1 中国科学院上海光学精密机械研究所空间激光信息传输与探测技术重点实验室，上海 201800
2 中国科学院大学材料与光电研究中心，北京 100049
利用腔内倍频532 nm激光器抽运单谐振光学参量振荡器（SRO），设计了一种可输出972 nm激光的脉冲激光器，通过腔外倍频成功获得486 nm蓝光。在重复频率为1 kHz的条件下，当532 nm激光脉冲能量为3.87 mJ时，972 nm SRO信号光单脉冲能量可达0.96 mJ，此时获得最大转换效率24.8%，与理论计算值22.3%相近。倍频后获得最大能量为49 μJ的486 nm蓝光脉冲，脉冲宽度约为6.9 ns，最大倍频效率为5.3%。
激光光学 蓝光激光 光参量振荡 腔外倍频 三硼酸锂晶体 全固态激光 中国激光
2023, 50(22): 2201007
Author Affiliations
Abstract
1 Key Laboratory of Space Laser Communication and Detection Technology, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2 Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
3 Pilot National Laboratory for Marine Science and Technology, Qingdao 266237, China
A 222 nm all-solid-state far-ultraviolet C (UVC) pulse laser system based on an optical parametric oscillator (OPO) and second-harmonic generation (SHG) using (BBO) crystals was demonstrated. Pumped by a laser with a repetition rate of 100 Hz at 355 nm, the maximum signal laser pulse energy of 1.22 mJ at 444 nm wavelength was obtained from the BBO-OPO system, corresponding to a conversion efficiency of 27.9%. The maximum output pulse energy of 164.9 µJ at the 222 nm wavelength was successfully achieved, corresponding to an SHG conversion efficiency of 16.2%. Moreover, the tunable output wavelength of UVC light from 210 nm to 252.5 nm was achieved.
all-solid-state pulse laser UVC disinfection optical parametric oscillator second-harmonic generation Chinese Optics Letters
2023, 21(1): 011401
1 中国科学院上海光学精密机械研究所中科院空间激光信息传输与探测技术重点实验室，上海 201800
2 中国科学院大学材料与光电研究中心，北京 100049
海洋探测激光雷达和水下无线光通信应用对激光发射源的波长、重复频率和峰值功率等均提出了特殊的要求。具有高峰值功率的蓝绿波段纳秒脉冲激光，尤其是在大洋水中衰减系数更小的蓝光，在海洋主动遥感和信息高速传输中有着十分重要的应用。对国内外蓝光脉冲激光器技术的发展现状进行了综述，并从高重复频率、多波长和大能量、高峰值功率两种类型的应用需求出发，详细介绍了针对486.1 nm夫琅禾费暗线的蓝光脉冲激光器的最新研究工作。
激光器 蓝绿激光 夫琅禾费暗线 光学参量振荡器 非线性频率变换 光学学报
2022, 42(17): 1714002
Author Affiliations
Abstract
1 Key Laboratory of Space Laser Communication and Detection Technology, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2 Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
3 Pilot National Laboratory for Marine Science and Technology, Qingdao 266237, China
A single-resonant low-threshold type-I (BBO) optical parametric oscillator (OPO) with tunable output from 410 nm to 630 nm at 5 kHz repetition rate is reported. By taking the noncollinear phase matching method, low-threshold OPO operation could be obtained compared with the configuration of collinear phase matching, and the maximum optical–optical conversion efficiency of 11.8% was achieved at 500 nm wavelength when 0.4 mJ pump pulse energy was applied. When the noncollinearity angle was preset at 1.6°, 4.8°, and 6.3°, a continuously tuning output with a total spectral range of 220 nm was successfully obtained by adjusting the phase matching angle of the BBO crystal.
optical parametric oscillator noncollinear phase matching low threshold high pulse repetition frequency widely tunable spectrum range Chinese Optics Letters
2022, 20(2): 021403
Author Affiliations
Abstract
1 Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China
2 MoE Key Laboratory for Biomedical Photonics, School of Engineering Sciences, Huazhong University of Science and Technology, Wuhan 430074, China
3 School of Biomedical Engineering, Hainan University, Haikou 570228, China
Rapid large-area tissue imaging at the cellular resolution is important for clinical diagnosis. We present a probe-based confocal microendoscope (pCM) with a field-of-view (FOV) diameter over 500 μm, lateral resolution of 1.95 μm, and outer diameter of 2.6 mm, compatible with the biopsy channel of conventional gastroscopes. Compared to a conventional pCM, our system’s FOV increased by a factor of 4 while maintaining the probe size and cellular resolution—comparable to the FOV of Zeiss Axio Observer’s numerical aperture objective lens. Ex vivo imaging of wide areas in healthy and diseased rat gastrointestinal tract tissues demonstrates the system’s practicality.
Photonics Research
2021, 9(9): 09001829
1 合肥工业大学电子科学与应用物理学院, 安徽 合肥 230009
2 合肥工业大学特种显示技术国家工程实验室, 现代显示技术省部共建国家重点实验室, 光电技术研究院, 安徽 合肥 230009
3 合肥工业大学仪器科学与光电工程学院, 安徽 合肥 230009
高性能体全息光栅是全息波导的重要耦合元件,角带宽小、平均衍射效率不高是制约体全息光栅性能的重要因素。以不对称倾斜记录为出发点,设计并制备了大角带宽高衍射效率的体全息光栅。首先讨论在横电模式光和横磁模式光下体全息光栅的记录参数与其衍射效率的关系,找到平均衍射效率较高的记录参数范围,随后进一步分析在此范围内的记录参数与体全息光栅的角带宽的关系,从而确定获得大角带宽高衍射效率体全息光栅的最佳记录参数。实验结果表明:在参考光入射角度为25°、信号光入射角度为30°时,制备的体全息光栅的角带宽达到±14°,衍射效率为82%。
衍射 体全息光栅 衍射效率 角带宽 记录角度
设计了一种用于激光三维成像的128×2线性模式APD焦平面探测器，器件包括硅基APD焦平面阵列和读出电路。硅基APD焦平面阵列采用拉通型n+pπp+结构，像元中心距为150μm，工作在线性倍增模式。读出电路采用单片集成技术，将前置放大电路、TDC计时电路和ADC等功能模块集成在单一硅片上。整个线性模式APD焦平面探测器可实现128×2阵列规模的激光信号并行检测，并采用LVDS串口输出激光脉冲信号的飞行时间信息和峰值强度信息。测试结果显示，该线性模式APD三维成像探测器可同时获取时间信息和强度信息，成像功能正常。
雪崩光电二极管 读出电路 焦平面阵列 三维成像 激光雷达 avalanche photodiode ROIC focal plane array 3D imaging LIDAR
1 合肥工业大学 电子科学与应用物理学院，合肥 230009
2 合肥工业大学 特种显示技术国家工程实验室 现代显示技术省部共建国家重点实验室 光电技术研究院，合肥 230009
3 合肥工业大学 仪器科学与光电工程学院，合肥 230009
针对浮雕光栅实际加工的光栅形貌与理论设计形貌存在差异的情况，提出从傅里叶级数的角度去分析光栅结构，探讨光栅傅里叶级数展开式中各空间频率分量对其结构和衍射效率的影响，试图在保证高衍射效率的同时，降低光栅的制备难度。对常见的周期性浮雕光栅进行傅里叶级数展开，减少高频分量，代入仿真软件建模并计算其衍射效率。仿真结果表明：对于矩形光栅，光栅陡直度为46.3°时即可满足最高衍射效率要求；而对于直角三角光栅，光栅陡直度为80.4°并且光刻分辨率不低于300 nm时才可满足最高衍射效率。针对不同结构的浮雕光栅，在满足最高衍射效率时保留的高频含量是不同的，文中提出的分析方法能帮助设计者根据具体的光栅结构，提出加工精度要求，制定具体加工方案，降低加工制备难度。
光栅 衍射效率 傅里叶级数 高频分量 陡直度 grating diffraction efficiency Fourier series high frequency component steepness
中国科学院上海光学精密机械研究所空间激光信息传输与探测技术重点实验室, 上海 201800
蓝绿激光位于海水低损耗窗口区, 由于水体吸收和散射, 光束在水下传输将发生时空扩展和波形畸变。基于蒙特卡罗仿真分析 了蓝绿激光海洋传输特性, 特别是激光发射参数对接收光场分布的影响。提出通过调节发射端的光束发射参数, 对发射光束进行 预聚焦, 可在一定程度上抵消水体传输引起的光束扩散影响。分析和仿真结果表明, IB水体中, 当预聚焦角度与水体小角度散射 特征值相当时, 可在设计汇聚距离前形成一段光束扩散缓慢的平坦传输区域; 当预聚焦角度大于小角度散射特征值的2倍时, 可在设计聚焦距离附近形成汇聚效果; 预聚焦角度越大, 汇聚效果越明显; 水体变差时, 相应有效汇聚距离变短。研究成果 为调控蓝绿激光信号在海水的传输特性提供了一种新的思路。
蓝绿激光 蒙特卡罗仿真 光束预聚焦 散射 海洋传输特性 blue-green laser Monte Carlo simulation beam pre-focusing scattering ocean propagation characteristics
Author Affiliations
Abstract
Key Laboratory of Space Laser Communication and Detection Technology, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
One fast simulation method using Markov chains was introduced to simulate angular, energy, and temporal characteristics of pulsed laser beam propagation underwater. Angular dispersion of photons with a different number of collisions was calculated based on scattering function and the state transition matrix of Markov chains. Temporal distribution and energy on the receiving plane were obtained, respectively, by use of a novel successive layering model and receiving ratio. The validity of this method was verified by comparing it with the Monte Carlo ray tracing (MCRT) method. The simulation results were close to those obtained by MCRT but were less time consuming and had smoother curves.
010.3310 Laser beam transmission 010.4458 Oceanic scattering Chinese Optics Letters
2019, 17(10): 100003
