报道了一种小时间抖动、高重复频率Nd∶YAG/Cr ⁴⁺∶YAG被动调Q微型激光器。该激光器以808 nm单管激光二极管作为抽运源,基于切割方向为[001]的Cr ⁴⁺∶YAG晶体在一定入射光功率密度下的极化取向特性,采用偏振抽运的方式,使抽运光偏振方向与晶轴方向平行,将Nd∶YAG晶体吸收后剩余的抽运光全部用于漂白Cr ⁴⁺∶YAG晶体该晶轴方向的电偶极子。结果表明,采用偏振抽运的方式,通过优化切割方向为[001]的Cr ⁴⁺∶YAG晶体取向,可以有效减小Nd∶YAG/Cr ⁴⁺∶YAG被动调Q微型激光器输出脉冲时间抖动。

A passively Q-switched Nd∶YAG/Cr 4+∶YAG microchip laser with a low time jitter and a high repetition rate is reported, which uses a single-tube laser diode with a wavelength of 808 nm as the pumping source. Based on the polarization orientation characteristic of a Cr 4+∶YAG crystal with a cutting direction of [001] at a certain incident beam power density, the polarized pumping method is chosen to make the polarization direction of the pumping light parallel to the crystallographic axis direction and all of the residual pumping light after absorption by the Nd∶YAG crystal is used for bleaching the electric dipoles along the crystallographic axis direction of the Cr 4+∶YAG crystal. The results show that the output pulse time jitter of the Nd∶YAG/Cr 4+∶YAG passively Q-switched microchip laser can be effectively reduced with the optimization of the orientation of the Cr 4+:YAG crystal with a cutting direction of [001] when the polarized pumping method is adopted.