18mJ,100Hz飞秒钛宝石激光放大器  

A 18 mJ femtosecond Ti:sapphire amplifier at 100 Hz repetition rate

作　　者：张伟 滕浩[4] 沈忠伟[4] 何鹏[4] 王兆华[4] 魏志义[4] 

机构地区：[1]首都医科大学附属北京同仁医院,北京同仁眼科中心,北京市眼科研究所 [2]北京市眼科学与视觉科学重点实验室 [3]国家眼科诊断与治疗工程技术研究中心,北京100005 [4]中国科学院物理研究所,北京凝聚态物理国家实验室,北京100190

出　　处：《物理学报》2016年第22期241-247,共7页Acta Physica Sinica

基　　金：国家重大科学仪器设备开发专项基金(批准号:2012YQ120047);国家自然科学基金(批准号:11434016)资助的课题~~

摘　　要：采用环形腔再生放大及四通放大的两级放大方案,在重复频率100Hz、单脉冲能量75.1mJ的倍频Nd:YAG激光抽运下,通过啁啾脉冲放大飞秒钛宝石激光,获得了单脉冲能量25.4mJ的放大输出,对应能量转换效率33.8%.经光栅压缩器补偿色散后的单脉冲能量为18.3mJ,脉冲宽度为37.8 fs,对应峰值功率0.48 TW.测量其脉冲能量稳定性为3.6%,光束质量M^2因子在X和Y方向上分别为1.8,1.6.High energy and high repetition rate femtosecond Ti：sapphire lasers are widely used in isolated attosecond pulses and high-order harmonic generation. Enhancing the driving laser energy is a convenient and effective way to improve attosecond pulse energy. A 1 kHz or higher repetition rate millijoule level femtosecond Ti：sapphire amplifier is generally used to generate isolated attosecond. However, due to the limitation of its green pump laser energy, the energy of femtosecond Ti：sapphire laser is limited to several millijoules. Appropriately reducing the requirements for repetition rate, realizing high energy driving laser will significantly improve attosecond pulse energy and extend its application scope. Meanwhile, a 532 nm pump laser from frequency doubled 1064 nm Nd：YAG flash lamp pumped laser at 100 Hz repetition rate can achieve high pump energy with lower cost. Accordingly, we develope a 100 Hz repetition rate high energy amplifier based on Ti： sapphire crystal The femtosecond amplifier system consists of oscillator, stretcher, ring cavity regenerative amplifier, four-pass amplifier and grating compressor. The ring cavity regenerative amplifier is the first amplifier as pre-amplifier, and the four-pass amplifier is the booster amplified-stage. 80 MHz seed pulse from the oscillator has a full width at half maximum bandwidth of 61 nm with a 20 fs duration. Then the seed pulses are stretched to 200 ps with a Martinez grating stretcher, rotated to vertical polarization and injected into the regenerative amplifier. The amplified uncompressed 1 kHz repetition rate laser pulses with 3 mJ pulse energy are selected to be 100 Hz and input into the four-pass amplifier. With a pulse energy of 75.1 m J, wavelength at 532 nm flash lamp pumped pump laser at 100 Hz repetition rate, single pulse energy up to 25.4 mJ is obtained from a Ti： sapphire crystal, corresponding to a high energy conversion efficiency of 33.8%. We believe that higher energy should be possible if the pump energy can be further increased. A

关 键 词：啁啾脉冲放大 飞秒激光脉冲 再生放大 多通放大 

分 类 号：TN722[电子电信—电路与系统]