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Diode array pumped, non-linear mirror Q-switched and mode-locked Nd: YVO_4 laser - a good tool for powder SHG measurement

机译:二极管阵列泵浦,非线性反射镜Q开关和锁模Nd:YVO_4激光器-粉末SHG测量的好工具

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摘要

A non-linear mirror consisting of a lithium triborate crystal and a dichroic output coupler are used to mode-lock (passively) an Nd: YVO_4 laser, pumped by a diode laser array. The laser can operate both in cw mode-locked and simultaneously Q-switched and mode-locked (QML) regime. The peak power of the laser while operating in QML regime is much higher but pulses suffers from poor amplitude stability. The incorporation of an acousto-optic modulator as an active Q-switch enhances the stability of the QML pulse envelope. The second-order non-linearity of powdered crystalline urea is conclusively measured with respect to KDP while the laser is operating in passively Q-switched and passively mode-locked regime as well as in actively Q-switched and passively mode-locked regime.
机译:由三硼酸锂晶体和二向色输出耦合器组成的非线性反射镜用于锁模(被动)由二极管激光器阵列泵浦的Nd:YVO_4激光器。激光器可以在连续模式锁模以及同时Q开关和锁模(QML)模式下运行。在QML模式下运行时,激光器的峰值功率要高得多,但是脉冲的振幅稳定性很差。引入声光调制器作为有源Q开关可增强QML脉冲包络的稳定性。相对于KDP,在激光以被动Q开关和被动锁模方式以及主动Q开关和被动锁模方式运行时,相对于KDP最终确定了粉末状尿素的二阶非线性。

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