基于体布拉格光栅选模的单纵模激光器

Single Frequency Mode Laser Controlled by Volume Bragg Gratings

采用体布拉格光栅(VBG)作为纵模选择元件,组合使用透射式和反射式体布拉格光栅构成窄带滤波器进行纵模的选择,在Nd:YLF激光器中得到了单纵模几率100%,单脉冲能量2mJ,波长1053nm的单纵模输出。实验结果表明,体布拉格光栅用作选模元件的同时,又用作输出耦合镜,简化了单纵模激光器的结构,提高了抗干扰能力,且具有大功率输出的潜力。

The volume Bragg grating （VBG） recorded in photo-thermo-refractive （PTR） glass is used as longitudinal mode selection element,and use the narrow filter which consists of transmitting and reflecting gratings to select longitudinal mode. We have obtained 1053 nm single frequency mode with 100% single longitudinal mode rate,2 mJ pulse energy in Nd：YLF laser. The experimental results show that the volume Bragg gratings work as both mode selector and output coupler,therefore simplify the structure of the cavity structure and improve the anti-interference ability. The laser also has the potential of high-power output.