3300nm新型超宽带中红外光参量放大器的数值研究

Numerical Study on a New Scheme of 3300nm Mid-infrared Ultra-broadband Optical Parametric Chirped-pulse Amplification

基于扇形周期极化晶体与空间色散技术,本文提出了一种新型超宽带光参量放大器结构。该结构突破了当前各种光参量放大器只能在带宽与增益之间进行平衡的"瓶颈"。以该结构为基础,结合多泵浦源技术,比较研究了不同晶体结构、不同泵浦条件下的3300nm中红外啁啾脉冲光参量放大器的增益带宽与光谱特性,数值计算结果表明,该新型中红外光参量啁啾脉冲放大器在双泵浦条件下的增益带宽达到了320nm且可进一步扩展。

Based on the full two-dimensional characteristics of the quasi phase matched fan-out periodically poled crystal and spatial dispersion technique, a new scheme for ultra-broadband optical parametric chirped-pulse amplification is proposed and investigated. Combination of multi-pumping source technology, the gain-bandwidth and spectral characteristics of 3300nm infra red chirped pulse optical parametric amplifier with different crystal structures and different pumping conditions has been comparatively investigated, and numerical calculation results show that, the -3 dB gain bandwidth of mid infrared optical parametric chirped pulse amplifier using a fan-out PPLN with two pump beams, exceeds 320 nm and can be further broadened. Key words： middle-infrared; ultra-broadband; fan-out periodically poled crystal; quasi-phase matching; optical parametric chirped pulse amplification;