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Laser frequency stabilization for continuous-wave laser enhanced direct frequency comb spectroscopy system 用于连续波激光增强型直接频率梳光谱系统的激光稳频技术
IF 1.2 4区 物理与天体物理
Laser Physics Pub Date : 2024-05-27 DOI: 10.1088/1555-6611/ad4bb1
Yichi Zhang and Hongyan Fan
{"title":"Laser frequency stabilization for continuous-wave laser enhanced direct frequency comb spectroscopy system","authors":"Yichi Zhang and Hongyan Fan","doi":"10.1088/1555-6611/ad4bb1","DOIUrl":"https://doi.org/10.1088/1555-6611/ad4bb1","url":null,"abstract":"We present the observation of high-precision direct frequency comb spectroscopy excited by an optical frequency comb and a diode laser when each of them drives one step of the two-photon transition in a rubidium vapor system. We demonstrate a stable and low noise system by directly locking the frequency of the continuous-wave laser to the rubidium two-photon transition. The frequency stability of a diode laser via the two-photon transition locking technique is 8 × 10−11 for a 1 s gate time and 3 × 10−12 for 1000 s. It proves to be a potential technique for locking the diode laser with high stability. We chose a suitable optical frequency comb pulse and the frequency of the diode laser to fulfill the double-resonance condition. These techniques eliminate spectrum line overlap and would benefit spectroscopy measurements.","PeriodicalId":17976,"journal":{"name":"Laser Physics","volume":"27 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141173202","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}
引用次数: 0
High power single crystal KTA optical parametric amplifier for efficient 1.4–3.5 µm mid-IR radiation generation 用于高效产生 1.4-3.5 µm 中红外辐射的高功率单晶 KTA 光参量放大器
IF 1.2 4区 物理与天体物理
Laser Physics Pub Date : 2024-05-21 DOI: 10.1088/1555-6611/ad45db
Bianka Csanaková, Ondřej Novák, Lukáš Roškot, Jiří Mužík, Martin Smrž, Helena Jelínková and Tomáš Mocek
{"title":"High power single crystal KTA optical parametric amplifier for efficient 1.4–3.5 µm mid-IR radiation generation","authors":"Bianka Csanaková, Ondřej Novák, Lukáš Roškot, Jiří Mužík, Martin Smrž, Helena Jelínková and Tomáš Mocek","doi":"10.1088/1555-6611/ad45db","DOIUrl":"https://doi.org/10.1088/1555-6611/ad45db","url":null,"abstract":"In this paper, we present a single crystal, KTA (potassium titanyl-arsenate, KTiOAsO4) based picosecond optical parametric amplifier pumped by an in-house built 1030 nm Yb:YAG thin-disk laser, capable of tunability from 1.46 to 3.5 µm, operating at 90 kHz, with high average power in the signal and idler beams. The highest output power of 8.9 W was reached for the 1750 nm signal beam with 19% conversion efficiency and the respective 2500 nm idler beam power was 6.2 W with 13% efficiency. The highest combined signal and idler mid-infrared power was 17 W at the 2060 nm wavelength degeneracy point.","PeriodicalId":17976,"journal":{"name":"Laser Physics","volume":"42 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141152666","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}
引用次数: 0
On the distribution function of electron spectra from hot laser plasmas 关于热激光等离子体电子能谱的分布函数
IF 1.2 4区 物理与天体物理
Laser Physics Pub Date : 2024-05-10 DOI: 10.1088/1555-6611/ad45dd
Rolf Behrens
{"title":"On the distribution function of electron spectra from hot laser plasmas","authors":"Rolf Behrens","doi":"10.1088/1555-6611/ad45dd","DOIUrl":"https://doi.org/10.1088/1555-6611/ad45dd","url":null,"abstract":"The emission of electrons from hot plasmas generated in the interaction of ultra-short (and ultra-high intensity) laser pulses with matter is often characterized by the so-called ‘hot electron temperature’. In this article it is shown that this number is not unambiguous. The reason is the following: to assign a temperature to an electron spectrum, it is necessary to describe the spectrum with a distribution function. However, different types of distribution functions are in use, e.g. the Boltzmann or Maxwell distribution, leading to different electron temperatures in spite of providing nearly the same form of the electron spectrum. For this reason, the main characteristics of all these distribution functions are presented in this article and compared. Depending on the distribution function used, the value of the hot electron temperature varies by up to 30% and in extreme cases by more than a factor of four. This fact should always be kept in mind when comparing values of hot electron temperatures. In addition, the reasons for using equilibrium distributions to describe the characteristics of laser-produced electrons—although probably no thermodynamic equilibrium is prevailing—are discussed.","PeriodicalId":17976,"journal":{"name":"Laser Physics","volume":"45 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140937262","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}
引用次数: 0
Electromagnetically induced gratings created by extremely short non-overlapping pulses of light in a three-level resonant medium 三电平共振介质中的极短非重叠光脉冲产生的电磁诱导光栅
IF 1.2 4区 物理与天体物理
Laser Physics Pub Date : 2024-05-02 DOI: 10.1088/1555-6611/ad3ae6
Rostislav Arkhipov
{"title":"Electromagnetically induced gratings created by extremely short non-overlapping pulses of light in a three-level resonant medium","authors":"Rostislav Arkhipov","doi":"10.1088/1555-6611/ad3ae6","DOIUrl":"https://doi.org/10.1088/1555-6611/ad3ae6","url":null,"abstract":"In a fixed spectral range, single- and half-cycle electromagnetic pulses have the shortest duration. Half-cycle pulses are promising tools for ultrafast control of quantum systems. Previously, the possibility of using a sequence of single- and half-cycle attosecond pulses to generate and ultrafast control light-induced population difference gratings has been demonstrated. However, such studies have been carried out using different approximations, such as the sudden perturbation theory and the two-level model for the resonant medium. In this paper, based on the numerical solution of constitutive equations for elements of the density matrix and wave equation it is shown that it is possible to generate and control population gratings in a three-level medium without using the approximation of sudden perturbations used in previous studies. It is shown that taking into account the additional level of the medium does not lead to a violation of the effect of generating such gratings. This extends the applicability of previous results.","PeriodicalId":17976,"journal":{"name":"Laser Physics","volume":"49 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140831724","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}
引用次数: 0
Extra-cavity modulation of a chirped Gaussian bisoliton 啁啾高斯双利子的腔外调制
IF 1.2 4区 物理与天体物理
Laser Physics Pub Date : 2024-04-30 DOI: 10.1088/1555-6611/ad3cca
Dayu Wang, Wenyue Li, Yangyang Peng, Haoming Wang, Guangyu Xu, Keyun Zhang, Yan Zhou
{"title":"Extra-cavity modulation of a chirped Gaussian bisoliton","authors":"Dayu Wang, Wenyue Li, Yangyang Peng, Haoming Wang, Guangyu Xu, Keyun Zhang, Yan Zhou","doi":"10.1088/1555-6611/ad3cca","DOIUrl":"https://doi.org/10.1088/1555-6611/ad3cca","url":null,"abstract":"Optical solitons can find important applications in optical fiber communication systems. Here, we simulate extra-cavity modulation of a chirped Gaussian bisoliton in a 1 <italic toggle=\"yes\">μ</italic>m wavelength band. Several different soliton parameters are varied (including the amplitude ratio and time delay of orthogonal components, the projection angle, phase difference, pulse chirps and propagation distances), to effectively change the optical spectra and pulse shapes of the initial input chirped Gaussian bisoliton. For example, when the two branches in the optical fiber modulation system have the same or different fiber lengths, the modulated chirped Gaussian bisoliton will show obviously different properties in the time domain for orthogonally polarized components, while the corresponding optical spectra have no obvious differences. The simulation results reveal the effects of extra-cavity modulation of the chirped Gaussian bisoliton, which further explores the field of soliton shaping out of a fiber laser cavity.","PeriodicalId":17976,"journal":{"name":"Laser Physics","volume":"31 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140832015","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}
引用次数: 0
In-situ online detection of carbon during combustion via laser-induced breakdown spectroscopy 通过激光诱导击穿光谱对燃烧过程中的碳进行原位在线检测
IF 1.2 4区 物理与天体物理
Laser Physics Pub Date : 2024-04-28 DOI: 10.1088/1555-6611/ad3cc9
Yifan Ge, Nuerbiye Aizezi, Zhuoyan Zhou, Jinzhu Cai and Yuzhu Liu
{"title":"In-situ online detection of carbon during combustion via laser-induced breakdown spectroscopy","authors":"Yifan Ge, Nuerbiye Aizezi, Zhuoyan Zhou, Jinzhu Cai and Yuzhu Liu","doi":"10.1088/1555-6611/ad3cc9","DOIUrl":"https://doi.org/10.1088/1555-6611/ad3cc9","url":null,"abstract":"The combustion of fossil fuels is primarily responsible for disrupting the carbon cycle equilibrium by releasing greenhouse gases (GHGs). Therefore, detecting GHG emissions from fossil fuels is extremely important. In this study, utilizing laser-induced breakdown spectroscopy (LIBS), a new method for real-time in-situ detection of carbon fluctuations during combustion has been developed. The combustion of fossil fuels is emulated through the controlled burning of candles within a confined area, and the elemental content of the surrounding air during this process is analyzed. Fluctuations in the intensity of CN spectral lines were tracked to reveal changes in carbon concentration. The backpropagation neural network (BPNN) is used to identify and verify local air with different carbon concentrations, and the predictions are accurate. In conclusion, the integration of BPNN and LIBS for the purpose of identifying variations in carbon content during combustion provides an effective method for environmental management.","PeriodicalId":17976,"journal":{"name":"Laser Physics","volume":"29 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140809440","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}
引用次数: 0
Improving the capacity of quantum dense coding with both spontaneous emission and dephasing by non-Hermitian operation 通过非赫米提操作提高同时具有自发发射和相消的量子密集编码的容量
IF 1.2 4区 物理与天体物理
Laser Physics Pub Date : 2024-04-17 DOI: 10.1088/1555-6611/ad3aec
Fei Chen, Yang Leng
{"title":"Improving the capacity of quantum dense coding with both spontaneous emission and dephasing by non-Hermitian operation","authors":"Fei Chen, Yang Leng","doi":"10.1088/1555-6611/ad3aec","DOIUrl":"https://doi.org/10.1088/1555-6611/ad3aec","url":null,"abstract":"Using a non-Hermitian operation approach, we propose a scheme to improve quantum dense coding of a qubit-qubit system interacting with a zero-temperature reservoir with both spontaneous emission and dephasing. By solving the master equation of the two-qubit system, we numerically obtain the final capacity of quantum dense coding. The numerical results show explicitly that the non-Hermitian operation indeed helps to improve the non-Hermitian operation from amplitude-phase decoherence. In particular, non-Hermitian operations can protect quantum dense coding more efficiently in the case of strong decay rates than those with small decay rates.","PeriodicalId":17976,"journal":{"name":"Laser Physics","volume":"23 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140611719","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}
引用次数: 0
New quantum LDPC codes based on Euclidean Geometry 基于欧氏几何的新型量子 LDPC 码
IF 1.2 4区 物理与天体物理
Laser Physics Pub Date : 2024-04-15 DOI: 10.1088/1555-6611/ad3aed
Ya’nan Feng, Chuchen Tang, Chenming Bai
{"title":"New quantum LDPC codes based on Euclidean Geometry","authors":"Ya’nan Feng, Chuchen Tang, Chenming Bai","doi":"10.1088/1555-6611/ad3aed","DOIUrl":"https://doi.org/10.1088/1555-6611/ad3aed","url":null,"abstract":"With the advancements in quantum error correction technique, quantum low density parity check (QLDPC) codes have emerged as a promising area in the field of quantum error correction. This paper focuses on the requirement of QLDPC codes based on points excluding the origin, and lines that do not pass through the origin of Euclidean Geometry. It also explores QLDPC codes based on all the points and lines. Finally, a series of simulation analyses are presented.","PeriodicalId":17976,"journal":{"name":"Laser Physics","volume":"16 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140611717","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}
引用次数: 0
23 KHz linewidth 1064 nm SOA based fiber laser by using parallel type subring cavities 使用平行型亚环腔的基于 SOA 的 23 KHz 线宽 1064 nm 光纤激光器
IF 1.2 4区 物理与天体物理
Laser Physics Pub Date : 2024-04-15 DOI: 10.1088/1555-6611/ad3ae8
Shien-Kuei Liaw, Lina Marlina, Zi Wang, Shu-Miao Chen, Bo-Heng Lee, Hsiou-Hsin Tsai
{"title":"23 KHz linewidth 1064 nm SOA based fiber laser by using parallel type subring cavities","authors":"Shien-Kuei Liaw, Lina Marlina, Zi Wang, Shu-Miao Chen, Bo-Heng Lee, Hsiou-Hsin Tsai","doi":"10.1088/1555-6611/ad3ae8","DOIUrl":"https://doi.org/10.1088/1555-6611/ad3ae8","url":null,"abstract":"This study presents a high-quality fiber ring laser created by integrating a semiconductor optical amplifier to generate amplified spontaneous emission with a four-subring resonator and utilizing the nonlinear polarization rotator effect. When the driven current of 400 mA, the laser exhibited a maximum power deviation of 0.204 dB and a wavelength deviation of 0.012 nm during a one-hour testing period. Furthermore, utilizing a delayed self-heterodyne measurement system, we measured the linewidth of the self-made fiber laser to be 23 kHz.","PeriodicalId":17976,"journal":{"name":"Laser Physics","volume":"67 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140611723","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}
引用次数: 0
Laser processing characteristics of PCD tool and modeling analysis PCD 刀具的激光加工特性及建模分析
IF 1.2 4区 物理与天体物理
Laser Physics Pub Date : 2024-04-15 DOI: 10.1088/1555-6611/ad3ae5
Ruiwang Tan, Xu Wang, Zhanjiang Yu, Guangfeng Shi, Shen Yang, Yiquan Li, Jinkai Xu
{"title":"Laser processing characteristics of PCD tool and modeling analysis","authors":"Ruiwang Tan, Xu Wang, Zhanjiang Yu, Guangfeng Shi, Shen Yang, Yiquan Li, Jinkai Xu","doi":"10.1088/1555-6611/ad3ae5","DOIUrl":"https://doi.org/10.1088/1555-6611/ad3ae5","url":null,"abstract":"Through in-depth analysis of the experimental details and forming patterns of the nanosecond laser ablation polycrystalline diamond (PCD) textured tool processing system, this study explores the microscopic morphology and dimensions of micro-pits texture on the surface of PCD tools influenced by defocus amount, laser power, and pulse frequency. Experimental results indicate that the micro-pit textures generated under different parameters exhibit diversity, including rounded structure, fragments, recast layers, and heat-affected zones. The diameter and depth of micro-pits are comprehensively affected by defocus amount, laser power, and pulse frequency, showing complex patterns. After a thorough analysis of the effects of each parameter on the texture morphology, an artificial neural network (ANN) model is introduced for the prediction of micro-pit dimensions. Through model training and optimization, accurate predictions of micro-pit diameter and depth are obtained. In comparison to traditional regression models, the ANN model demonstrates outstanding predictive performance, validating its applicability in complex machining processes. This study not only provides a profound understanding of the processing patterns of PCD textured tools but also offers an effective predictive model for the optimization and control of similar future machining processes.","PeriodicalId":17976,"journal":{"name":"Laser Physics","volume":"127 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140611711","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}
引用次数: 0
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