基于反射式布拉格光栅和Fabry-Perot标准具组合的Nd∶YVO4单频激光器

Single-Frequency Nd∶YVO4 Laser Based on Reflective Bragg Grating Combined with Fabry-Perot Etalon

报道了一种激光二极管端面连续抽运的稳定单频主动调Q Nd∶YVO4激光器。采用RBG与标准具组合的方式获得了稳定的高功率单频激光输出。RBG既作为输出耦合镜,又作为纵模选择元件,与标准具组合可进一步抑制多纵模,增长谐振腔的光学腔长,获得高功率输出。通过优化标准具的倾斜角度,可使标准具与RBG的中心波长匹配,并减小腔内插入损耗。最终在物理腔长为148.7mm的条件下,获得了功率为750mW,脉冲能量为75μJ@10kHz,脉宽为8.3ns的稳定的高功率单频激光输出。

This study reports on a stable single-frequency active Q-switched Nd∶YVO4 laser end-pumped by a continuous-wave laser diode. The stable high power single-frequency laser output is obtained using reflective Bragg grating (RBG) and etalon. RBG is used as an output coupling mirror and a longitudinal mode selector, combining with etalon to further suppress multiple longitudinal modes, the optical cavity length is increased and high power output is achieved. By optimizing the tilt angle of etalon, the central wavelengths of etalon and RBG can be matched and the insertion loss in cavity can be reduced. Finally, at the physical cavity length of 148.7 mm, a high-power single-frequency laser output with an average power of 750 mW, a pulse energy of 75 μJ at a repetition rate of 10 kHz, and a pulse duration of 8.3 ns is obtained.