光子学报
2023, 52(12): 1206004
红外与激光工程
2023, 52(11): 20230129
1 中国科学技术大学 核探测与核电子学国家重点实验室, 合肥 230026
2 中国科学技术大学 物理学院 安徽省光电子科学与技术重点实验室, 合肥 230026
3 先进激光技术安徽省实验室, 合肥 230026
为了获得不同中心波长的锁模脉冲, 采用带有保偏光纤的Sagnac环滤波器和半导体可饱和吸收镜搭建了结构紧凑的可调谐锁模激光器, 并进行了实验验证。结果表明, 当该激光器工作在单波长锁模状态时, 具有良好的波长调谐功能, 其输出波长在1031 nm~1040 nm范围内连续可调; 该激光器还能输出稳定的双波长异步脉冲序列, 两波长间隔在10 nm左右, 且各波长的带宽可通过偏振控制器调节。该研究可以为搭建结构紧凑的可调谐激光器提供设计方案。
激光器 可调谐激光器 Sagnac环滤波器 掺镱光纤激光器 lasers tunable laser Sagnac loop filter ytterbium-doped fiber laser
郑文龙 1,2,3莫锦恋 1,2,3高震森 1,2,3徐鹏柏 1,2,3董新永 1,2,3,*
1 广东工业大学 信息工程学院,广州 510006
2 广东工业大学 先进光子技术研究所,广州 510006
3 广东省信息光子技术重点实验室,广州 510006
基于简化的二能级激光系统和均匀展宽理论模型,利用原子速率方程和功率传输方程建立了掺铥光纤激光器的理论模型,并以环形腔掺铥光纤激光器为例,通过Matlab编程数值模拟研究了其出射功率和波长调谐范围与腔内损耗、掺铥光纤长度、输出耦合比、泵浦波长和泵浦功率等激光器参量的关系。数值模拟结果表明,降低激光器腔内损耗、提高泵浦激光功率和优化掺铥光纤长度可以提高掺铥光纤激光器的出射功率和增加波长调谐范围,而增加输出耦合比虽能提高激光功率,却减小了波长调谐范围。经过参数优化,在腔内总损耗为3 dB、输出耦合比为10%的情况下,通过提高泵浦激光功率和优化掺铥光纤长度,掺铥光纤激光器的波长调谐范围可达528 nm(1 660~2 188 nm),高于目前已报道的实验结果。将部分模拟结果与文献报道的实验结果进行对比,较好地证实了模型的准确性。研究工作对于掺铥光纤激光器的设计和发展具有重要的理论参考价值和指导意义。
掺铥光纤激光器 理论模拟 波长可调谐激光器 thulium-doped fiber laser theoretical simulation wavelength tunable laser
1 河北工业大学 机械工程学院，天津 300130
2 天津大学 精密测试技术及仪器国家重点实验室，天津300072
3 天津工业大学 天津市电工电能新技术重点实验室，天津 300387
调谐激光吸收光谱（TLAS）技术具有非接触、抗干扰、高灵敏度等优势，可对气体进行浓度、温度、压强的测量。目前已有的压强检测模型中多以谱线的有限特征点进行提取与计算，存在易受干扰、测量误差较大的问题，因而有必要建立新的抗干扰、稳定性强的压强检测模型。针对此问题，文中根据吸收线宽的气体压力测量方法，提出了低压与高压范围内压强与谱线线型拟合函数的数学模型。结合谱线展宽原理，对不同压强下的二次谐波吸收线进行仿真研究。通过改变Gauss线型函数和Lorentz线型函数的半高宽比例关系模拟压强变化，分析信号拟合度的变化趋势，仿真结果表明，在理想情况以及激光器线宽、白噪声、背景干扰影响下，Gauss/Lorentz线型拟合度之比与压强之间存在三阶拟合关系，拟合度均保持在0.998 0以上，且与传统模型相比在动态噪声和背景干扰下具有更好的稳定性。最后对CO2气体1 580 nm位置的实测信号进行处理，实验结果表明，实际检测谱线Gauss/Lorentz线型拟合度之比与压强之间的三阶拟合度为0.986 3，略低于仿真的拟合度0.998 7，符合仿真分析结果。文中提出的方法可以根据吸收谱线的拟合比曲线反演气体压强，为气体压强检测提供了解决方案。
调谐激光吸收光谱 谱线展宽 曲线拟合 压强检测 tunable laser absorption spectroscopy spectral line broadening curve fitting pressure detection 红外与激光工程
2023, 52(8): 20230428
Author Affiliations
Abstract
1 Jiangsu Key Laboratory of Advanced Laser Materials and Devices, Jiangsu Normal University, Xuzhou 221116, China
2 College of Electronic and Information Engineering, Shandong University of Science and Technology, Qingdao 266590, China
3 Jiangsu Collaborative Innovation Center of Advanced Laser Technology and Emerging Industry, Jiangsu Normal University, Xuzhou 221116, China
In this paper, we report on a wide wavelength tuning optical vortex carrying orbital angular momentum (OAM) of ±ħ, from a thulium-doped yttrium aluminum perovskite (YAP) laser employing a birefringent filter. The OAM is experimentally found to be well maintained during the whole wavelength tuning process. The Laguerre–Gaussian () mode with a tuning range of 58 nm from 1934.8 to 1993.0 nm and mode with a range of 76 nm from 1920.4 to 1996.6 nm, are, respectively, obtained. This is, to the best of our knowledge, the first experimental implementation of wavelength tuning for a scalar vortex laser in the 2 µm spectral range, as well as the broadest tuning range ever reported from the vortex laser cavity. Such a vortex laser with robust structure and straightforward wavelength tuning capability will be an ideal light source for potential applications in the field of optical communication with one additional degree of freedom.
wavelength tunable laser 2 µm laser orbital angular momentum Chinese Optics Letters
2023, 21(2): 021405
Author Affiliations
Abstract
1 Key Laboratory of Intelligent Optical Sensing and Manipulation of the Ministry of Education & Nanjing University-Tongding Joint Lab for Large-scale Photonic Integrated Circuits & National Laboratory of Solid-State Microstructures & College of Engineering and Applied Science & Institute of Optical Communication Engineering, Nanjing University, Nanjing 210093, China
2 Department of Photonics and Institute of Electro-Optical Engineering, Taiwan Sun Yat-sen University, Kaohsiung 80424, China
In this Letter, we proposed and experimentally demonstrated a directly modulated tunable laser based on the multi-wavelength distributed feedback (DFB) laser array. The lasers are placed in series to avoid the usage of an optical combiner and additional power loss. A three-section design is utilized to reduce the interference from other lasers and improve the electro-optic response bandwidth. Besides, the reconstruction-equivalent-chirp technique is used to simplify the grating fabrication and precisely control the grating phase. We realized 12 channels with 100 GHz spacing with high side mode suppression ratios of above 50 dB. The output power of all the channels is above 14 mW. The 3 dB electro-optic bandwidth is above 20 GHz at a bias current of 100 mA for all four lasers. A 25 Gb/s data transmission over a standard single-mode fiber of up to 10 km is demonstrated for all 12 channels, and 50 Gb/s data per wavelength is obtained through the four-level pulse amplitude modulation. The proposed directly modulated tunable in-series DFB laser array shows the potential for a compact and low-cost light source for wavelength division multiplexing (WDM) systems, such as next-generation front-haul networks and passive optical networks.
tunable laser directly modulated laser laser array wavelength division multiplexing Chinese Optics Letters
2023, 21(1): 011403
Author Affiliations
Abstract
1 Key Laboratory of Intelligent Optical Sensing and Manipulation of the Ministry of Education, National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Institute of Optical Communication Engineering, and Nanjing University-Tongding Joint Laboratory for Large-Scale Photonic Integrated Circuits, Nanjing University, Nanjing 210023, China
2 School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
3 School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China
A wideband wavelength-tunable distributed feedback (DFB) semiconductor laser array based on the reconstruction-equivalent-chirp (REC) technique using a simple tuning scheme is demonstrated. It consists of 20 DFB lasers with matrix interleaving distributions, two-level cascaded Y-branch optical combiners, and one active semiconductor optical amplifier (SOA), all in-series integrated on one chip. Unlike the traditional thermal-electric cooler (TEC)-based wavelength-tuning scheme, the tunable REC-DFB laser array achieves a faster and broader continuous wavelength-tuning range using TaN thin-film heaters integrated on the AlN submount. By changing the injection current of the TaN resistor from 0 to 190 mA, the proposed tunable laser achieves a wavelength-tuning range of per channel and a total tuning of over 50 nm. This study opens up new avenues for realizing cost-effective and wide-tuning-range semiconductor lasers.
distributed feedback laser array reconstruction-equivalent-chirp technique tunable laser thin-film heater integrated on the submount wide tuning range Chinese Optics Letters
2023, 21(1): 011406
1 量子光学与光量子器件国家重点实验室，山西大学 光电研究所，太原
2 中北大学 理学院物理系，太原
3 极端光学省部共建协同创新中心，山西大学 ，太原
介绍了一种固态高功率318.6 nm紫外激光系统，通过1 560.5 nm和1 076.9 nm红外激光单次穿过PPMgO:LN准位相匹配晶体和频产生637.2 nm单频红光，之后637.2 nm激光经四镜环形腔增强偏硼酸钡（BBO）晶体谐振倍频产生~2W的窄线宽、连续可调谐的318.6 nm 紫外激光。基于此激光系统，研究了声光调制器（AOM）闭环主动反馈稳定318.6 nm 紫外激光功率，时域激光强度起伏由±11.12%抑制到了±0.08%，频域反馈环路响应带宽约13 kHz。之后将紫外激光结合铯冷原子磁光阱，研究了俘获损耗光谱。获得稳定的、窄线宽、连续可调谐的318.6 nm紫外激光，对研究铯里德堡原子间相互作用有重要意义。
固态高功率318.6 nm激光系统 窄线宽 连续可调谐激光 激光强度稳定 solid-state high power 318.6 nm enhanced laser sys narrow linewidth continuously tunable laser laser intensity stabilization
波长可调谐的超短脉冲激光对通讯、生物医药、度量和激光加工等领域研究有着非常重要的意义。通过非线性偏振旋转技术，利用腔内双折射效应搭建了波长可调谐全正色散超短脉冲掺镱光纤激光器。利用腔内双折射引起的光谱滤波效应，通过适当旋转波片和调整双折射滤波器的角度，耗散孤子可以从1 015~1 075 nm连续调谐。在调谐范围内，其脉冲重复频率25.6 MHz，脉冲宽度4.52 ps，输出功率为85 mW。
掺镱光纤激光 全正色散激光 波长可调谐激光 耗散孤子 Yd-doped fiber laser all-normal dispersion laser wavelength tunable laser dissipative solition
