基于PPLN温度渐变控制的宽调谐中红外差频产生激光光源

提出了一种基于等周期PPLN晶体渐变式温度控制的宽带中红外差频产生(DFG)激光光源的设计新方案。理论研究结果显示，在固定抽运光波长条件下，闲频光/信号光的准相位匹配(QPM)波长接收带宽(BW)随着晶体两端温度梯度的增加而增加，但差频转换效率却随之下降。当抽运光波长固定为1.08 μm时，在均匀温度条件下中红外闲频光的QPM BW约为8 nm。固定晶体初始端的温度为30 ℃，当晶体两端的温度梯度分别设定为20 ℃、40 ℃和60 ℃时，闲频光的QPM BW可分别拓宽至35 nm、80 nm和136 nm。与此同时，QPM带内相对差频转换效率分别下降至0.2、0.095 和0.06。当晶体初始端的温度设定为90 ℃，仍保持晶体两端的温度梯度为60 ℃时，该宽带的闲频光QPM带向短波长方向平移，其波长覆盖范围为3.288~3.464 μm。

Abstract

A novel scheme for broadband mid-infrared (mid-IR) difference frequency generation (DFG) based on a temperature-gradient-controlled equal periodic PPLN is proposed. The theoretical results show that, under condition of the fixed pump wavelength, the acceptance bandwitdth (BW) of idler/signal quasi-phase matching (QPM) is increased with the temperature gradient across the crystal, whereas the conversion efficiency decreases. When the pump wavelength is 1.08 μm, the idler QPM BW is about 8 nm in the uniform temperature case. However, when the initial end temperature is 30 ℃, and the crystal temperature gradient increases to 20 ℃, 40 ℃ and 60 ℃, the idler QPM BWs are broadened to 35 nm, 80 nm and 136 nm, and the relative conversion efficiencies decrease to 0.2, 0.095 and 0.06. When the temperature at the initial crystal end and the temperature gradient are 90 ℃ and 60 ℃, respectively, the broadband idler QPM band moves to the shorter wavelengths and could cover the range of 3.288~3.464 μm.

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常建华, 黄秦, 顾久驭, 王亚炜, 尹杰. 基于PPLN温度渐变控制的宽调谐中红外差频产生激光光源[J]. 中国激光, 2013, 40(12): 1202008. Chang Jianhua, Huang Qin, Gu Jiuyu, Wang Yawei, Yin Jie. Widely Tunable Mid-Infrared Difference Frequency Generation in a Temperature-Gradient-Controlled PPLN[J]. Chinese Journal of Lasers, 2013, 40(12): 1202008.

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