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首页> 外文会议>SPIE Conference on Solid State Lasers >Cavity length dependence of mode beating in passively Q-switched Nd-solid state lasers
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Cavity length dependence of mode beating in passively Q-switched Nd-solid state lasers

机译：腔体长度依赖性模式在被动Q开关的ND-固态激光器中跳动

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The temporal intensity profile of pulse(s) from passively Q-switched and passively Q-switched mode locked (QSML) solid-state lasers is known to be dependent on cavity length. In this work, the pulse width, modulation depth, and beat frequencies of a Nd:Cr:GSGG laser using a Cr~(+4):YAG passive Q-switch are investigated as function cavity length. Measured temporal widths are linearly correlated with cavity length but generally 3-5 ns larger than theoretical predictions. Some cavity lengths exhibit pulse profiles with no modulation while other lengths exhibit complete amplitude modulation. The observed beat frequencies at certain cavity lengths cannot be accounted for with passively QSML models in which the pulse train repetition rate is τ_(RT)~(-1), τ_(RT)= round-trip time. They can be explained, however, by including coupled cavity mode-locking effects. A theoretical model developed for a two section coupled cavity semiconductor laser is adapted to a solid-state laser to interpret measured beat frequencies. We also numerically evaluate the temporal criterion required to achieve temporally smooth Q-switched pulses, versus cavity length and pump rate. We show that in flash lamp pumped systems, the difference in buildup time between longitudinal modes is largely dependent on the pump rate. In applications where short pulse delay is important, the pumping rate may limit the ability to achieve temporally smooth pulses in passively Q-switched lasers. Simulations support trends in experimental data. Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of Energy's National Nuclear Security Administration under contract DE-AC04-94AL85000.
机译：从被动Q开关和被动Q开关模式脉冲的时间强度曲线（S）锁定（QSML）固体激光器被称为是依赖于腔长度。在这项工作中，脉冲宽度，调制深度，并拍频钕的：铬：使用Cr〜GSGG激光器（4）：YAG被动Q开关被研究作为功能腔长度。测量的时间宽度线性腔长度相关，但一般为3-5纳秒比理论预测大。一些腔长度表现出脉冲轮廓与无调制而其它长度表现出完全的调幅。在某些腔长度所观察到的拍频不能与被动QSML模型，其中所述脉冲串的重复率是τ_（RT）被考虑〜（-1），τ_（RT）=往返时间。它们可以了说明，通过包括耦合腔锁模作用。对于两个部分耦合腔半导体激光器开发的理论模型适于固态激光器来解释测量的拍频。我们还评估数值以实现在时间上平滑的Q开关脉冲，相对于腔的长度和泵速率所需的时间准则。我们表明，在闪光灯泵浦系统，在纵向模式之间的累积时间差，在很大程度上取决于泵的速度。在短脉冲延迟是很重要的应用中，泵送速率可能限制以实现在时间上平滑被动Q开关激光器的脉冲的能力。支持模拟实验数据的趋势。 Sandia National Laboratories是由Sandia Corporation，Lockeed Martin Corporation的全资子公司，美国能源部核安保期间的桑迪亚公司管理和运营的多项计划实验室，该公司在合同DE-AC04-94AL85000下提供了美国能源国家核安全管理部。

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