Author Affiliations
Abstract
1 State Key Laboratory of High Field Laser Physics and CAS Center for Excellence in Ultra-intense Laser Science, Shanghai Institute of Optics and Fine Mechanics (SIOM), Chinese Academy of Sciences (CAS), Shanghai201800, China
2 Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing100049, China
3 School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan430074, China
4 Laboratory of Thin Film Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai201800, China
In this study, a high-energy, temporally shaped picosecond ultraviolet (UV) laser running at 100 Hz is demonstrated, with its pulses boosted to 120 mJ by cascaded regenerative and double-pass amplifiers, resulting in a gain of more than 108. With precise manipulation and optimization, the amplified laser pulses were flat-top in the temporal and spatial domains to maintain high filling factors, which significantly improved the conversion efficiency of the subsequent third harmonic generation (THG). Finally, 91 mJ, 470 ps pulses were obtained at 355 nm, corresponding to a conversion efficiency as high as 76%, which, as far as we are aware of, is the highest THG efficiency for a high-repetition-rate picosecond laser. In addition, the energy stability of the UV laser is better than 1.07% (root mean square), which makes this laser an attractive source for a variety of fields including laser conditioning and micro-fabrication.
all-solid-state laser third harmonic generation ultraviolet laser High Power Laser Science and Engineering
2021, 9(3): 03000e38
1 中国科学技术大学环境科学与光电技术学院, 安徽 合肥 230026
2 中国科学院安徽光学精密机械研究所环境光学与技术重点实验室, 安徽 合肥 230031
3 安徽省环境光学监测技术重点实验室, 安徽 合肥 230031
传统的光学粒子计数方法受到粒子回波脉冲带宽限制,难以直接应用于超细颗粒物凝结增长后端的颗粒物数量检测。基于粒子光散射原理,采用高带宽粒子回波脉冲方案设计了颗粒物光学计数模块,在0.3 L·min -1采样流量下,15 μm标准聚苯乙烯颗粒回波脉冲半宽为650 ns,粒子计数效率得到有效提高。为了提高颗粒数浓度测量上限与精度,基于概率统计提出了粒子重叠校正方法,利用此方法颗粒物数浓度测量上限可达2×10 5 cm -3。在自制的正丁醇超细颗粒物凝结增长装置中开展了对比实验。结果表明,该系统与环境空气数浓度测量设备TSI-3788和Airmous-A20的相关性均超过0.98,与机动车尾气固态颗粒物数浓度法规测量设备MEXA-200SPCS的相关性高达0.96,从而验证了所设计的颗粒物光学计数模块及重叠校正方法的准确性。
散射 粒子光散射 光学粒子计数 单粒子回波脉冲 粒子重叠
1 中国科学院安徽光学精密机械研究所环境光学与技术重点实验室, 安徽 合肥 230031
2 中国科学技术大学, 安徽 合肥 230026
设计了一套基于USB2.0接口的便携式地面检测台,包括上位机软件和一台USB通讯适配器,用以 模拟卫星平台与星载光谱仪的数据通信。上位机软件提供人机交互界面,适配器完成了星载光谱仪低压 差分信号(LVDS)接口数传数据和数管数据对USB接口的通讯转换。 实验结果表明：所设计平台可以把光谱仪的LVDS图像数据转换为USB接口数据,并模拟卫星平台数据, 可用于对光谱仪进行调试、测试。通讯适配器USB2.0接口的实测速率可达230 Mbps, 可将其作为一个模块用于商用光谱仪的通讯接口。
光电子学 地面检测台 通用串行接口 低压差分信号 星载光谱仪 optoelectronics ground test platform universal serial interface low voltage differential signal satellite-bone spectrometer
