中国激光, 2014, 41 (8): 0802009, 网络出版: 2014-06-13
高稳定高性能皮秒光参量放大器抽运源研究
Research of High Stability High Performance Picosecond Pump Laser for Optical Parametric Amplification
激光器 光参量放大 再生放大器 短脉冲放大 增益窄化 lasers optical parametric amplification regenerative amplifier short pulse amplification gain narrowing
摘要
结合短脉冲光参量放大抽运源的需求,基于固体放大技术,对光纤锁模激光器输出的6 nm带宽皮秒纳焦耳级激光脉冲进行放大,获得了6.2 mJ的基频以及3.0 mJ的倍频输出,输出脉冲的时间宽度为8.6 ps,倍频光峰值功率密度为4.94 GW/cm2。采用高增益的Nd3+YLF再生放大器做前级放大器,利用其光谱增益窄化效应获得窄带的高功率光参量放大抽运光。理论计算表明,在此增益条件下,输出激光的光谱将被窄化至0.3 nm。采取了合理的空间整形方案,输出激光的近场呈平顶分布,光束质量优良。再生放大器采用钢棒结构,降低温度变化对系统稳定性的影响,总能量输出稳定性优于1%(RMS)。
Abstract
A picosecond pump laser is demonstrated for short pulse optical parametric amplification. An all fiber mode-lock laser pulse with 6 nm bandwidth, 12.4 ps duration and nJ energy is amplified by a solid state amplifier. Amplified laser pulses with 6.2 mJ single pulse energy, 8.6 ps pulse width, 1053 nm wavelength are obtained. After frequency doubling, laser pulses with 3.0 mJ energy and 4.94 GW/cm2 intensity are achieved. A high gain Nd3+YLF regenerative amplifier is used as the first stage amplifier to generate narrow-band high power laser by taking advantage of the gain narrowing effect, and a bandwidth of 0.3 nm is obtained in theory. The output laser beam shows a top flat profile with excellent beam shaping. 1% (RMS) fluctuation is achieved by the stable regenerative amplifier which employs a three-steel-rod structure to mount the cavity.
彭宇杰, 潘雪, 王江峰, 范薇, 李学春. 高稳定高性能皮秒光参量放大器抽运源研究[J]. 中国激光, 2014, 41(8): 0802009. Peng Yujie, Pan Xue, Wang Jiangfeng, Fan Wei, Li Xuechun. Research of High Stability High Performance Picosecond Pump Laser for Optical Parametric Amplification[J]. Chinese Journal of Lasers, 2014, 41(8): 0802009.