Author Affiliations
Abstract
Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
A novel four light ray path test method for measuring residual reflectance has been presented. Residual reflectance spatial distribution at a cladding interface was measured using the technique. Residual reflectance could be on the order of 10?5 by matching the refractive index of Nd:glass, polymer, and cladding glass and eliminating defects in the adhesive layer. Residual reflection spatial distribution appears to be similar to Newton rings due to the edge surface flatness. The relationship between the residual reflectance and the edge surface flatness was discussed, and the results revealed that the edge surface flatness is very important during the cladding process.
residual reflectance edge cladding Nd:glass amplifier Chinese Optics Letters
2020, 18(9): 091402
Author Affiliations
Abstract
Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, No. 390 Qinghe Road, Jiading District, Shanghai 201800, China
Optimized convective heat transfer is applied to accelerate the thermal recovery of a large aperture multi-segment amplifier. The paper proposes a novel project of changing the structural parameters of the inlet jet to the Nd:glass slab in the multi-segment amplifier at the same flow rate. The convective heat transfer coefficient depends on the diameter of the inlet jet, as well as on the number of inlet jets. The simulation calculations indicate that at the same flow rate, different numbers of inlet jet lead to different temperature gradient contours and flow field distributions on the Nd:glass slab surface in the multi-segment amplifier. In addition, the convective heat transfer coefficient increases with the decrease of inlet diameter. This work analyzes the path of the coolant air over the slab surface to lessen the eddy and to achieve better convective heat transfer, as well as to determine the optimized number of inlet jets (5) and the optimized diameter (5 mm)
Flashlamp-pumped Nd:glass amplifier Flashlamp-pumped Nd:glass amplifier Thermal recovery Thermal recovery Numerical simulation Numerical simulation Collection Of theses on high power laser and plasma physics
2013, 11(1): 0189
宽带脉冲在钕玻璃放大器中传输时，由于受到增益窄化和增益饱和效应的影响，脉冲频谱将受到调制，从而产生边带丢失或者频谱两侧失衡，进而导致脉冲时间波形产生调制。针对不同的宽带光源模型，数值模拟了放大器输出波形的幅度调制，分析了增益带宽、输入脉冲带宽及增益曲线中心波长相对输入脉冲中心波长的偏差等因素对输出脉冲调制度的影响。结果表明: 不同的宽带光源脉冲经过钕玻璃放大器后，均会产生不同程度的幅度调制; 啁啾堆积脉冲比正弦相位调制脉冲产生的幅度调制小。
宽带光源 幅频效应 钕玻璃放大器 幅度调制 broadband laser source frequency modulation to amplitude modulation conve Nd-glass amplifier amplitude modulation 强激光与粒子束
2012, 24(12): 2811
1 中国科学院光电研究院,北京 100190
2 中国科学院研究生院,北京 100049
3 北京国科世纪激光技术有限公司,北京 100085
对侧面抽运模块的抽运结构进行了优化,采用漫反射腔设计,利用3个激光二极管阵列(LDA)旋转对称抽运尺寸为2 mm×75 mm,掺杂原子数分数为4%的钕玻璃棒。钕玻璃棒两端面镀有在1053 nm高透率为99.8%的增透膜,为消除放大的自发辐射(ASE)光振荡,钕玻璃两端面采用1.5°倾角设计。放大器采用集体制冷,产生的热量由在热沉中流动的去离子水带走。能量10 μJ,工作频率1 Hz,脉冲宽度3 ns,输出波长1053 nm的种子激光经过钕玻璃放大器后,在抽运功率为8.2 kW,抽运脉冲宽度为400 μs时达到了70倍的稳定高增益,放大器的荧光分布均匀,脉冲波形图放大后无畸变。
激光器 激光二极管阵列 侧面抽运 钕玻璃放大器 激光与光电子学进展
2010, 47(6): 061401
中国科学院上海光学精密机械研究所高功率激光物理国家实验室, 上海 201800
建立了氙灯辐射光谱、求解感容(LC)供电网络电路和研究泵浦动力学过程中粒子数反转的模拟计算程序,并根据国内外的实验和计算结果进行了校核。氙灯单位侧面积上的输入功率比电流密度能更好地描述氙灯的工作特性。计算结果还表明:当单位侧面积上的输入功率增加时氙灯的光谱效率下降。在似稳态条件下当输入功率不变时,不同直径的氙灯在泵浦区域内的辐射光谱和光谱效率几乎不变;电流密度不变时,氙灯的光谱效率和电-光转换效率随直径的增大而减小;泵浦宽度相同时,梯形泵浦的峰值电流比单级感容网络小,具有较高的光效;泵浦形状相同时,适当减小泵浦的宽度可提高泵浦效率,脉冲宽度减小10%,泵浦效率提高5%,与实验结果是一致的。
辐射光谱 氙灯 钕玻璃放大器
1 四川大学激光物理与化学研究所, 成都 610064
2 中国工程物理研究院核物理与化学研究所, 成都 610063
基于闪光灯和钕玻璃的实验数据,用光线追迹和蒙特卡罗法建立了多段阵列式钕玻璃放大器(MSA)的泵浦模型。模拟结果表明光传输效率和储能密度分布随MSA的几何尺寸和构形而变。
阵列式放大器（MSA） 钕玻璃放大器 光线追迹
