退压式La_3Ga_5SiO_(14)晶体电光调QNd∶YAG激光器激光性能研究

通过对硅酸镓镧(LGS)晶体旋光性与电光效应的交互作用的理论研究,推导出晶体旋光性和电光效应共同作用下的光强表示式I=1-4B2(Asin 2ω-Ccos 2ω)2。利用此表示式设计计算了旋光晶体LGS尺寸为8 mm×8 mm×25 mm电光Q开关在1064 nm波长使用时的开关电压和偏振角分别为4995 V和27.3°。将理论研究得到的结论应用于LGS晶体电光调Q的Nd∶YAG晶体激光器的实验研究中,实验结果与理论计算结果基本一致。得到输出能量为361 mJ,脉冲宽度为7.8 ns的脉冲激光输出。     

高脉冲重复频率调Q Tm,Ho:GdVO4激光器

报道了一个高效率连续波和调Q高重频两种运行方式的Tm,HoGdVO4激光器.Tm,HoGdVO4晶体尺寸4 mm×4 mm×7 mm,a轴通光,液氮制冷到100 K,由发射中心波长为793 nm的光纤耦合激光二极管端面泵浦.Tm,HoGdVO4激光连续波输出功率4.0 W,光光转换效率26%.声光调Q条件下输出平均高功率3.9 W,脉冲重复频率10 kHz,脉冲宽度50 ns. 通过减小声光Q开关的开启时间,激光脉冲宽度由50 ns减小至23 ns.在10 kHz重频下,测量最大脉冲能量0.39 mJ , 峰值功率7.8 kW.     

Optimization of intracavity Q-switched laser frequency doubling

The optimization theory for intracavity frequency-doubled Q-switched lasers is discussed. Nonlinear loss effects caused by the frequency doubler were introduced into the rate equations. The harmonic pulse characteristics such as peak power, pulse energy, pulsewidth were studied. Lagrange multiplier technique was adopted to maximize the peak power of the second-harmonic pulse for a given pumping level. It was found that the optimal frequency-doubling factor is constant and equals 1. Design curves for the laser characteristics parameter were established. The curves and expressions presented help in designing an optimal Q-switched intracavity frequency-doubled miniature laser and predict the pulse characteristics.     

一种新型固体Q开关——Cr^4＋：YAG的实验研究

对一种适用于Ｎｄ＾３＋：ＹＡＧ激光系统的新型波动Ｑ开关－掺铬钇铝石榴石（Ｃｒ＾４＋：ＹＡＧ）进行了实验研究，得到单脉冲量为１４５ｍＪ，脉宽为３０～４０ｎｓ，效率接近１％，动静比达４０％以上的结果。     

新型结构声光调Q激光器研究

为了提高声光调Q输出脉冲的重复率;通过分析影响脉冲输出特性的因素,提出了采用新颖的掠入射方式、线泵浦源侧面泵浦的特殊谐振腔结构,在泵浦功率50 W时,实现了重复频率500 kHz、脉冲宽度76.82 ns的高重复频率激光脉冲输出.结果表明,缩短脉冲建立时间,提高泵浦功率,可以有效地提高声光调Q激光器的重复频率.     

角锥棱镜腔主动调Q绿光固体激光器的研究

为了保证激光器在高重复频率运转时的输出能量不下降,采用角锥棱镜作为主动调Q激光器的全反射镜,利用其退偏特性和腔外双通倍频技术,在重复频率为25Hz时,532nm绿光的输出能量比1Hz时上升约6．9％,可满足水下激光主动成像系统对激光光源的要求。     

可调脉冲宽度的调Q掺铥双包层光纤激光器

在激光器输出平均功率一定的情况下,峰值功率主要取决于调制频率和脉冲宽度。这使得脉冲宽度的调节具有一定的实际应用价值。对调Q掺铥双包层光纤激光器进行研究,首先确定了激光器的最佳输出透过率,在65%最佳透过率时,得到2 m激光的输出功率3.9 W,斜率效率为31%。外接一个信号发生器,信号门宽从12 s变化到18 s,并测量了调制频率分别在30 kHz、40 kHz和50 kHz时输出脉冲宽度的变化情况,得到了555.6 W的最高峰值功率,实现了脉冲宽度从163.4 ns到207.9 ns的变化。实验情况证实了用外接信号发生器能有效控制激光器的输出脉冲宽度。     

全固态单纵模脉冲Nd:YVO_4环形激光器

设计并研制了全固态调Q脉冲单纵模Nd:YVO4环形激光器。利用880nm激光二极管端面抽运Nd:YVO4晶体,通过四镜环形谐振腔中插入声光调Q晶体、标准具,并优化激光谐振腔的结构,获得了重复频率为200Hz、脉宽为26.6ns的单纵模脉冲1.064μm激光输出。当泵浦功率为15 W时,单纵模激光输出的单脉冲能量为570μJ、脉冲能量稳定性优于3%。     

Efficient corner-pumped Nd:YAG/YAG composite slab laser

A corner-pumped type is a new pumping type in the diode-pumped all-solid-state lasers, which has the advantages of high pump efficiency and favourable pump uniformity. A highly efficient corner-pumped Nd:YAG/YAG composite slab laser is demonstrated in this paper. The maximal continuous-wave output power of the 1064~nm laser is up to 18.57~W with a slope efficiency and an optical-to-optical conversion efficiency of 44.9{\%} and 39.8{\%}, respectively. Inserting an acousto-optic $Q$-switch in the cavity, the highest average output power of the quasi-continuous wave 1064~nm laser of 6.73~W is obtained at a repetition rate of 9.26~kHz. The experimental results show that a corner-pumped type is a kind of feasible schedules in the design of diode-pumped all-solid-state lasers with low or medium output powers.     

LD-pumped passively Q-switched Nd:YVO4 infrared and green lasers

A laser diode directly end-pumped, passively Q-switched Nd:YVO₄/Cr:YAG laser is presented in this paper. With 600 mW incident pump laser, Q-switched 1064 nm laser with an average power of 138 mW, pulse width of 19.8 ns, repetition rate of 170.1 kHz and peak power of 40.96 W is obtained. When a KTP crystal was inserted into the cavity, Q-switched 532 nm laser with an average power of 56 mW, pulse width of 28.4 ns, repetition rate of 118.2 kHz and peak power of 16.7 W is obtained at last.