Experimental Study on Flashlamp Pumped Nd3+∶KGd(WO4)2 Laser

The lasing properties of Nd∶KGW crystal in free-running mode with different transmission of the output couplers are reported.The best results have been obtained with the output coupler of 24% transmission.The slope efficiency is 1.0% and the extrapolated energy threshold is 0.54 J.A comparative experiment of Nd∶KGW and Nd∶YAG laser crystals has been cavried out under identical experimental conditions in both free-running and Q-switched modes.The much higher efficiency and the lower threshold for Nd∶KGW (Nd: 2.2 at.-%) compared to Nd∶YAG (Nd: 1.1 at.-%) at 1.064 μm are demonstrated in both operation mode.     

调Q倍频Nd：YAG激光泵浦氧气和氧－氦混合气体的受激拉曼散射

报道了调Ｑ倍频Ｎｄ：ＹＡＧ激光泵浦的高压工业用氧气和氧－氦混合气体的受激拉曼散射特性，研究了一阶、二阶斯托克斯（Ｓｔｏｋｅｓ）光的能量转换效率与泵浦光的能量及气压的关系，并探讨了如何抑制氧气的二阶斯托克斯的产生等问题。     

Nd: Sr_5 (PO_4 )_3 F Crystal Laser Characteristics Using GaAs as Passive Q-switch

1 IntroductionQ- switching Of diode-pumped lasers iS an effective technique because they provideshort duration optical pulses required for laser ranging, nonlinear studies, medidne andother important applications[1--#]. It is obvious that the replacement of an organic dyewith a solid-state one makeS a laser more convenient tO use. Semiconductor materialsare attractive for saturable absorber because Of the large optical nonlinearities that can beobtained, particularly in quantum--well .t..t..…     

Nd:Sr5(VO5)3F Q-Switched Lasers with Cr4+:YAG

The Cr4+-doped saturable absorber Cr4+:YAG is used as the passive Q-switch for a conventional pulsed Nd:Sr5(VO5)3F(Nd:S-VAP) oscillator, and the short high-peak-power pulses of laser have been obtained. The laser output characteristics are investigated under the conditions of different small-signal transmittance of Cr4+:YAG and different reflectivity of the output coupler. The rate equtions of Q-switched coupling wave are given, and the numerical solutions of equations are in agreement with the experimental results.     

Operational characteristics of a dye Q-switch for a pulsed ruby laser

This paper presents the results and analysis of experiments carried out on a dye Q-switch to evaluate its operational characteristics. The work was performed on a ruby laser, Q-switched by cryptocyanine in methanol solution. Investigations of performance with regards to pump energy, dye absorbance, output energy and timing of pulse emergence are graphically presented. These results were used to derive the efficiency of Q-switching for varying dye absorbance. Finally, optimization of the Q-switch performance for different requirements of the laser is considered.     

分布反馈激光特性的实验研究

研究了以脉冲YAG倍频激光泵浦Rh6G染料,产生分布反馈激光振荡的辐射光谱、转换效率、时间过程以及可调谐特性;发现在大于泵浦阈值下的分布反馈激光输出的多谱线结构与双脉冲辐射现象,以及分布反馈激光脉冲变窄的自开关效应.作为详细的实验观察和分析.     

单频脉冲透射式Q开关钕玻璃激光器

本文描述了一个单频钕玻璃激光器,它采用脉冲透射式Q开关和腔反射镜选模技术,获得了脉宽5ns,能量0.5mJ的单模激光脉冲.同时测量了其输出激光的空间、时间和光谱特性,其实验结果与最佳耦合Q开关激光理论的预测值一致.     

Cr~(4+): YAG被动调Q与激发态吸收饱和

运用速率方程计算了Ｃｒ４＋ＹＡＧ晶体的基态吸收、激发态吸收与入射脉冲的能量密度和强度的关系。在测量晶体透过率的实验中，发现Ｃｒ４＋ＹＡＧ晶体的激发态吸收趋于饱和。理论计算与实验数据拟合给出了包括基态吸收截面，激发态吸收截面和寿命等参数。在用Ｃｒ４＋ＹＡＧ对脉冲式ＮｄＹＡＧ激光器被动调Ｑ的实验中，得到脉宽５ｎｓ、能量９０ｍＪ的激光脉冲，并且发现这种调Ｑ与Ｃｒ４＋ＹＡＧ的激发态吸收饱和直接相关。     

MQW-LDA泵浦Nd:YLF激光器调Q的动力学过程及双机制作用

本文报道了国产多量子阱半导体激光列阵(MQW-LDA)泵浦Nd:YLF调Q脉冲脉宽.峰值功率与输出耦合率、泵浦速率、调制深度及延迟时间之间关系的实验,得到稳定的(起伏<1%)调Q脉冲输出,脉冲能量为0.8μJ,FWHM为70ns,脉冲重复率为100Hz,光-光效率2.5%;利用增益开关和Q开关双机制作用,压窄了调Q脉宽,提高了输出功率.用速率方程理论对过程计算,与实验结果较符合.     

High-performance langasite (La3Ga5SiO14) electro-optic Q-switch

By cone-light interference method, the best langasite ( La₃Ga₅SiO₁₄, LGS) crystal is chosen to make an electro-optic Q-switch. When the input energy is 28 J, the Q-switched output is 360 mJ. The stability is 0.45%; the dynamic–static ratio is 80.05%; and the total electric-optical conversion efficiency is 1.3%.