【摘要】 介绍了宽频带的高功率钕玻璃激光进行频率变换的意义、存在的困难和目前高效宽带谐波转换技术的一些进展。在详细分析已有的多种谐波转换技术(如光谱角色散技术、啁啾匹配技术、晶体级联、折返点匹配等)的特点和局限性的基础上,提出一种新颖的宽频带钕玻璃激光三倍频转换方案——组合激光工作模式方案(宽频带激光与窄带激光进行混频)。对该方案的转换带宽进行了数值研究,讨论了其转换带宽提高的内在物理原因,并分析了该方案在高功率激光装置中的应用前景。更多还原

【Abstract】 We review and discuss the methods of efficient frequency convension of broadband Nd:glass laser and its significance and difficulties.Firstly,we present the existing methods such as angular spectral dispersion,chirp-adapted phase-matching,multicrystal quadrature,and retracing point phase-matching in detail.Also we discuss their properties and limitations.On this basis,we propose a simple and efficient broadband frequency tripling scheme by mixing a narrowband pulse and a broadband one in the sum-frequency process.We study the conversion bandwidth numerically and discuss the physical cause of its high conversion bandwidth.The application prospect of this scheme on high power laser device is discussed as well.更多还原