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This paper presents the comparative analysis of a Z-shaped optical resonator having a four-mirror laser cavity, with numerical methods of both Gradient Index lens and Brewster plate. The responses of the stability region and beam spot size with the variation of the cavity components, such as length between mirrors, radius of curvature, refractive index, and folding angle, have been examined in comparative form for both Gradient Index (GRIN) lens and Brewster-based models. The total cavity length of 91 mm with a pulse repetition rate of 3.84349 GHz for Brewster plate-based, and total cavity length of 78 mm with a pulse repetition rate of 3.29442 MHz for Gradient Index lens-based is matched to cover a round-trip distance of 874,225,000 mm. It is found that the Gradient index lens is applicable for output beam magnification, and the Brewster plate is used for avoiding the astigmatism effect for the propagation of laser beams.

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Optimization of Z-Shaped Optical Resonators: Balancing Beam Stability and Magnification with GRIN Lens and Brewster Plate Using Numerical Methods

  • 会议论文

  • 发表日期：

    2025年

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  • Dinkisa Dechasa Geyisa,
  • Satyasis Mishra,
  • Demissie Jobir Gelmecha,
  • Bijay Paikaray

摘要

This paper presents the comparative analysis of a Z-shaped optical resonator having a four-mirror laser cavity, with numerical methods of both Gradient Index lens and Brewster plate. The responses of the stability region and beam spot size with the variation of the cavity components, such as length between mirrors, radius of curvature, refractive index, and folding angle, have been examined in comparative form for both Gradient Index (GRIN) lens and Brewster-based models. The total cavity length of 91 mm with a pulse repetition rate of 3.84349 GHz for Brewster plate-based, and total cavity length of 78 mm with a pulse repetition rate of 3.29442 MHz for Gradient Index lens-based is matched to cover a round-trip distance of 874,225,000 mm. It is found that the Gradient index lens is applicable for output beam magnification, and the Brewster plate is used for avoiding the astigmatism effect for the propagation of laser beams.