1 中国科学院空天信息创新研究院,北京 100094
2 北京邮电大学电子工程学院,北京 100876
3 中国科学院大学光电学院,北京 100049
4 齐鲁空天信息研究院,山东 济南 250101
5 中国地质大学(北京)数理学院,北京 100083
6 中国科学院计算光学成像技术重点实验室,北京 100094
激光相干合成技术是在遥感和通信等领域中能够同时提升激光功率和保持光束质量的有效技术。其中填充因子是影响激光相干合成和衡量相干合成阵列的重要因素。然而,它却不是完备的。因此,提出采用平面波前畸变量(PWD)作为评估激光相干合成性能的综合参数,该参数综合考虑了光束质量、阵列对准、元件制造误差以及其他因素。通过理论推导平面波前畸变量的表达式,分析该参数对系统合成效率的影响,进一步的仿真和实验测量结果表明,平面波前畸变量可以用于反映激光相干合成的综合效率高低,与桶中功率呈负相关。研究结果表明波阵面调制相干光束组合技术在多孔径激光阵列相干组合系统的实际应用中具有潜在的科学价值。
相干合成 填充因子 桶中功率 激光阵列 波前 激光与光电子学进展
2024, 61(7): 0706004
1 长春中科长光时空光电技术有限公司,吉林 长春 130102
2 中国科学院长春光学精密机械与物理研究所发光学及应用国家重点实验室,吉林 长春 130033
首次报道了连续输出功率>1 W、脉冲输出功率>10 W的1550 nm波长垂直腔面发射半导体激光器(VCSEL)阵列。对1550 nm VCSEL激光器单个发光单元的热阻特性进行了分析,建立了基于热阻分析及可变产热量的VCSEL阵列热模型,优化了VCSEL发光单元间距,在理论上保证了阵列内部具有均匀的温度分布。制备了发光单元边缘间距为30 μm的高密度集成1550 nm波长VCSEL阵列,并对其在连续工作及脉冲电源驱动条件下的输出特性进行了测试分析。当VCSEL阵列的工作温度为15 ℃时,最高连续输出功率达到1.05 W;即使工作温度增加至65 ℃,VCSEL的最高连续输出功率仍能达到0.42 W。在脉宽为5 μs、重复频率为1 kHz的脉冲条件下,VCSEL在15 ℃时的最大峰值功率达到10.5 W,此时VCSEL呈现出热饱和现象。当脉冲功率为10.5 W时,阵列远场的光斑仍然呈圆形对称形貌,两个正交方向上的远场发散角分别为26.69°和26.98°。
激光器 1550 nm 垂直腔面发射激光器阵列 高功率 人眼安全 激光雷达 中国激光
2023, 50(19): 1901008
Author Affiliations
Abstract
1 College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China
2 Nanhu Laser Laboratory, National University of Defense Technology, Changsha 410073, China
We experimentally demonstrated a cascaded internal phase control technique. A laser array with 12 channels was divided into three sub-arrays and a stage array, and phases of the sub-arrays and the stage array were locked by four phase controllers based on the stochastic parallel gradient descent (SPGD) algorithm, respectively. In this way, the phases of the whole array were locked, and the visibility of the interference pattern of the whole emitted laser array in the far field was . In addition, the technique has the advantage of element expanding and can be further used in the high-power coherent beam combination (CBC) system due to its compact spatial structure.
coherent beam combining laser array cascaded control internal phase control Chinese Optics Letters
2023, 21(8): 081402
强激光与粒子束
2023, 35(4): 041007
强激光与粒子束
2023, 35(4): 041003
强激光与粒子束
2023, 35(4): 041004
红外与激光工程
2023, 52(3): 20220446
1 长春理工大学高功率半导体激光国家重点实验室,吉林 长春 130022
2 中国科学院半导体研究所光电子器件国家工程研究中心,北京 100083
3 中国科学院大学材料科学与光电技术学院,北京 100049
为了提高808 nm激光器对固体激光器的泵浦效率,对其波长稳定性进行了研究。阐述了光栅设计的理论基础。将纳米压印、干法刻蚀及湿法腐蚀工艺相结合,制备了含有一阶光栅的808 nm分布反馈(DFB)激光器阵列。在准连续条件(脉宽为200 μs,频率为20 Hz)下对所制备的激光器进行性能测试。测试结果表明:所制备的808 nm DFB激光器阵列的发射波长随温度的漂移系数为0.06 nm/℃,温度锁定范围可达70 ℃(-10~60 ℃),随电流的漂移系数为0.006 nm/A。
激光器 锁定 808 nm 激光器阵列 一阶光栅
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