Laser diode pumped Nd:YVO4 laser generating quasi-non-diffracting green beam by passive axicon
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摘要: 使用连续式输出的砷化镓半导体激光器泵浦的掺钕钒酸钇激光器作为光源，利用磷酸氧钛钾晶体腔内倍频产生波长为532 nm的绿光，通过轴棱锥产生了近似无衍射贝塞尔光束。推导了倍频产生的绿光的场分布，并模拟了倍频绿光经过轴棱锥产生的近似无衍射光束的轴向光强分布图和截面光强分布图。通过实验拍摄了距离轴棱锥不同位置的截面光强分布，测量了无衍射贝塞尔绿光的最大无衍射距离和中心光斑直径，实验数据与理论模拟基本吻合。实验结果说明所述方法产生的倍频无衍射绿光具有良好的光束质量，具有应用价值。Abstract: Laser diode pumped Nd:YVO4 laser is used as light source. Green beam whose wavelength is 532 nm is generated by frequency doubling through KTP. The quasi-non-diffracting Bessel green beam is obtained by axicon. The distribution of the green beam light field is deduced. The intensity distribution along the propagation distance and the cross-section intensity distribution of the quasi-non-diffracting Bessel green beam are simulated. In experiment, the cross-section light field distribution of Bessel green beam at different distance from axicon are recorded and the propagation distance of non-diffracting beam and the diameter of center light spot are measured. The experimental data agree well with the theoretical simulation. The experimental results demonstrate the quasi-non-diffracting Bessel green beam has good quality and is appropriate for applying.
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Key words:
- laser diode /
- Bessel beam /
- frequency doubling /
- axicon
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