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从LD端面抽运固体激光器的激光阈值公式出发,建立了双波长激光同时振荡的阈值条件,理论计算了腔镜对于两个波长的透过率关系,实现了LD端面抽运Nd:YAG1319nm/1338nm双波长激光连续和准连续输出.双波长激光连续输出功率可达6W,斜效率为30%;准连续输出功率在重复频率50kHz时可达4.75W,斜效率为24.73%,脉冲宽度为55.05ns;腔内插入布儒斯特片,在重复频率为50kHz时,双波长激光准连续线偏振输出功率可达2.22W,不稳定性小于0.52%,M2因子仅为1.16.这两条非常接近的谱线为进一步通过非线性光学差频方法获得高相干性太赫兹波提供了实验基础.
Starting from the laser threshold formula of LD laser pumping, a threshold condition of simultaneous oscillation of dual-wavelength laser was established. The relationship between the transmittance of the two mirrors and the end-pumped Nd: YAG 1319nm / 1338nm The dual-wavelength laser can output continuously and quasi-continuously.The output power of dual-wavelength laser can reach 6W, the slope efficiency is 30%, the quasi-continuous output power is 4.75W at the repetition frequency of 50kHz, the slope efficiency is 24.73% and the pulse width is 55.05ns ; The intracavity insertion of Brewster’s patch at a repetition rate of 50 kHz yields a quasi-continuous-wave linearly polarized dual-wavelength laser with an output power of up to 2.22 W, an instability of less than 0.52% and a M2 factor of only 1.16. These two closely related The spectral line provides the experimental basis for further obtaining the highly coherent terahertz wave by the method of nonlinear optical differencing.