CVL横向泵浦的染料激光放大器中泵浦光纵向分布对效应的影响

本文建立了一套较为全面地描述铜蒸汽蒸光器横向泵浦的染料激光放大器中各种效应的速率方程。首次计算、分析了泵浦光纵向分布在不同输入信号下对转换效率的影响，并且讨论了所得结果对于设计和改进染料激光放大器的理论指导意义。     

电子束泵浦KrF激光放大器增益与吸收的测量

为研制百焦耳级ＫｒＦ激光放大器，发展ＭＯＰＡ系统，我们用自探测法在百焦耳级电子束泵浦ＫｒＦ激光装置上进行了激光放大器的增益与吸收的测量。泵浦率约为０．６７ＭＷ／ｃｍ￣２，激光介质为８９．６％Ａｒ：１０％Ｋｒ：０．４％Ｆ＿２的混合气体，总气压０．２５ＭＰａ，实验测得激光放大器的小信号增益系数ｇ＿０＝６．６％ｃｍ￣（－１）、非饱和吸收系数α＿ｎ＝０．９３％ｃｍ￣（－１）、饱和光强Ｉ＿ｓ＝２．５ＭＷ／ｃｍ￣２。     

电子束泵浦KrF激光放大器增益与吸收的测量

为研制百焦耳级ＫｒＦ激光放大器，发展ＭＯＰＡ系统，我们用自探测法在百焦耳级电子束泵浦ＫｒＦ激光装置上进行了激光放大器的增益与吸收的测量。泵浦率约为０．６７ＭＷ／ｃｍ￣２，激光介质为８９．６％Ａｒ：１０％Ｋｒ：０．４％Ｆ＿２的混合气体，总气压０．２５ＭＰａ，实验测得激光放大器的小信号增益系数ｇ＿０＝６．６％ｃｍ￣（－１）、非饱和吸收系数α＿ｎ＝０．９３％ｃｍ￣（－１）、饱和光强Ｉ＿ｓ＝２．５ＭＷ／ｃｍ￣２。     

超短脉冲染料放大器中的参数研究

对超短脉冲染料放大器(DLA)中放大的自发辐射(ASE)随泵浦强度变化的关系进行了实验研究,为了求得具有高储能、低自发辐射背景噪声的染料激光放大器的泵浦强度,我们用速率方程对实验结果进行了解析分析,获得了染料激光放大器的泵浦强度与染料参数(浓度、增益长度等)的近似关系式,以及相应条件下染料激光放大器储能和小信号增益的表达式,并与实验进行了比较.二者符合较好,从而为染料激光放大器的设计提供了参考.     

用于ps脉冲放大的大口径放电泵浦KrF激光器

 以简单的火花间隙作为放电开关，建立了一种用于ps脉冲激光放大的大口径放电泵浦KrF准分子激光器。该激光器的有效增益口径截面为4cm×3cm，在自由运转情况下最大激光输出能量为1.3J，脉宽20ns。用作ps放大器时，利用光学偏振放大方式获得了激光能量140mJ，脉冲宽度10ps的激光输出。利用XeCl激光泵浦的染料激光作为探针测量了不同放电条件下和不同气分比条件下激光的增益和吸收系数。     

308nmXeCl准分子激光泵浦猝灭式可调谐染料激光器研究

描述了获得准分子激光超脉冲的一种方法，理论上扼要地介绍了淬来式染料激光器产生超短脉冲激光的机理。实验上以香豆素４９８染料得到波长为４９６ｎｍ，脉宽１ｎｓ，能量１．１ｍＪ的染料激光。     

激光二极管列阵泵浦的位相共轭板条YAG激光放大系统

采用新型的微通道冷却半导体激光二极管列阵泵浦ＹＡＧ激光振荡器及板条ＹＡＧ放大器，文中用ＣＣｌ４受激布里渊散射作位相共轭镜，使激光在板条放大器中作多通放大，获得了高重复率下小于１．５倍衍射极限的高质量１．０６μｍ的激光输出，其脉冲宽度为１５ｎｓ，平均功率为１８０Ｗ。     

高功率脉冲染料激光放大器物理设计

从理论研究出发,用激光增益理论得到了在平衡状态下忽略染料分子激发态吸收时,高功率脉冲梁料激光放大器物理设计的简单方法,同时以铜蒸气激光器双侧抽运的平均输出功率52.5W的脉冲染料激光放大器为例,对其物理尺寸进行了模拟设计。     

LD端面泵浦Nd：YLF激光放大器研究

 描述了对高功率LD端面泵浦Nd：YLF激光放大器的研究。放大器的耦合结构采用微透镜对泵浦光进行准直，透镜导管（Lensduct）对其汇聚，耦合效率达72.2%。用该放大器构成的振荡器的斜效率为35.9%。该激光放大器的口径为Φ 10mm，在1053nm处具有2.66的小信号增益。     

氙灯泵浦钕玻璃放大器储能效率研究北大核心CSCD

按照激光放大器能量传输和转化过程,利用激光速率方程和氙灯辐射方程、光线追迹软件等理论方法和分析计算工具,对氙灯泵浦钕玻璃激光放大器进行储能效率和能量转换环节的理论分析以及定量、半定量计算,系统分析各种能量转化与损耗因素对放大器储能效率的影响。理论研究的成果与放大器实验考核的结果相一致。     

Optimum gain length for pulsed dye laser amplifiers

It is shown analytically that for a pulsed dye laser amplifier, transversely pumped by a short duration pulsed laser, there exists an optimum gain length of the amplifier at dye laser wavelengths at which ground state absorption does not vanish. Thus, if the available pump power is distributed over this gain length, the extraction efficiency and the saturated gain of the amplifier reaches a maximum. The dependence of the extraction efficiency and gain on the amplifier length is strongly affected by the nonlinear absorption of the dye laser arising from excited state absorption, subsequent to ground state absorption.     

10 ps High Power Laser System at 248 nm

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10 ps High Power Laser System at 248 nm

A simple 10 ps KrF laser system consisting of quenched dye laser oscillator pumped by a XeCl laser, a distributed feedback dye laser (DFDL), a three-stage dye amplifier and a two-stage KrF amplifier are described. The output of the laser system is 140 mJ with 10 ps pulse width by using polarization-multiplexing amplification. A focused output laser intensity of about 4×1015 W/cm2 is obtained. The saturation fluence for KrF laser is obtained with this laser.     

多纵模短腔染料激光放大前后光谱的比较

实验观测了短腔染料激光器输出的多纵模激光及其经一级染料放大的激光光谱，比较了光谱特性。在一定情况下，短腔染料激光器的多纵模激光经放大器放大可产生一个至几个新纵模，新纵模与短腔染料激光器输出的纵模有相似的频率间隔、线宽及频率牵引等特征。新纵模产生属于三阶四光子混频（即四波混频）为主导的非线性光学效应。存在频率牵引表明，增益介质中的多波混频存在频率失配，在这一四波混频中光子能量并不守恒     

Temporal dynamics of high repetition rate pulsed single longitudinal mode dye laser

Theoretical and experimental studies of temporal dynamics of grazing incidence grating (GIG) cavity, single-mode dye laser pumped by high repetition rate copper vapour laser (CVL) are presented. Spectral chirp of the dye laser as they evolve in the cavity due to transient phase dynamics of the amplifier gain medium is studied. Effect of grating efficiency, focal spot size, pump power and other cavity parameters on the temporal behaviour of narrow band dye laser such as build-up time, pulse shape and pulse width is studied using the four level dye laser rate equation and photon evolution equation. These results are compared with experimental observations of GIG single-mode dye laser cavity. The effect of pulse stretching of CVL pump pulse on the temporal dynamics of the dye laser is studied.     

Synchronously pumped femtosecond dye oscillator-amplifier system at 815 nm

A tunable dye oscillator-amplifier system that produces 0.25 mJ, 105 fs pulses at 815 nm is demonstrated. The system consists of a synchronously pumped femtosecond dye laser followed by a dye amplifier that is quasi-longitudinally pumped using the frequency-doubled output from a Nd:YAG regenerative amplifier.     

Efficient amplification of sub-picosecond pulses of a non-CW dye laser

Efficient amplification in a dye laser amplifier is investigated theoretically and experimentally. A five-level rate equation approach is considered including rotational relaxation of the dye molecules. The effects of the pump pulse duration and of the parameters of the input pulse are discussed. The results are compared with experimental data for 0.5 ps pulses of a pulsed dye laser. Conversion efficiencies >10% are achieved for a single pass amplifier using Nd:YAG pump pulses of 2 ns while an effective fluorescence lifetime of 1.7±0.2 ns is determined for the gain medium rhodamine 6G. The triple pass amplifier stage of the laser system achieves an energy conversion of 4% with 40 J output pulses.     

Spectral purity of pulsed dye lasers

High-spectral purity of pulsed dye lasers is required by many experiments. Unfortunately, the dye laser output is usually accompanied by a spectrally broadband background of spontaneous emission (ASE). We have carried out detailed studies of the ASE background using a dye laser operating with an oscillator, pre- and main amplifier.Dedicated to Prof. Dr. Herbert Welling on the occasion of his 60th birthday