We report the design and performance of a compact solid-state green laser capable of producing a 300 ps pulse width (PW) at a pulse repetition rate (PRR) of 150 kHz. The green laser was comprised of a thermally bonded [1 1 1]-cut Nd:YAG and [1 1 0]-cut Cr⁴⁺:YAG microchip, a Nd:YVO₄ crystal, and a hydrothermal grey-track resisted KTP crystal, serving as the oscillator, amplifier and nonlinear frequency converter, respectively. The optimal working conditions for efficient laser amplification and nonlinear frequency conversion were studied by numerical solving the rate equations and coupled wave equations, respectively. Experimental setups were constructed thereafter according to the simulated results. Stable single-longitudinal-mode-operated, linearly polarized (LP) pulses with PW of ∼ 350 ps, PRR of ∼ 150 kHz, and polarization extinction ratio > 13 dB were obtained from the oscillator. The average power was boosted from 285 mW to 1.8 W by the amplifier and then frequency doubled to 532 nm with an average power of 970 mW, resulting in a shorter PW of ∼ 300 ps. The long term power stability of 0.63% (rms) was measured in 200 min indicating its great potential for practical Lidar applications. To the best of our knowledge, these results are among the highest PRR from a LP Nd:YAG/Cr⁴⁺:YAG based green laser with PW ≤ 300 ps. The design procedure has also provided an effective way towards the construction of compact solid-state laser systems with oscillation, amplification, and nonlinear frequency conversion units.

我们报告了能够以 150 kHz 的脉冲重复率 (PRR) 产生 300 ps 脉冲宽度 (PW) 的紧凑型固态绿光激光器的设计和性能。绿色激光器由热粘合 [1  1  1] 切割 Nd:YAG 和 [1  1  0] 切割 Cr ⁴⁺ :YAG 微芯片、Nd:YVO ₄晶体和热液灰轨电阻KTP晶体，分别作为振荡器、放大器和非线性变频器。分别通过数值求解速率方程和耦合波动方程，研究了高效激光放大和非线性频率转换的最佳工作条件。之后根据模拟结果构建实验装置。从振荡器获得了稳定的单纵向模式操作的线性极化 (LP) 脉冲，其 PW 为 ~ 350 ps，PRR 为 ~ 150 kHz，极化消光比 > 13 dB。平均功率由放大器从 285 mW 提高到 1.8 W，然后频率加倍到 532 nm，平均功率为 970 mW，从而使 PW 更短，约为 300 ps。长期功率稳定性为 0。在 200 分钟内测量到 63% (rms)，表明其在实际激光雷达应用中的巨大潜力。据我们所知，这些结果属于 LP Nd:YAG/Cr 的最高 PRR⁴⁺：基于 YAG 的绿色激光器，PW ≤ 300 ps。该设计程序还为构建具有振荡、放大和非线性频率转换单元的紧凑型固态激光系统提供了一种有效的方法。