowledge of the wavefront is important to correctly interpret experimental results. While several solutions exist to measure wavefronts for visible and XUV radiation [1,2], HHG sources pose a specific challenge because of their intrinsically ultra-broadband spectral widths, combined with often significant pulse-to-pulse variability because of the highly nonlinear generation mechanism. Therefore, an HHG wavefront sensor should ideally provide both spectral resolution and single-shot measurement capability.
{"title":"A Spectrally Resolved Single-Shot Wavefront Sensor for Broadband High-Harmonic Generation Sources","authors":"Xiaomeng Liu, Matthijs Jansen, A. D. de Beurs, K. Eikema, S. Witte","doi":"10.1109/CLEOE-EQEC.2019.8872611","DOIUrl":"https://doi.org/10.1109/CLEOE-EQEC.2019.8872611","url":null,"abstract":"High-harmonic generation (HHG) sources are becoming a mature table-top source of coherent extreme-ultraviolet (XUV) and soft-X-ray radiation, and are being used in many applications such as time-resolved spectroscopy, nanoscale imaging and even nonlinear XUV optics. For many such applications, accurate knowledge of the wavefront is important to correctly interpret experimental results. While several solutions exist to measure wavefronts for visible and XUV radiation [1,2], HHG sources pose a specific challenge because of their intrinsically ultra-broadband spectral widths, combined with often significant pulse-to-pulse variability because of the highly nonlinear generation mechanism. Therefore, an HHG wavefront sensor should ideally provide both spectral resolution and single-shot measurement capability.","PeriodicalId":6714,"journal":{"name":"2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)","volume":"54 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2019-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73321302","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-10-17DOI: 10.1109/CLEOE-EQEC.2019.8873192
I. Vatnik, O. Gorbunov, S. Sugavanam, D. Churkin, E. Podivilov
Spectral correlations in fiber lasers attract a lot of attention during the last decade. Being formed due to fundamental interactions of light propagating through the cavity, they directly influence the general radiation statistical properties. In particular, study of inner correlations may reveal the physics of generation of radiation in random distributed feedback laser (RDFL).
{"title":"Spectral Correlations in Radiation of Random Distributed Feedback Raman Fiber Laser","authors":"I. Vatnik, O. Gorbunov, S. Sugavanam, D. Churkin, E. Podivilov","doi":"10.1109/CLEOE-EQEC.2019.8873192","DOIUrl":"https://doi.org/10.1109/CLEOE-EQEC.2019.8873192","url":null,"abstract":"Spectral correlations in fiber lasers attract a lot of attention during the last decade. Being formed due to fundamental interactions of light propagating through the cavity, they directly influence the general radiation statistical properties. In particular, study of inner correlations may reveal the physics of generation of radiation in random distributed feedback laser (RDFL).","PeriodicalId":6714,"journal":{"name":"2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)","volume":"42 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2019-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73846717","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-10-17DOI: 10.1109/CLEOE-EQEC.2019.8872393
K. Litvinova, M. Chernysheva, I. Kudelin, S. Khalimanenko, F. Leyva
Laser tissue welding (LTW) uses laser energy to anastomose tissues and is ideally suited for applications in which suturing and stapling is difficult. The advantages of LTW compared with traditional methods of wound closure are the absence of foreign body reaction and less scar formation. The objective of this study was to determine whether a dissected heart walls could be welded by 1550 nm laser using an in vitro chicken hearts dissection model.
{"title":"Experimental Evaluation of Pulse 1550 Nm Laser System for Welding of Heart Tissue","authors":"K. Litvinova, M. Chernysheva, I. Kudelin, S. Khalimanenko, F. Leyva","doi":"10.1109/CLEOE-EQEC.2019.8872393","DOIUrl":"https://doi.org/10.1109/CLEOE-EQEC.2019.8872393","url":null,"abstract":"Laser tissue welding (LTW) uses laser energy to anastomose tissues and is ideally suited for applications in which suturing and stapling is difficult. The advantages of LTW compared with traditional methods of wound closure are the absence of foreign body reaction and less scar formation. The objective of this study was to determine whether a dissected heart walls could be welded by 1550 nm laser using an in vitro chicken hearts dissection model.","PeriodicalId":6714,"journal":{"name":"2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)","volume":"35 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2019-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82065355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-10-17DOI: 10.1109/CLEOE-EQEC.2019.8872156
A. Forrest, M. Krakowski, P. Bardella, M. Cataluna
Superluminescent diodes (SLDs) with high power spectral density present an appealing low cost, small footprint and relatively simple alternative to supercontinuum sources for spectroscopy applications that do not require extremely broad optical spectra1. Numerous approaches have been used to optimise the performance of SLDs in this respect. Here, we present a superluminescent diode under CW operation with a record-high power spectral density owing to its chirped quantum-dot active region, two-section contact layout and long tapered waveguide geometry.
{"title":"Record-High Power Spectral Density CW Tapered Quantum-Dot Superluminescent Diode","authors":"A. Forrest, M. Krakowski, P. Bardella, M. Cataluna","doi":"10.1109/CLEOE-EQEC.2019.8872156","DOIUrl":"https://doi.org/10.1109/CLEOE-EQEC.2019.8872156","url":null,"abstract":"Superluminescent diodes (SLDs) with high power spectral density present an appealing low cost, small footprint and relatively simple alternative to supercontinuum sources for spectroscopy applications that do not require extremely broad optical spectra1. Numerous approaches have been used to optimise the performance of SLDs in this respect. Here, we present a superluminescent diode under CW operation with a record-high power spectral density owing to its chirped quantum-dot active region, two-section contact layout and long tapered waveguide geometry.","PeriodicalId":6714,"journal":{"name":"2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)","volume":"104 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2019-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79212070","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-10-17DOI: 10.1109/CLEOE-EQEC.2019.8872172
F. Saltarelli, A. Diebold, I. Graumann, C. Phillips, U. Keller
Ultrafast high-power laser sources have a crucial role in science and industry. One way to reach performance in the multi-100-W average output power with sub-ps, tens-of-mJ pulses is through thin-disk laser (TDL) oscillators [1]. The oscillator approach to high power, compared to amplifier systems, offers superior beam quality and reduced system complexity but comes at the expense of a challenging nonlinearity management and a high sensitivity to thermal lensing. In particular, the MW-level intracavity peak power leads to a large amount of self-phase modulation (SPM) picked up in the intracavity air. The SPM needs to be compensated with negative group-delay dispersion (GDD) to ensure stable soliton pulse formation. Hence, there is a trade-off in GDD versus pulse energy for TDLs operated in air ("Standard TDLs" in Fig. 1a). Dispersive mirrors can provide the required GDD but, due to their resonant structure, they are more subject to thermal effects and damage compared to standard dielectric mirrors. A workaround is to operate the TDL in vacuum ("Vacuum TDLs" in Fig. 1a).
{"title":"Overcoming the Challenges in Power Scaling Ultrafast Thin-Disk Oscillators: Nonlinearity Management and Thermal Effects","authors":"F. Saltarelli, A. Diebold, I. Graumann, C. Phillips, U. Keller","doi":"10.1109/CLEOE-EQEC.2019.8872172","DOIUrl":"https://doi.org/10.1109/CLEOE-EQEC.2019.8872172","url":null,"abstract":"Ultrafast high-power laser sources have a crucial role in science and industry. One way to reach performance in the multi-100-W average output power with sub-ps, tens-of-mJ pulses is through thin-disk laser (TDL) oscillators [1]. The oscillator approach to high power, compared to amplifier systems, offers superior beam quality and reduced system complexity but comes at the expense of a challenging nonlinearity management and a high sensitivity to thermal lensing. In particular, the MW-level intracavity peak power leads to a large amount of self-phase modulation (SPM) picked up in the intracavity air. The SPM needs to be compensated with negative group-delay dispersion (GDD) to ensure stable soliton pulse formation. Hence, there is a trade-off in GDD versus pulse energy for TDLs operated in air (\"Standard TDLs\" in Fig. 1a). Dispersive mirrors can provide the required GDD but, due to their resonant structure, they are more subject to thermal effects and damage compared to standard dielectric mirrors. A workaround is to operate the TDL in vacuum (\"Vacuum TDLs\" in Fig. 1a).","PeriodicalId":6714,"journal":{"name":"2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)","volume":"8 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2019-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90603227","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-10-17DOI: 10.1109/CLEOE-EQEC.2019.8873004
A. S. Schulz, D. Grishina, C. A. M. Harteveid, A. Pacureanu, A. Lagendijk, J. Huskens, G. Vancso, P. Cloetens, W. Vos
It is a major outstanding goal in Nanophotonics to precisely place quantum emitters inside a three-dimensional (3D) metamaterial. It is well-known that such control offers exquisite control over cavity QED, spontaneous and stimulated emission, and even non-linear optics [1]. Theory predicts that the emission of an emitter, e.g. a quantum dot, varies spatially on 100s nm scale [2]. Thus, the challenge is to place emitters with a precision better than Δx < 100 nm. We present our newly developed chemical toolbox to fix the positions of quantum dots with a polymer brush layer with thicknesses in the 10s nm range in silicon nanostructures [3].
{"title":"Placing Quantum Dots in 3D Photonic Crystals and Finding Them Back","authors":"A. S. Schulz, D. Grishina, C. A. M. Harteveid, A. Pacureanu, A. Lagendijk, J. Huskens, G. Vancso, P. Cloetens, W. Vos","doi":"10.1109/CLEOE-EQEC.2019.8873004","DOIUrl":"https://doi.org/10.1109/CLEOE-EQEC.2019.8873004","url":null,"abstract":"It is a major outstanding goal in Nanophotonics to precisely place quantum emitters inside a three-dimensional (3D) metamaterial. It is well-known that such control offers exquisite control over cavity QED, spontaneous and stimulated emission, and even non-linear optics [1]. Theory predicts that the emission of an emitter, e.g. a quantum dot, varies spatially on 100s nm scale [2]. Thus, the challenge is to place emitters with a precision better than Δx < 100 nm. We present our newly developed chemical toolbox to fix the positions of quantum dots with a polymer brush layer with thicknesses in the 10s nm range in silicon nanostructures [3].","PeriodicalId":6714,"journal":{"name":"2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)","volume":"115 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2019-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86059072","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-10-17DOI: 10.1109/cleoe-eqec.2019.8872358
Yutong Feng, C. Codemard, P. Barua, H. Lin, Sheng Zhu, Yujun Feng, S. Pidishety, Soonki Hong, J. Sahu, J. Nilsson
Photodarkening (PD) can degrade the output power and increase the thermal load in Yb-doped fiber lasers and amplifiers by increasing the propagation loss in the core [1,2]. PD can be attributed to color centers [3] and is reported to grow when the fiber is in use, over times from a few minutes to many hours (e.g., [2–4]). Typically, this is characterized in terms of a reduced output power of the operating device, but it is also possible to measure the transmission with non-resonant optical probes before, during, and after use. Although faster changes in the photodarkening are also possible [3], they have received little attention. Such fast changes can affect both the impact and the characterization of photodarkening.
{"title":"Time Response Characteristics of Photodarkening-Induced Loss in Yb-Doped Fiber Amplifier","authors":"Yutong Feng, C. Codemard, P. Barua, H. Lin, Sheng Zhu, Yujun Feng, S. Pidishety, Soonki Hong, J. Sahu, J. Nilsson","doi":"10.1109/cleoe-eqec.2019.8872358","DOIUrl":"https://doi.org/10.1109/cleoe-eqec.2019.8872358","url":null,"abstract":"Photodarkening (PD) can degrade the output power and increase the thermal load in Yb-doped fiber lasers and amplifiers by increasing the propagation loss in the core [1,2]. PD can be attributed to color centers [3] and is reported to grow when the fiber is in use, over times from a few minutes to many hours (e.g., [2–4]). Typically, this is characterized in terms of a reduced output power of the operating device, but it is also possible to measure the transmission with non-resonant optical probes before, during, and after use. Although faster changes in the photodarkening are also possible [3], they have received little attention. Such fast changes can affect both the impact and the characterization of photodarkening.","PeriodicalId":6714,"journal":{"name":"2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)","volume":"22 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2019-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90666001","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-10-17DOI: 10.1109/CLEOE-EQEC.2019.8873050
D. Dvoretskiy, S. Sazonkin, I. O. Orekhov, I. Kudelin, A. Pnev, V. Karasik, L. K. Denisov
Mode-locked (ML) ultrashort pulse (USP) fiber lasers can be treated as an ideal platform to expand future applications due to a complex nonlinear dynamics with a presence of a high value of a group velocity dispersion and a third-order dispersion in the laser resonator. Up to now a series of novel ML regimes have been investigated e.g. self-similar pulses, noise-like pulses, multi-bound solitons, and a soliton rain generation. Multi-bound solitons (MBS) generation regime, also known as soliton molecules, is of considerable interest in various fields of applications. For example, the investigation of a MBS generation is very attractive for increasing the data transfer capacity in telecommunications due to coding alphabet extension. The coding concept of MBS suggests a data stream using more than two symbols (2·N symbols, where N is the number of generated solitons in a bound state) [1]. And also, recent research shows that using ultrafast bursts of pulses can improve the quality of laser ablation for medical applications [2]. Moreover, MB S generation can be also used in a coherent pulse staking amplification scheme increasing an amplification efficiency along with a formation of high-energy solitons at a high-repetition-rate [3].
{"title":"Controllable Generation of Ultrashort Multi-Bound Solitons in a Mode-Locked Erbium-Doped Ring Laser with a Highly-Nonlinear Resonator","authors":"D. Dvoretskiy, S. Sazonkin, I. O. Orekhov, I. Kudelin, A. Pnev, V. Karasik, L. K. Denisov","doi":"10.1109/CLEOE-EQEC.2019.8873050","DOIUrl":"https://doi.org/10.1109/CLEOE-EQEC.2019.8873050","url":null,"abstract":"Mode-locked (ML) ultrashort pulse (USP) fiber lasers can be treated as an ideal platform to expand future applications due to a complex nonlinear dynamics with a presence of a high value of a group velocity dispersion and a third-order dispersion in the laser resonator. Up to now a series of novel ML regimes have been investigated e.g. self-similar pulses, noise-like pulses, multi-bound solitons, and a soliton rain generation. Multi-bound solitons (MBS) generation regime, also known as soliton molecules, is of considerable interest in various fields of applications. For example, the investigation of a MBS generation is very attractive for increasing the data transfer capacity in telecommunications due to coding alphabet extension. The coding concept of MBS suggests a data stream using more than two symbols (2·N symbols, where N is the number of generated solitons in a bound state) [1]. And also, recent research shows that using ultrafast bursts of pulses can improve the quality of laser ablation for medical applications [2]. Moreover, MB S generation can be also used in a coherent pulse staking amplification scheme increasing an amplification efficiency along with a formation of high-energy solitons at a high-repetition-rate [3].","PeriodicalId":6714,"journal":{"name":"2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)","volume":"1 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2019-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89420605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-10-17DOI: 10.1109/CLEOE-EQEC.2019.8872360
M. Saleh
Quasi-phase-matching periodically-tapered waveguides (PTWs) can enable efficient on-demand third-order parametric interactions using right combinations of the tapering period and modulation amplitude [1]. Similar to periodically-poled ferroelectric crystals, this new technique eliminates the stringent constraints imposed by conventional methods on the frequencies, mode profiles, and polarisations of the interacting photons. An example of PTWs is the sinusoidally-tapered fibres that have been exploited in manuiplating supercontinuum generation and modulation instability [2]. In this work, I have developed a rigorous quantum model to investigate spontaneous four-wave mixing (SFWM) inside these tapered waveguides [3]. The right combinations between the modulation amplitude Δd and tapering period ΛT that enhances the expected number of photons (Ns) at the targeted wavelengths are portrayed in Fig. 1(a), for fibres with same number of periods M. The values of (Ns) are normalised to the case when Δd = 0, to quantify the enhancement in photon-pairs generation using the PTW-technique in comparison to uniform fibres. For only M = 50, (NVs) is remarkably enhanced by 35 dB. The output spectrum of the photon-pairs is featured as a narrow sinc-function with very weak sidelobes that are significantly diminished for large number of periods, as depicted in Fig. 1(b). The 2D representation of the spectrum as a function of the photon-pairs wavelengths (λs, λi) is shown in panel (c). In this plot, the pump is assumed to be a monochromatic at a frequency satisfies the energy conservation. The corresponding (Ns) for a Gaussian-pulse pump source with an input energy 1 nJ and a full-width-half-maximum 4 ps is portrayed in Fig. 1(d). Using the Schmidt decomposition analysis, the spectral-purity is 0.74. This shows the ability of the PTW-technique in producing highly-efficient relatively-pure single photons at any on-demand frequencies without applying any bandpass filters. This work will also open a new direction of research to investigate how the tapering patterns can be fully optimised to tailor the spectral properties of the output photons in third-order nonlinear guided structures.
{"title":"Tailored Spontaneous Four-Wave Mixing in Sinusoidally-Tapered Fibres","authors":"M. Saleh","doi":"10.1109/CLEOE-EQEC.2019.8872360","DOIUrl":"https://doi.org/10.1109/CLEOE-EQEC.2019.8872360","url":null,"abstract":"Quasi-phase-matching periodically-tapered waveguides (PTWs) can enable efficient on-demand third-order parametric interactions using right combinations of the tapering period and modulation amplitude [1]. Similar to periodically-poled ferroelectric crystals, this new technique eliminates the stringent constraints imposed by conventional methods on the frequencies, mode profiles, and polarisations of the interacting photons. An example of PTWs is the sinusoidally-tapered fibres that have been exploited in manuiplating supercontinuum generation and modulation instability [2]. In this work, I have developed a rigorous quantum model to investigate spontaneous four-wave mixing (SFWM) inside these tapered waveguides [3]. The right combinations between the modulation amplitude Δd and tapering period ΛT that enhances the expected number of photons (Ns) at the targeted wavelengths are portrayed in Fig. 1(a), for fibres with same number of periods M. The values of (Ns) are normalised to the case when Δd = 0, to quantify the enhancement in photon-pairs generation using the PTW-technique in comparison to uniform fibres. For only M = 50, (NVs) is remarkably enhanced by 35 dB. The output spectrum of the photon-pairs is featured as a narrow sinc-function with very weak sidelobes that are significantly diminished for large number of periods, as depicted in Fig. 1(b). The 2D representation of the spectrum as a function of the photon-pairs wavelengths (λs, λi) is shown in panel (c). In this plot, the pump is assumed to be a monochromatic at a frequency satisfies the energy conservation. The corresponding (Ns) for a Gaussian-pulse pump source with an input energy 1 nJ and a full-width-half-maximum 4 ps is portrayed in Fig. 1(d). Using the Schmidt decomposition analysis, the spectral-purity is 0.74. This shows the ability of the PTW-technique in producing highly-efficient relatively-pure single photons at any on-demand frequencies without applying any bandpass filters. This work will also open a new direction of research to investigate how the tapering patterns can be fully optimised to tailor the spectral properties of the output photons in third-order nonlinear guided structures.","PeriodicalId":6714,"journal":{"name":"2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)","volume":"3 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2019-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87602613","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-10-17DOI: 10.1109/cleoe-eqec.2019.8872992
A. Kuznetsov, I. Vatnik, A. Perego, D. Churkin, K. Staliūnas
Mode-locking (ML) is an established technique used to generate high power, ultrashort (ranging from ps to few fs duration) coherent light pulses in lasers. Mode-locking techniques could be classified into two broad categories. First one is passive mode-locking techniques in which modes are locked through dynamical intracavity self-organization processes not requiring extra energy sources. Another one is active mode-locking where locking between cavity modes is induced by external energy source. Active mode-locking could be either amplitude mode-locking (AML), for example achieved by a periodic (in time) modulation of the loss coefficient, or phase mode-locking (PML), for example via periodical modulation of the length/detuning of the cavity. In amplitude mode-locking periodic forcing induces synchronization of the cavity modes symmetrically coupled to the closest neighbors due to the action of the modulator: the spectrum broadens symmetrically, resulting in coherent frequency comb centered at the middle of the gain line, see Fig.1a.
{"title":"Experimental Evidences of Non-Hermitian Mode-Locking in Fibre Laser","authors":"A. Kuznetsov, I. Vatnik, A. Perego, D. Churkin, K. Staliūnas","doi":"10.1109/cleoe-eqec.2019.8872992","DOIUrl":"https://doi.org/10.1109/cleoe-eqec.2019.8872992","url":null,"abstract":"Mode-locking (ML) is an established technique used to generate high power, ultrashort (ranging from ps to few fs duration) coherent light pulses in lasers. Mode-locking techniques could be classified into two broad categories. First one is passive mode-locking techniques in which modes are locked through dynamical intracavity self-organization processes not requiring extra energy sources. Another one is active mode-locking where locking between cavity modes is induced by external energy source. Active mode-locking could be either amplitude mode-locking (AML), for example achieved by a periodic (in time) modulation of the loss coefficient, or phase mode-locking (PML), for example via periodical modulation of the length/detuning of the cavity. In amplitude mode-locking periodic forcing induces synchronization of the cavity modes symmetrically coupled to the closest neighbors due to the action of the modulator: the spectrum broadens symmetrically, resulting in coherent frequency comb centered at the middle of the gain line, see Fig.1a.","PeriodicalId":6714,"journal":{"name":"2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)","volume":"26 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2019-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85724599","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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