LDA侧泵Nd玻璃的高光束质量激光放大器研制  

Fabrication of a high-beam-quality square-shape laser pulse amplifier based on LDA side-pumping Nd glass

作　　者：邱基斯[1,2,3] 樊仲维[1,2] 唐熊忻[1,2,4] 林蔚然[1,2] 余锦[1,2] 

机构地区：[1]北京国科世纪激光技术有限公司,北京100092 [2]中国科学院光电研究院,北京100080 [3]长春光学精密机械与物理研究所,吉林长春130033 [4]中国科学院研究生院,北京100094

出　　处：《光电子．激光》2013年第1期28-33,共6页Journal of Optoelectronics·Laser

基　　金：北京市博士后科研基金(2012ZZ-60)资助项目

摘　　要：研制了一台高光束质量、高稳定的基于激光二极管阵列(LDA)侧泵Nd玻璃的纳秒方形激光脉冲放大器。为了获得较高的输出能量,采用LDA泵浦的"串联式双程放大"高增益组件进行能量放大。同时,为了获得高光束质量的光斑,利用液晶空间光调制器(LCSLM)对光束近场分布进行空间整形,以便得到超高斯平顶分布的光束,并对后级放大器增益不均性进行预补偿,最终得到了光束口径为Φ13mm、光束近场调制度小于1.22∶1的激光输出。放大器工作波长为1 053nm,当注入500nJ的3ns方形激光脉冲时,得到无脉冲畸变激光脉冲能量为100mJ、能量不稳定度为2.14%(均方根)和远场角漂移小于11μrad的高光束质量激光输出。A high beam-quality and high-stability laser amplifier based on LDA side-pumping Nd-glass applied to amplify a nanosecond laser pulse source has been developed in this paper. The main technique of the laser amplifier is the multilevel double-pass amplification and liquid crystal spatial light modulator （LCSLM） in near field control. The beam quality is one of the standards that measure the laser＇s quali ty;its high quality can improve the working flux and load capacity of the device, which plays a positive part in reducing the risk of damage for optical elements as well. The LCSLM is used in the amplifier for spatial beam shaping so as to improve the near-field uniformity,and compensating for real-time and adjustable laser beam by LCSLM can effectively control the near-field beam modulation. When the flat top pulse with the width of 3 ns and energy of 500 nJ is injected as the seed pulse,the average output energy of the laser amplifier is 100 mJ. The modulation degree of near field is less than 1.22 ： 1, the energy dis persion degree of the output laser is 2.14% ,and the beam angle drifting of the far-field is less than 11 μrad.

关 键 词：激光放大器 LD抽运 Nd玻璃 液晶空间光调制器(LCLSM) 高光束质量 

分 类 号：TN248.1[电子电信—物理电子学]