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利用两块Ⅰ类KDP倍频晶体级联的方式,研究了时间相位调制宽带激光的二倍频特性。实验获得了二倍频转换效率与入射基频光功率密度的关系,在基频光功率密度为1.6GW/cm2时,最大二倍频转换效率达70%,接近理论模拟的结果。实验结果表明,在高功率密度和低功率密度基频光条件下,倍频光光谱宽度约为入射基频光带宽的一半,与理论计算结果一致,倍频光光谱未发生光谱窄化效应。实验结果为实现高效宽带二倍频和惯性约束核聚变(ICF)中利用高强度宽带二倍频光打靶提供了重要依据。
The double frequency characteristics of time-phase modulated broadband laser were studied by cascading two class I KDP frequency-doubling crystals. The relationship between the second harmonic conversion efficiency and incident fundamental optical power density was obtained experimentally. The maximum second harmonic conversion efficiency reached 70% at a fundamental optical power density of 1.6GW / cm2, close to the result of theoretical simulation. The experimental results show that the spectral width of frequency doubling light is about half of the bandwidth of incident fundamental frequency under the conditions of high power density and low power density of fundamental frequency light. It is consistent with the theoretical calculation that there is no spectral narrowing effect in frequency doubling light spectrum. The experimental results provide an important basis for achieving high-efficiency wideband double-frequency and inertial confinement fusion (ICF) using high-intensity broadband double-frequency light target.