宽带钕玻璃激光的高效三次谐波转换
High efficiency third-harmonic generation of broadband Nd:glass laser
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摘要: 提出了一种新颖的宽频带钕玻璃激光三倍频技术组合激光工作模式（宽带激光与窄带激光混频）方案。数值模拟研究表明:利用窄线宽钕玻璃激光脉冲，可以缓解宽频带激光谐波转换过程中群速度失配对转换效率的影响，从而提高宽带钕玻璃激光的转换效率；并且该方案可以与目前使用成熟的双和频晶体方案结合，从而能支持目前钕玻璃激光装置能达到的最大带宽约5 nm的高效三倍频（理论上效率达约80%）。Abstract: The paper proposes and numerically demonstrates a simple and efficient broadband frequency-tripling scheme for Nd:glass laser system based on mixing narrowband and broadband laser pulses in the sum-frequency generation (SFG) process. The group-velocity mismatching effect in the of SFG process is substantially alleviated with the assist of a narrowband laser, which is the dominant obstacle to efficient broadband third-harmonic generation. Moreover, by adding a second tripler in the SFG process, the proposed scheme will support efficient frequency tripling over a bandwidth of 5 nm (theoretical efficiency more than 80%).
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