Nd:YAG/Cr~(4+):YAG/YAG键合晶体调Q激光输出特性研究

对激光二极管端面抽运Nd:YAG/Cr~(4+):YAG/YAG键合晶体的1 064nm被动调Q激光性能进行了研究.对比分析了Cr~(4+):YAG晶体初始透过率分别为84.9%和90.6%的调Q激光输出特性,以及不同耦合输出镜透过率对调Q性能的影响.结果表明,在特定抽运功率下,各输出特性参数的优化(高输出功率,高重复频率,窄脉冲宽度)分别对应一个最佳的输出镜透过率;随着抽运功率增加,对应最佳的输出镜透过率越大.对比两种初始透过率的Cr~(4+):YAG晶体对应的激光输出特性,84.9%初始透过率的晶体获得相对较低的平均输出功率,但相应的重复频率较小,脉冲宽度窄,使得调Q激光的峰值功率明显提高.采用30%透过率的耦合输出镜和10.4 W入射抽运功率下,获得了3.2 W平均输出功率、9.7ns脉冲宽度和52kHz重复频率的激光输出,经计算可知峰值功率达6.3kW.     

双通道电光调Q射频激励波导CO2激光器研究

报道了双通道可调谐电光调Q射频激励波导CO2激光器,其中一通道是光栅选支电调Q的脉冲激光输出,调Q脉冲重复频率1Hz-10kHz可调,,脉冲峰值功率为150W,脉冲宽度为180ns,另一通道是光栅选支连续激光输出,可用压电陶瓷调节激光频率,同时分析了激光外差频率调谐范围,实验上获得最大脉冲激光外差频率调谐范围为150MHz。     

调Q脉冲保偏光纤激光器的研究

以808nm半导体激光器为抽运源,掺钕双包层保偏光纤为增益介质,对调Q脉冲保偏光纤激光器进行了理论分析和实验研究.利用TDS5104型示波器探测输出脉冲激光的波形,并用光谱分析仪得到输出脉冲激光的光谱图.利用F-P腔型,在1060nm处获得平均功率为2.55W的脉冲激光输出,重复频率为1kHz时,输出单脉冲能量为2.3mJ,峰值功率为4.7kW.改变腔型,把二色镜倾斜放置兼作输出镜,最终获得了平均功率为3.5W的偏振脉冲激光输出,重复频率为1kHz时,输出单脉冲能量为3.3mJ,脉冲宽度为184ns,其峰 关键词： 激光技术 光纤激光器 掺钕保偏光纤 调Q     

大功率LD抽运的Cr^4＋：YAG被动调Q Nd：YVO4激光器

在LD端面抽运的Nd：YVO4激光器中插入Cr^4＋：YAG晶体,获得了稳定的1．06μm波长的高重复率被动调Q脉冲激光输出。实验研究了抽运功率、腔长、输出镜透过率对输出功率的影响,以及不同抽运功率下脉冲重复频率和脉冲宽度的变化,并对结果进行了理论分析。当腔长为8cm,抽运功率为27W时,得到重复率37．8kHz、平均功率3．5W的调Q脉冲序列;单个脉冲能量为93μJ、脉宽为24ns、峰值功率为3．9kW。     

LD抽运Cr~(4 )∶YAG高重复率被动调QNd∶YVO_4激光器

采用Cr4 ∶YAG晶体作为可饱和吸收体,实现连续激光二极管(LD)端面抽运的Nd∶YVO4激光器的高重复率被动调Q·在注入抽运功率为8.8W时,得到重复频率23.8kHz、平均功率1.21W的调Q脉冲序列;每个脉冲能量为51μJ、脉宽为25ns、峰值功率达到2.03kW·实验上研究了脉冲重复频率、平均输出功率、脉冲宽度、单脉冲能量与抽运功率、输出镜透过率的关系·实验结果表明,当抽运功率较大时,脉冲重复频率和输出平均功率随着抽运功率的增加而减小,对此进行了合理的理论解释·     

LD抽运Cr4+∶YAG高重复率被动调Q Nd∶YVO4激光器

采用Cr4+∶YAG晶体作为可饱和吸收体，实现连续激光二极管（LD）端面抽运的Nd∶YVO4激光器的高重复率被动调Q.在注入抽运功率为8.8 W时，得到重复频率23.8 kHz、平均功率1.21 W的调Q脉冲序列；每个脉冲能量为51 μJ、脉宽为25 ns、峰值功率达到2.03 kW.实验上研究了脉冲重复频率、平均输出功率、脉冲宽度、单脉冲能量与抽运功率、输出镜透过率的关系.实验结果表明，当抽运功率较大时，脉冲重复频率和输出平均功率随着抽运功率的增加而减小，对此进行了合理的理论解释.     

被动调Q激光器输出特性的实验研究

被动调Q晶体Cr∶YAG对激光器的性能起着重要的作用。对Cr∶YAG被动调Q Nd∶YAG激光器进行了实验研究。着重研究了抽运功率、腔长、输出镜透过率以及初始透过率等因素对激光输出脉冲序列的重复率、脉冲宽度以及输出功率的影响。实验结果表明，抽运功率是影响重复率的最大因素，抽运功率的增大可以提高重复率，并减小脉冲宽度；它对腔长的影响效果刚好相反；存在一个可使输出功率最大的最佳输出镜透过率；不同的初始透过率对输出有一定的影响。分析表明被动调Q技术适用于DPL。     

LD连续泵浦Nd:YVO4声光调Q激光器

 利用半导体激光器（LD）连续单端泵浦Nd:YVO₄晶体，实现了声光调Q输出1 064nm的短脉冲。分析并用实验验证了不同透过率输出耦合镜及不同重复频率条件下，输出调Q脉冲能量、脉冲宽度及平均输出功率的规律。在泵浦功率为20.7W，重复频率为50kHz时，获得了最大平均输出功率为5.72W的脉冲，光 光转换效率为28%，斜效率为32.4%；在重复频率为10kHz时，最大单脉冲能量为0.286mJ，脉宽为22ns，峰值功率为13kW。     

激光二极管抽运Tm,Ho∶YLF晶体声光调Q激光器

对激光二极管端面抽运Tm,Ho∶YLF晶体声光调Q激光器的激光特性进行了研究。根据粒子跃迁和能量传递过程,在考虑能级传递上转换的前提下,建立了Tm,Ho∶YLF脉冲激光器的速率方程,得到了初始反转粒子数的解析表达式,分析了能量传递上转换效应对激光上能级反转粒子数的影响。在室温下实现了2 μm波长激光的脉冲输出。实验上给出并分析了Tm,Ho∶YLF脉冲激光器的平均输出功率、单脉冲能量和脉冲宽度随抽运功率以及声光Q开关调制频率的变化关系。在抽运功率为2.8 W,重复频率为9 kHz时,获得了平均输出功率为189 mW的激光脉冲,光光转换效率为6.8%。在重复频率为1 kHz时,得到最大单脉冲能量为65 μJ,峰值功率为0.17 kW。     

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.     

A novel high-peak power double AO Q-switches pulse Nd:YAG laser for drilling

This paper reports on the characterization and analysis of a novel high power with double acousto-optical (AO) Q-switch pulse laser. It is shown that two AO Q-switches, in which acousto-fields are perpendicular to each other, switch-loss is nearly three times larger than one AO Q-switch, one time larger than the two AO Q-switches in which acousto-field are parallel. The laser pulse bursts, with 5–50 kHz repetition rate of the burst, typically 200 ns duration, 400 kW the peak power, 5 mm mrad beam parameter product, are obtained. Using the laser for drilling, the perfect drilling results are given to a thinner recast layer.     

High repetition rate,high peak power acousto-optical Q-switched 946 nm Nd:YAG laser

A diode-end-pumped high repetition rate, high peak power acousto-optical (AO) Q-switched 946 nm Nd:YAG laser was demonstrated in this paper. In our experiments, a 20 mm miniature acousto-optical Q-switch was employed in a 45 mm linear laser cavity for generating the short laser pulse. At a repetition rate of 10 kHz, a maximum average output power of 2.9 W was achieved with a pulse width of 24.4 ns, giving a peak power of 11.9 kW. To the best of our knowledge, this is the highest peak power 946 nm Nd:YAG laser at high repetition rate operation. Moreover, pulse train with good stability was also obtained at the repetition rate of 50 kHz. At an incident pump power of 22.3 W, up to an average output power of 3.5 W pulsed 946 nm laser was generated at 50 kHz with a pulse width of 69 ns, corresponding to an optical conversion efficiency of 15.7% and an average slope efficiency of 24.1%, respectively.     

Continuous wave and AO Q-switch operation of a b-cut Tm,Ho:YAP laser with dual wavelengths pumped by a laser diode of 792 nm

Continuous wave (CW) and AO Q-switch operation of a b-cut Tm,Ho:YAP laser with dual wavelengths were reported in this paper. In the temperature of 77 K, the b-cut Tm,Ho:YAP crystal was double endpumped by a 7.21-W fiber-coupled laser diode (LD) at the center wavelength of 792 nm. A 1.17-W Q-switch output power was acquired at pulse repetition frequency (PRF) of 10 kHz, corresponding to an effective optical-optical conversion efficiency of 25.9% and an effective slope efficiency of 31.5%. The energy per pulse of 0.46 mJ in 100 ns was achieved at 2.5 kHz with the peak power of 4.6 kW.     

Comparison of electro-optical and acousto-optical Q-switched,high repetition rate Nd:GdVO<Subscript>4</Subscript> laser

The differences between the performances of electro-optical (EO) and acousto-optical (AO) Q-switched, diode pumped Nd:GdVO₄ laser at high repetition rates were detailed in this paper. The results revealed that EO Q-switch was more favorable to obtain short pulse width and high peak power laser than AO Q-switch under high repetition rate operation. The minimum pulse widths at 100 kHz were 20.2 ns under EO operation and 28.7 ns under AO operation, corresponding to peak powers of 3.1 kW and 2.2 kW, respectively. The corresponding values at 10 kHz were 5.3 ns, 9.0 ns and 77.4 kW, 45.6 kW, respectively.     

高峰值功率中红外2.8μm脉冲光纤激光器

采用中心波长为975nm半导体激光器泵浦高掺铒氟化物双包层光纤Er∶ZBLAN,并在谐振腔内插入主动调Q元件,获得了工作频率为1~10kHz的2.8μm激光主动调Q脉冲输出.在工作频率为10kHz条件下,获得了最大单脉冲能量为134.5μJ、脉宽为127.3ns、峰值功率为1.1kW的脉冲输出.     

小型多功能CO2激光器

研制了一种小型多功能CO2激光器。该激光器可以单脉冲、重频或连续方式输出,并可实现输出脉冲频率的编码及波长调谐。激光器谐振腔采用光栅一级振荡,零级输出的工作方式,分别利用声光调Q技术和脉冲放电技术实现了百ns至亚ms量级的脉冲激光输出。详细介绍了该激光器中基于光学角反射器原理设计的光栅调谐定向输出装置,并对其进行了理论计算和论证,实现了不同波长激光的定向、定位输出,获得调谐激光输出谱线超过60条,谱线分辨率优于0.01μm。激光器脉冲重复频率1Hz～10KHz连续可调,输出波长调谐范围9.2μm～10.8μm,激光器连续输出最大功率8W,重复频率1KHz时最小激光脉宽180ns,峰值功率4062W。该激光器在激光与物质相互作用科学领域,特别是激光对物质作用与破坏机理的研究方面具有重要的应用价值。     

新型电光陶瓷调Q光纤激光器

报道了基于OptoCeramic(R)电光陶瓷材料的新型调Q光纤激光器.采用976 nm半导体激光器作为抽运源,电光陶瓷调制器作为Q开关,峰值吸收系数1200 Db/m的高掺杂镱纤作为增益介质构成环形腔激光器.增益光纤的高掺杂浓度使得激光器的腔长得到缩短,输出光脉冲的宽度得到压缩.通过调节电光元件的电压,控制材料的折射率,调节谐振腔的损耗,实现Q开关作用.实验中通过改变腔长、抽运功率和重复频率,研究了脉冲的输出特性.获得最窄脉宽104 ns,重复频率3～40 kHz连续可调的调Q脉冲输出.     

中间镜式半导体可饱和吸收镜在Nd∶YVO4激光器中被动调Q特性研究

利用一种新型的中间镜式半导体可饱和吸收镜,成功实现了二极管泵浦Nd∶YVO4激光器调Q运转,获得的最短脉冲宽度为8.3 ns,最大平均输出功率为135 mW,重复频率在400 KHz到2 MHz之间.利用这种吸收体被动调Q得到的重复频率大大高于所知的大多数吸收体所进行的被动调Q的重复频率.     

Diode-pumped green Nd:YAG laser with Q-switch and mode locking

We propose a new method for achieving simultaneous operation of laser mode locking and the Q-switch technique using only a single acousto-optic modulator (AOM) with a traveling wave; this AOM was placed inside the cavity of a green-emission Nd:YAG laser. The further shortening of the lasing pulse duration from 40 ps to less than 3.25 ps was obtained by the formation of a Kerr lens in a doubling-frequency crystal. At average output power of 1.5 W and pulse repetition rate of the Q-switch equal to 2 kHz, the peak power in a steady-operating laser exceeded 50 MW.     

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.