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部分端面抽运的板条激光器是一种新型固体激光器,配合混合腔可以实现在大功率下保持高光束质量的激光振荡输出。谐振腔的腔镜倾斜是影响激光器输出特性的重要因素,快速傅里叶方法是一种快捷有效的计算方法,利用此方法模拟了腔镜倾斜对近场相位分布和远场光强分布的影响,并分析了光束质量的变化。理论分析表明,腔镜的小角度倾斜对近场相位影响较大,但对远场光强空间分布影响不大;随着倾斜角度不断增大,远场发散角和光束腰宽度也增大,光束质量虽然存在恶化的趋势,但光束质量因子M2值仍然较小,离轴非稳腔仍能保持高光束质量的输出。
Partially end-pumped lath lasers are a new type of solid-state lasers that, combined with a mixing chamber, provide laser oscillation output that maintains high beam quality at high power. Resonator cavity mirror tilt is an important factor affecting the laser output characteristics, fast Fourier method is a fast and effective method of calculation, the use of this method to simulate the cavity mirror tilt of the near-field phase distribution and far-field light intensity distribution , And analyzed the change of beam quality. Theoretical analysis shows that the small angle tilt of the endoscope has a great influence on the near-field phase but has little effect on the spatial distribution of the far-field light intensity. As the tilt angle increases, the far-field divergence angle and beam waist width also increase, Although the beam quality tends to deteriorate, the beam quality factor M2 is still small, and the off-axis unstable cavity can still maintain a high beam quality output.