【摘要】 实验研究了以钛宝石薄片作为增益介质的再生激光放大器,其钛宝石薄片厚度为2mm,前表面作为通光面,镀有对抽运激光和放大激光增透的高阈值双色介质膜,后表面作为反射面,镀有对抽运激光和放大激光高反的高阈值双色介质膜,晶体对抽运激光的吸收率大于80%(1次透射和1次反射)。在再生腔中,钛宝石晶体不仅作为增益介质,也作为反射腔镜,简化了放大腔腔型。钛宝石晶体采用端面冷却的方式,极大地降低了晶体中的热效应,从而提高了放大脉冲激光的光束质量,在此基础上获得了能量为5.2mJ的放大激光脉冲输出,能量转换效率达到11.5%,放大激光光束质量因子M2小于1.2。更多还原

【Abstract】 A regenerative amplifier taking a thin disk Ti:sapphire crystal(2 mm thick) as gain medium is presented.The front face of crystal is anti-reflection(AR) coated at 532 nm and 750~850 nm,the other face is high reflection(HR) coated at 532 nm and 750~850 nm,and the total absorbing efficiency of the crystal is over 80% at 532 nm for double passes.In the regenerative cavity,the Ti:sapphire crystal also acts as a flat reflective mirror,which reduces the complexity of amplifier.The crystal is end-cooled to reduce the thermal effects and improve the beam quality of amplified laser pulses,as a result,the output energy of the amplified laser is about 5.2 mJ,the corresponding conversion efficiency is 11.5%,and the beam quality factor M2 is less than 1.2.更多还原