We demonstrate a high peak power and high burst energy linear-polarization, narrowband, GHz-adjustable burst-mode fiber-bulk hybrid laser with central wavelength of 1064 nm and its second-harmonic generation. The active modulated burst-mode seed provides the tunability of temporal parameters and the pre-compensation of burst envelope distortion. Three-stage polarization maintained fiber amplifier cascading bulk amplifier promote the burst energy to 4 mJ at a burst duration of 100 ns and intra-burst duty of 50%. To the best of our knowledge, this is the highest reported output energy of burst-mode fiber-bulk hybrid laser with ∼ hundred nanoseconds burst duration. Also, the pre-compensation for rectangular burst envelope is investigated by iteration method. Type I, non-critical phase matching lithium borate (LBO) is employed for second-harmonic generation and 1.8 mJ burst energy is achieved, corresponding to a conversion efficiency of 45%. The 3 dB spectral width of green light at maximal burst energy is 90 pm. The immediate application of this laser system is the generation of high peak power frequency-adaptive microwave.

中文翻译：

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4 mJ 矩形包络 GHz 可调突发模式光纤-体混合激光器和二次谐波产生

我们展示了中心波长为 1064 nm 的高峰值功率和高突发能量线性偏振、窄带、GHz 可调突发模式光纤-体混合激光器及其二次谐波产生。主动调制突发模式种子提供时间参数的可调性和突发包络失真的预补偿。三级保偏光纤放大器级联体放大器在突发持续时间为 100 ns 和突发内占空比为 50% 时将突发能量提升至 4 mJ。据我们所知，这是突发模式光纤体混合激光器报告的最高输出能量，突发持续时间约为 100 纳秒。此外，还通过迭代法研究了矩形突发包络的预补偿。I型，采用非临界相位匹配硼酸锂 (LBO) 进行二次谐波产生，实现了 1.8 mJ 的突发能量，对应的转换效率为 45%。最大突发能量下绿光的 3 dB 光谱宽度为 90 pm。该激光系统的直接应用是产生高峰值功率频率自适应微波。