用预泵浦技术实现Cr4+、Nd3+双掺YAG激光器自调Q可控输出

对LD泵浦Cr⁴⁺、Nd³⁺双掺YAG自调Q激光器进行了研究,在连续泵浦和脉冲泵浦下获得了1.064μm调Q偏振激光脉冲输出,脉冲宽度(FWHM)为30ns,单脉冲能量为0.5μJ.采用直流预泵浦技术使Q开关时间的不确定度从×10ms减小到5μs左右,并使激光Q脉冲重复率从1kHz提高到近17kHz,该方法也同样适用于其它被动调Q激光器.     

LD抽运被动调Q固体激光器的脉冲稳定性

报道了二极管激光抽运Cr,Nd∶YAG被动调Q Nd∶YVO₄ 1064nm激光输出.为了提高被动调Q激光的输出稳定性，谐振腔采用长腔，增益介质位于谐振腔中间位置.实验中获得了稳定的被动调Q激光输出.在最高入射抽运功率为17.5W时，脉冲重复频率达到71.3kHz，脉冲宽度为0.4μs.调Q脉冲幅度不稳定性低于±10%，脉冲时间波动性低于±3.5%.     

用时域ABCD矩阵对调Q锁模激光器的研究

用时域ABCD矩阵讨论了调Q锁模脉冲激光器输出脉冲的宽度和啁啾特性,主要给出了调Q元件作为幅度调制元件时的时域ABCD矩阵,并将光脉冲在激光腔中往返一周的ABCD矩阵写出,用此矩阵讨论了它对锁模脉冲的影响.给出了Nd:YAG激光器中用Cr⁴⁺:YAG作调Q元件时的调Q锁模脉冲激光器特性,并讨论了腔内色散、饱和吸收强度、增益带宽对输出脉冲特性的影响.用时域ABCD矩阵大大简化了计算过程.     

可调谐的调Q掺Yb3+双包层光纤激光器

利用双包层光纤中的受激布里渊散射和声光调Q器件,对掺Yb³⁺双包层光纤激光器进行了混合调Q的实验研究.在连续泵浦状态下,当入纤泵浦功率为1.24W时,在1080～1119nm的可调谐范围内,在国内首次获得了输出脉冲宽度小于6ns,重复频率1.5 kHz,脉冲能量高于80μJ,峰值功率高于13.3kW稳定调Q光纤激光器的脉冲输出.经计算,实验结果和理论计算值符合得很好.     

激光调Q CAI

从激光调Q速率方程出发,分析推导了激光调Q过程中,腔内光子数与工作物质内反转粒子数间的关系.再根据激光调Q的过程中,对腔Q值控制方式不同,将激光调Q技术分为:转镜调Q、声光调Q、电光调Q、饱和吸收调Q和脉冲透射式调Q.用C语言进行了激光调Q CAI软件的开发研制,获得了将文学、图形、动画和计算融为一体的,直观而生动地将调Q的理论和过程再现于屏幕的CAI课件.介绍了课件的内容、结构及其特点.     

腔内光强空间分布对被动调Q激光器速率方程解的影响

在被动调Q激光器速率方程中考虑腔内光强的高斯分布,数值求解该速率方程所得的理论结果比采用平面波近似所得的理论结果更接近于Cr⁴⁺:YAG调QNd³⁺:YAG激光器的实验结果.     

抗共振环稳定被动调Q 激光的作用

本文从理论出发,分析抗共振环(Anti-ResonantRing-ARR)稳定调Q 激光脉冲的作用.将新型调Q晶体Cr⁴⁺:YAG置于ARR中心,在平-ARR介稳腔中获得能量起伏0.34%的高稳调Q单脉冲输出.     

窄线宽线形腔调Q双包层掺钕光纤激光器

对LD泵浦调Q双包层掺Nd³⁺光纤激光器进行了实验研究.在Littrow结构的体光栅与二向色镜构成的线形腔结构中,利用声光Q开关(AQM)调Q,在1064nm得到了光谱线宽约为0.08nm稳定的激光脉冲序列.脉冲重复频率从1kHz到10kHz可调.在重复频率1kHz时得到脉冲宽度约800ns,最大单脉冲能量180μJ,脉冲峰值功率225W,激光平均功率180mW,并对激光输出脉冲能量进行了计算,计算结果与实验符合很好.     

全光纤调Q掺铒光纤激光器的脉冲研究

报道一种全光纤调Q掺铒光纤激光器,在其结构中采用带有光纤光栅的光纤环形镜作为调Q装置此调Q方案同时具有对腔内损耗进行调制和对激光输出波长选择的功能理论上分析了不同臂长差时的脉冲出现情况,与实验基本相符并对激光单脉冲产生及稳定性进行了分析讨论.     

低阈值高效率新型晶体Nd:Sr5(PO4)3F腔内倍频研究

采用氙灯泵浦新型晶体Nd:Sr₅(PO₄)₃F,以KTP晶体腔内倍频,实现了该晶体0.5295μm绿光激光BDN染料片调Q运转。测量了输出绿光激光的特性及不同腔长和染料片小信号透过率情况下的输出能量及脉冲宽度,给出了染料片调Q腔内倍频的耦合波方程组,数值求解该方程组,所得的理论数据与实验结果较好地相符。     

High Average Power, Compact Passively Q-Switched 532 nm Green Laser on Nd:YAG/Cr4+:YAG Composite Crystal

We design a passively Q-switched intracavity frequency-doubled 532 nm laser using Nd:YAG/Cr⁴⁺:YAG composite crystal and type II phase matching KTP crystal. Under 13.97 W pump power, the average output power of the laser elaborated is up to 681 mW, with 200 ns pulse width and 9.1 kHz pulse repetition rate.     

Diode-pumped passively Q-switched YAG/Yb:YAG laser with Cr4+:YAG as a saturable absorber

We design an efficient passively Q-switched laser using a composite YAG/Yb:YAG crystal as the laser gain medium and a Cr⁴⁺:YAG crystal as a saturable absorber. We obtain an average output power of 1.81 W in 1030 nm laser at an absorbed pump power of 4.8 W, corresponding to an optical-to-optical efficiency of 37.7% and a slope efficiency of 47.3%. The pulsed laser has a repetition rate of about 28.6 kHz and a pulse width of 15.8 ns, with the highest peak power of 4 kW. In addition, using a LBO as the intracavity frequency doubler, we obtain a maximum power of 246 mW in 515 nm pulsed laser at an absorbed pump power of 3.8 W.     

High-Power passively Q-switched 532 nm green laser by using Nd:YAG/Cr4+:YAG composite crystal

This paper reported a passively Q-switched 532 nm green laser of LD pumped V cavity structure by using Nd:YAG/Cr⁴⁺:YAG composite crystal and the type II phase matching KTP crystal. Under 19.4 W pump power, the average power of the laser pulse up to 1.83 W, with the pulse width of 93.2 ns and repetition frequency of 9.1 kHz.     

Narrow pulse width and high power passively Q-switched Nd3+:Gd3Ga5O12 laser with Cr4+:YAG saturable absorber

A compact, diode-pumped passively Q-switched Nd³⁺:Gd₃Ga₅O₁₂ (Nd:GGG) laser with Cr⁴⁺:YAG saturable absorber has been successfully demonstrated. Stable Q-switched pulses with pulse energy of 100 ??J and high peak power of 14 kW have been obtained. The pulse width was as short as 7 ns with low repetition rate of 10 kHz. The dependence of pulse width, pulse repetition rate, pulse energy and pulse peak power on pump power have been measured respectively. Experimental results reveal that the Nd:GGG crystal with Cr⁴⁺:YAG saturable absorber is suitable for narrow pulse width and high power passively Q-switched lasers.     

Doubly <Emphasis Type="Italic">Q</Emphasis>-Switched Nd:YAG Ceramic Laser

Using simultaneously both an acousto-optic (AO) modulator and a Cr⁴⁺:YAG saturable absorber in the cavity, we demonstrate for the first time the performance of a diode-pumped doubly Q-switched Nd:YAG ceramic laser. In contrast to purely acousto-optic Q-switched laser, this doubly Q-switched laser can generate shorter and more symmetric pulses. At an absorbed pump power of 10 W and a repetition rate of 20 kHz, the pulse width is compressed to 30 and 25 ns, respectively.     

不同脉冲重复频率下抽运方式对全光纤声光调Q激光器性能的影响

在不同初始边界条件下数值求解描述全光纤声光调Q双包层光纤激光器的速率方程,得到前向抽运结构和后向抽运结构下激光器上能级粒子数在增益光纤中的分布,以及脉冲能量、平均功率、脉宽、光纤中储能与脉冲重复频率、抽运合束器对信号光透过率、抽运功率的相互关系.从谐振腔内放大自发辐射光的产生影响谐振腔损耗的角度分析仿真结果,并实验验证两种抽运方式对输出脉冲功率和脉冲宽度的影响.结果表明：不同脉冲重复频率下抽运方式会对全光纤声光调Q激光器性能产生显著影响,为获得较好的脉冲输出性能,在重复频率较低 关键词： 光纤激光器 Q')" href="#">声光调Q 抽运方式     

Diode-Side-Pumped Passively Q-Switched Mode-Locked 532 nm Laser with a Nd:YAG/Cr4+:YAG/YAG Composite Crystal

We present a diode-side-pumped Q-switched mode-locked (QML) laser operating at 532 nm for the first time employing a composite crystal Nd:YAG/Cr⁴⁺:YAG/YAG and a KTP. The experimental results show that, using a suitable cavity and crystals, one can obtain high-quality QML laser output at 532 nm with a side-pumped system. We measure and analyze the QML performance of the fundamental frequency laser and the green laser. Under a pump power of 127 W, we obtain a QML laser operating at 532 nm with an average power of 4.97 W and a repetition rate of 0.2 GHz for the mode-locked pulses; the corresponding depth of modulation is close to 100%.     

Theoretical and experimental studies on passively Q-switched KTiOAsO4 optical parametric oscillator

A passively Q-switched intracavity optical parametric oscillator based on KTiOAsO₄ (KTA) crystal is studied theoretically and experimentally. The rate-equation-based theoretical model is established to describe the time evolutions of the population inversion density of the laser crystal, ground-state population density of the saturable absorber, fundamental photon density, signal photon density and the idler photon density. In the experiment, a laser diode-end pumped, passively Q-switched Nd:YAG/KTA IOPO with a Cr⁴⁺:YAG crystal as the saturable absorber is realized to verify this model. The characteristics including the output power, the pulse repetition rate, the pulse width and the beam quality were investigated for this OPO. The experimental results for the output power and the repetition rate agree with the theory well. And both results show that with same pumping level the idler pulse width is shorter than the signal one.