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从傅里叶展开三波耦合波方程出发,对准相位匹配光学参量振荡进行了初步的理论分析,同时对准相位匹配周期极化掺镁铌酸锂微结构光学参量振荡进行了实验研究。通过改变微结构周期,实现了信号光从1.45～1.72μm的输出,最小阈值为30μJ。在温度30℃,抽运功率为300 mW,最大信号光输出功率为56 mW,斜率效率达18.7%。由于掺镁铌酸锂微结构抗光损伤性能显著提高,无需在高温下进行运转,使得掺镁铌酸锂微结构光学参量振荡器在常温条件下实现连续运转成为可能。与同成份铌酸锂微结构参量振荡器相比,结构更加紧凑,易于实现小型化。
Starting from the Fourier wave equation developed by Fourier, the theoretical analysis of the phase-matched optical parametric oscillations is carried out. At the same time, the phase-matched periodic polarization doped magnesium niobate microstructure optical parametric oscillation is studied experimentally. By changing the microstructure period, the signal light output from 1.45 ~ 1.72μm, the minimum threshold of 30μJ. At a temperature of 30 ℃, the pumping power is 300 mW, the maximum signal light output is 56 mW, and the slope efficiency reaches 18.7%. As Mg-doped lithium niobate microstructures have significantly improved light damage resistance and do not need to operate at high temperature, it is possible to achieve continuous operation of MgO-doped LiNbO3 microstructured optical parametric oscillators under normal temperature conditions. Compared with the same composition of lithium niobate microstructure parametric oscillator, the structure is more compact, easy to achieve miniaturization.