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

作　　者：彭宇杰 潘雪[1] 王江峰[1] 范薇[1] 李学春[1] 

机构地区：[1]中国科学院上海光学精密机械研究所高功率激光物理联合实验室,上海201800 [2]中国科学院大学,北京100049

出　　处：《中国激光》2014年第8期45-50,共6页Chinese Journal of Lasers

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6nm带宽皮秒纳焦耳级激光脉冲进行放大,获得了6.2mJ的基频以及3.0mJ的倍频输出,输出脉冲的时间宽度为8.6ps,倍频光峰值功率密度为4.94GW/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0.3nm。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)。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 Nd^3＋ .＇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.

关 键 词：激光器 光参量放大 再生放大器 短脉冲放大 增益窄化 

分 类 号：TN248[电子电信—物理电子学]