PPMgLN光参量振荡器温度和畴周期调谐研究

Study on temperature and domain period tuning of PPMgLN optical parametric oscillator

为了掌握周期性畴极化反转掺MgO铌酸锂(PPMgLN)光参量振荡器(OPO)的调谐特性,对掺摩尔分数5%MgO的铌酸锂晶体在不同温度下的Sellmeier方程进行系统研究.利用所得到的Sellmeier方程,通过数值计算得到了25℃下的畴周期调谐曲线以及不同畴周期下的温度调谐曲线.结果表明在波长为1.064μm的泵浦光作用下,畴周期为27.8~32.6μm时,可实现信号光波长在1.4~2.1μm,闲散光波长在2.1~4.5μm范围内的调谐.当畴周期从30.2μm到30.8μm每改变0.2μm时,将温度从20℃升高到100℃可弥补畴周期调谐中输出波长的不连续,实现信号光波长从1.51μm^1.58μm的连续可调.把温度调谐和畴周期调谐结合起来,可实现在较宽波长范围内对输出信号光的连续调谐.

To fully command the tuning characteristics of periodically poled MgO doped lithium niobate （PPMgLN）-based optical parametric oscillator （OPO）, the Sellmeier equation with mole fraction of 5% MgO doped lithium niobate at different temperature was studied. Both domain-period-dependent tuning curves at 25 ℃ and temperature-dependent tuning curves with different domain periods were obtained by numerical calculation. The results show that the signal wavelength of 1.4-2.1μm and idler wavelength of 2.1 -4.5 μm can be achieved with domain period varying from 27.8 μm to 32.6μm when pumped at 1. 064μm. When the domain period changed from 30.2 μm to 30.8μm with increment of 0.2μm at each step, the signal output can be continuously tuned 1.51- 1.58μm by elevating temperature 20-100℃. The combination of domain-period-dependent tuning with temperature-dependent tuning can enable the OPO to have a smooth tuning over a wide spectral range.