Generation of high energy and good beam quality pulses with a master oscillator power amplifier

A high efficiency and high peak power laser system with short-pulse and good beam quality has been demonstrated by using a master oscillator power amplifier with two-pass amplification configuration. The master oscillator, end-pumped with a fiber-coupled laser diode array, provides low power but excellent beam quality pulses, and the amplifier boosts the pulse energy by orders without significant beam quality degradation. Short pulses of 8.5 ns with energy up to 130 mJ and approximately diffraction limited beam quality have been demonstrated.     

三棒串接Nd∶YAG激光谐振腔的稳定性研究

采用激光谐振腔的矩阵理论分析了三棒串接的Nd∶YAG激光器的稳定特性 ,给出了对称放置的平行平面腔稳定区范围 .结果表明 ,合理选择棒的位置及工作参数 ,可提高激光器的输出功率 .另外 ,三根棒的热效应不相同会缩小激光器的稳定区范围 .设计了三棒串接的激光器 ,获得了 970W的输出功率 .     

脉冲激光电源系统的电压调节

本文讨论了脉冲激光电源系统的电压调节和调压精度问题.对于阶梯充电方式,着重分析其调压精度以及电压精度的影响因素与改善措施.对于连续充电方式,主要讨论其电压调节方式、参数的最佳化设计方法以及各种调压方式的精度问题.     

环氧树脂板CO2激光诱导液相金属沉积的研究

研究了水溶液介质中，以CO2激光作为诱导光源，在环氧树脂基材上沉积金属Ag的影响因素；利用电子探针分析了在不同条件下，环氧树脂表面所沉积的金属层的形貌、表面成分和金属沉积层厚度．指出：在一定条件下，扫描速度、基材表面的液膜厚度、溶液的浓度以及激光功率大小是影响金属沉积的主要因素。     

三棒串接Nd:YAG激光谐振腔的稳定性研究

采用激光谐振腔的矩阵理论分析了三棒串接的Nd：YYG激光器的稳定特性，给出了对称放置的平行平面腔稳定区范围．结果表明，合理选择棒的位置及工作参数，可提高激光器的输出功率．另外，三根棒的热效应不相同会缩小激光器的稳定区范围．设计了三棒串接的激光器，获得了970W的输出功率．     

High power CW diode-side-pumped Nd:YAG rod laser

We report on the characterization of a diode-side-pumped Nd:YAG rod laser operating at high CW output power. A four-fold pump configuration is designed and the pump light is directly coupled into the Nd:YAG rod without the help of any cylindrical lenses. The distribution of pump light in the Nd:YAG rod has been calculated by using ray tracing program. The thermal lens effect of the Nd:YAG rod has been experimentally measured. A maximum output power of 800 W at 1064 nm in multimode operation is obtained for a pump power of 2400 W with 33% optical-optical efficiency. At the same time, the maximum beam parameter product of 25 mm·mrad is achieved.     

Cr4+：YAG被动调Q激光器中受激粒子上转换效应对脉冲的影响研究

分析和报道了受激粒子能量上转换(ETU)效应对Cr:YAG 被动调Q Nd:YAG/Nd:YVO₄激光器的输出脉冲影响研究.结合ETU理论分析和被动调Q速率方程组，得到了初始反转粒子密度，末态反转粒子密度和光强最大时反转粒子密度的比值变化对激光输出脉冲宽度和脉冲能量的影响，和实验结果相一致.同时讨论了降低ETU效应的方法，有助于这类被动调Q激光器的优化设计. 关键词： 受激粒子能量上转换 Cr:YAG饱和吸收体 被动调Q     

无机元素对平菇生长发育的影响

平菇(Pleurotus ostreatus)为重要的人工栽培食用菌之一。本文就无机元素(钾、钙、镁、锰、磷、硫、铜、锌、铁等)对平菇菌丝体及子实体生长发育的影响进行了初步的探讨。试验结果显示:0.01—0.05%(w/v)的钙、钾、磷、硫及0.0001%(w/v)的铜、锌、铁对平菇菌丝体及子实体的生长发育有较好的促进作用。低浓度(0.01%)的锰、镁的促进作用不明显。除磷、硫浓度在0.10—0.20%也有促进作用外,其他各无机元素均不宜超过最适浓度,否则无明显促进作用,甚至有抑制作用。     

离轴抛物面反射式平行光管的结构设计

论述了一种作为红外目标源的离轴抛物面反射式平行光管系统的组成．按照系统特定的光源离焦调节使用指标要求,研究了该平行光管在设计时需考虑的光学结构参数的确定方法,综合考虑了抛物面镜口径及离轴量、平面反射镜尺寸及位置和光源离焦使用时的关系,给出了相应的计算公式,并根据计算结果确定了一组合适的平行光管参数,其中离轴抛物面镜参数为口径Ф=110mm,离轴量h=90mm,焦距f=650mm,平面反射镜口径为40mm,两镜中心距可调节范围为480--550mm．实验证明,此计算方法对该平行光管的整体结构设计具有一定的实用价值．     

Generation of high energy and good beam quality pulses with a master oscillator power amplifier

A high efficiency and high peak power laser system with short-pulse and good beam quality has been demonstrated by using a master oscillator power amplifier with two-pass amplification configuration. The master oscillator, end-pumped with a fiber-coupled laser diode array, provides low power but excellent beam quality pulses, and the amplifier boosts the pulse energy by orders without significant beam quality degradation. Short pulses of 8.5 ns with energy up to 130 mJ and approximately diffraction limited beam quality have been demonstrated.