微变形镜内腔补偿激光模式畸变研究
Intracavity aberration compensation of laser mode using membrane deformable mirror
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摘要: 采用Fox-Li迭代方法，对畸变相差以Zernike多项式展开，计算了不同菲涅耳数的谐振腔在畸变发生时的低阶输出模式，分析了激光器谐振腔内畸变对激光输出模式的影响。对微变形镜的面形以Zernike多项式进行拟合，计算了中心电极的影响函数，并建立了微变形镜控制模型。实验上将微变形镜作为激光器的一个腔镜，验证了微变形镜对激光输出模式的补偿作用。结果表明，内腔微变形镜对激光输出模式具有校正作用，激光基本上可以达到基模输出。
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关键词:
- 微变形镜 /
- 畸变 /
- 谐振腔 /
- 激光模式 /
- Zernike多项式
Abstract: The influence of resonator aberration upon the laser output mode is analyzed and simulated with Fox-Li method. The aberration is expanded by Zernike polynomials, and laser self-reproducing low-order modes upon aberrations with different Fresnel number has been calculated. The mirror surface is also fitted by Zernike polynomials and the influence function of the central actuator is calculated. At the same time the control model of the mirror is established. Compensation of laser output mode was validated by experiment using the deformable mirror as an end mirror of the laser resonator, an output with mostly TEM00 mode was got by the deformable mirror compensation.-
Key words:
- deformable mirror /
- aberration /
- resonator /
- laser mode /
- zernike polynomial
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