铒玻璃激光被动Q开关实验研究

报道了一种适用于铒玻璃的Co2+:Al2O3 可饱和吸收体Q开关,用这种开关进行了调Q实验.在注入21J时,获得10mJ输出,脉宽为85ns.     

LD泵浦铒镱共掺磷酸盐玻璃被动调Q微型激光器实验研究

1.5 m LD泵浦铒玻璃被动调Q微型激光器是目前军事激光测距的研究热门,获得较高的激光单脉冲能量尤为重要。对以波长为940 nm的二极管激光器作为泵浦源,Er3+/Yb3+共掺磷酸盐玻璃作为增益介质,Co2+:MgAl2O4作为调Q晶体的微型化激光器进行了实验研究。为获得LD抽运铒镱共掺磷酸盐玻璃被动调Q微型激光器的最佳能量输出条件,分析了影响LD泵浦被动调Q激光器输出单脉冲能量的因素,并对影响被动调Q微型激光器输出能量的泵浦条件,增益介质长度,输出镜反射率等参数进行了多组实验优化,最终获得了波长1.535 m,单脉冲能量113 J,脉宽6 ns,重复频率10 Hz,光束质量为1.2的稳定人眼安全激光输出。     

用Q开关铒激光器蚀刻角膜的研究

为了对Ｑ开关铒激光器用于角膜整形进行评估,并对激光输出参数进行优化,我们对巨脉冲与角膜组织相互作用的某些方面进行了研究。我们的兴趣集中于蚀刻速率、热组织损伤与激光作用下瞬时压力之间的关系。蚀刻速率的测量通过利用蚀刻碎片反弹引起的瞬时压力来完成。实验装...     

利用SBS进行调Q的铒玻璃激光器工作特性研究

用ＳＢＳ进行调Ｑ 的理论模型,针对铒玻璃激光器进行了研究。数值模拟了其工作特性,调Ｑ 后其输出光脉冲宽度约２０ｎｓ。     

利用SBS调Q的铒玻璃激光器模型

文章在前人的工作基础上,建立了适合于研究用受激布里渊散射（ＳＢＳ）进行调Ｑ的铒玻璃激光器的理论模型。利用该模型可以研究激光器的输出功率、脉冲宽度等特性。     

发展中的LD抽运调Q铒玻璃激光器

介绍了二极管抽运调Q铒玻璃激光器的发展过程、发展水平和发展趋势,主要包括:铒玻璃激光材料、调Q技术、抽运系统。铒玻璃材料向高离子掺杂浓度方向发展;双侧面对称抽运方式可以提高抽运效率的同时还可以减少材料的热畸变;Co2+:MgAIO4晶体发展为最合适的被动调Q材料;激光器高重频运转需要精确的温度控制。最后,探讨了该课题进一步发展要解决的问题。     

被动Q开关的微型DPL技术研究

被动Q开关是实现脉冲工作DPL微型化最有效的手段之一.文中介绍了Cr4+:YAG晶体被动Q开关激光器的基本原理,在实验中采用CW5W的LD端面泵浦的Nd:YAG/Cr4+:YAG激光器实现了重频高达5kHz、单脉冲能量40 μJ、脉冲宽度5.9 ns的稳定单纵模激光输出,并研制成微型化样机.     

固体激光器被动Q开关技术的进展

本文综合论述了固体激光被动调Ｑ技术的现状与相关材料的进展。注要有用于１μｍ波段的各种被动的调Ｑ技术以及用于１．５４μｍ及２μｍ波段的各种最新被动调Ｑ技术。     

硫化铅被动Q开关掺铒玻璃激光器

以掺有硫化铅(PbS)量子点的磷酸盐玻璃作为内腔可饱和吸收体,国际激光中心(白俄罗斯,明斯克)和圣彼得堡立光技术大学(俄罗斯,圣彼得堡)的科学家已实现1.54 μm闪光灯抽运掺铒玻璃激光器的被动Q开关。以6 nm PbS量子点的最低能量量子束缚跃迁的饱和,研究组产生了110 ns脉宽的Q开关脉冲,无需内腔聚焦元件。无防反涂层0.8 mm厚的Q开关在1.54 μm处的小信号透过率接近81%。腔长为170 mm的激光器由曲率半径为200 mm的高反凹面镜和在发射波长处反射率为78%的平面输出耦合器组成。激光棒为掺铒的镱铬磷酸盐玻璃,其铒离子浓度为1.6×1019/cm3, 1.54 μm处的发射截面为7×10-21 cm2。 PbS可饱和吸收体放在增益媒质和凹面反射镜之间,这样无需内腔聚焦元件就能产生Q开关脉冲。     

磷酸盐钕玻璃激光器中被动调Q的研究

建立了包含磷酸盐钕玻璃激光增益介质 ,Cr4 +∶YAG被动调Q晶体和谐振腔参数的速率方程组 ,计算得到调Q脉冲波形。计算了脉冲三通放大波形。实验证实了计算结果的正确性。     

Nd: Sr5 (PO4) 3F Crystal Laser Characteristics Using GaAs as Passive Q-switch

It is investigated the properties of a diode-pumped Nd: Sr5 ( PO4 )3F laser that is passively Q-switched by a thin, single crystal GaAs wafer. The short high-peak-power pulses of the laser have been obtained. The pulse energies, pulse widths and pulse repetition rates for different conditions have been measured and the experimental results show that GaAs is an excellent passive Q-switch of the diode-pumped Nd: Sr5(PO4)3F lasers.     

Cr~(4 ):YAG被动调Q的单向环形腔Nd:YAG激光器研究

介绍了利用辅助镜的ＮｄＹＡＧ单向环形腔,并利用Ｃｒ４＋ＹＡＧ晶体作为可饱和吸收被动调Ｑ器件。对环形腔的设计进行了分析,并对利用不同初始透过率的Ｃｒ４＋ＹＡＧ晶体作为调Ｑ器件所获得的脉冲序列进行了测量,对结果进行了初步分析     

NYAB晶体Cr~(4 ):YAG被动调Q的激光特性研究

采用氙灯泵浦,Ｃｒ４＋ＹＡＧ被动调Ｑ,实现了自倍频晶体ＮＹＡＢ调Ｑ激光运转,测量了Ｃｒ４＋ＹＡＧ不同小信号透过率及不同泵浦能量下绿激光单脉冲的输出能量、脉冲宽度、重复率,给出了描述ＮＹＡＢ晶体Ｃｒ４＋ＹＡＧ调Ｑ工作原理的耦合波方程组,数值求解该方程组所得的理论结果与实验值相符。     

Ti:sapphire Laser Pumped Yb:YAG Laser with Cr4+:YAG as a Passive Q-switch

The Ti: sapphire laser pumped Yb: YAG passively- Q- switched laser with Cr4 +: YAG as a saturable absorber experiment was performed. The Mira 900 tunable Ti:sapphire laser with an output power up to 1 W was used as a pump source. The optical pump system was composed of a spherical lens (f = 75 mm) for focusing the pump beam to a circular spot with a diameter of about 50μm, the pumping power was measured to be up to 920 mW. The laser cavity was configured to be semispherical, and was formed by the 50 mm curvature radius mirror Mi and the flat mirror M2. Mirror Mt, one face was coated for high transmission at 940 nm and the other face was coated for total reflection at 940 nm and 1.03 μm, was placed on the front of the input facet of the Yb: YAG crystal. The Yb: YAG gain medium is doped with 20 at. - ％ Yb3+, no concentration quenching of the upper-state lifetime has been observed in this crystal. The Yb: YAG gain element is 8 × 8 × 0.5 mm3 thick and is polished flat and paralld. It is coated on one face of the crystal for high transmission at 940 nm and at 1030 nm, the other surface of the crystal is coated for total reflection at 940 nm and at 1030 nm. Mirror M2 was coated for total reflection at 940 nm and reflectivity of 97％ at 1.03 μm acting as an output coupler. The overal cavity length is 23 cm. More than 90％ of the laser pumping power was absorbed by the Yb: YAG crystal. The laser operation was performed at 278 K by using the constant-temperature water-cooled circulation with a copper surface. The Cr4+: YAG saturable absorber was placed tightly dose to Yb: YAG sample. This provided a train of pulsesat 1.03 μm with a pulse duration (FWHM) decreasing from 0.6 μs to 0.4 μs and a repetition rate increasing from 20 kHz to 50 kHz. The maximum average power of 53 mW is attained when the pmping power is 730 mW. The slope efficiency is about 16％.     

采用声光Q开关调制的脉冲Nd：YAG激光器

采用声光调制器（AOM）对脉冲Nd:YAG激光进行腔内调制，提高激光脉冲的峰值功率。获得了脉宽200ns的激光脉冲列，脉冲列的重复频率为5-50kHz，脉冲能量为30－80mJ，最大脉冲峰值功率为400kW，光束质量为3mm mrad。     

可调谐Cr：LiSAF激光器的调Q晶体腔内位置的选择

本文通过对电光调Q Cr:LiSAF可调谐激光器的KD^*P晶体的腔内三个可能的位置的分析,证明了它们均可以作为调Q晶体的腔内位置。     

Q-switch regime of 3-μm Er:YAG lasers

A mathematical model, based exclusively on spectroscopic data concerning radiative, nonradiative, and energy transfer processes, is proposed and used to simulate the Q-switch regime of a 3-μm Er:YAG laser. The connection between the main energy transfer mechanisms that make possible generation on the self-saturated transition ⁴I _11/2→⁴I_13/2 (upconversion from ⁴I_13/2 and ⁴I_11/2 and cross relaxation from ⁴S_3/2) and the giant pulse characteristics are discussed. The radiative as well as nonradiative losses during optical pumping and giant pulse generation are defined and evaluated. A particular attention is given to the frustrated total internal reflection (FTIR) Q-switch which demonstrated real qualities for 3-μm erbium lasers. The reasons responsible for experimental performances of Q-switched Er:YAG lasers inferior to those predicted by the mathematical modeling are analyzed     

用增益孔径改善被动调Q短腔激光器近场的实验

采用实验研究的方法, 对利用增益孔径改善小型激光二极管(LD)端面抽运被动调Q短腔激光器近场的方法进行了验证, 并研制了一台具有高稳定性、准高斯分布近场和光滑时间波形输出的小型非一体式LD端面抽运激光器。该激光器是实现小型化激光测距仪的关键单元, 采用新颖的二极管抽运的增益开关被动调Q短腔键合YAG设计, 由增益孔阑实现选模, 保证光束质量; 由短腔和Cr4+：YAG调Q保证单纵模运转和短脉宽输出; 由增益开关保证小的调Q抖动。激光器输出的近场质量证明了利用增益孔径可对此类激光器的近场进行有效的主动控制。     

双声光器件调制的同步性对Nd:YAG脉冲激光输出的影响

在脉冲Nd：YAG激光器的谐振腔内,用最大输出功率为120W的声光电源,同时驱动2个正交放置的器件,进行声光调制。实验研究了2个声光器件不同的开启时间对激光脉冲输出的影响。研究结果表明,双声光器件的开启时间的同步性对激光输出脉冲有较大的影响,当两器件开启时间差大于5ns时,声光器件不能对调制光进行有效关断;当两器件的开启时间大于18ns时,有效调制输出的激光脉冲能量下降了20％。