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<p>We present the results of optimizing numerically a small-size cylindrical multipass cell based on a modified Herriott optical scheme. The cell has a separate THz beam input/output system and a common reflective cylindrical element that forms a closed measuring volume. Using numerical modeling methods and the geometric optics approach, the geometry of the cylindrical multipass cell was optimized. It is shown that the use of a reflective element with a parabolic profile allows one to minimize beam deformations during multiple reflections of the beam. The optimized geometry of the input/output system of the radiation and a reflective element having an internal radius of 65 mm and a height of 40 mm ensures the possibility to vary the optical path length in the range from 0.78 m to 2.61 m.</p>

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Optimization of a Multiple-Pass Gas Cell with Variable Optical Pathlength for a Terahertz Absorption Spectrometer

  • 期刊论文

  • 发表日期：

    2026年7月22日

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  • G. K. Raspopin,
  • A. V. Borisov,
  • A. G. Pauliš,
  • G. E. Dunaevsky,
  • V. L. Vax,
  • Yu. V. Kistenev

摘要

We present the results of optimizing numerically a small-size cylindrical multipass cell based on a modified Herriott optical scheme. The cell has a separate THz beam input/output system and a common reflective cylindrical element that forms a closed measuring volume. Using numerical modeling methods and the geometric optics approach, the geometry of the cylindrical multipass cell was optimized. It is shown that the use of a reflective element with a parabolic profile allows one to minimize beam deformations during multiple reflections of the beam. The optimized geometry of the input/output system of the radiation and a reflective element having an internal radius of 65 mm and a height of 40 mm ensures the possibility to vary the optical path length in the range from 0.78 m to 2.61 m.