Numerical simulation of a Q-switched supersonic-flow chemical oxygen-iodine laser solving a time-dependent paraxial wave equation

Masataro Suzuki; Hiroshi Matsueda; Wataru Masuda

doi:10.1117/12.515639

10 November 2003 Numerical simulation of a Q-switched supersonic-flow chemical oxygen-iodine laser solving a time-dependent paraxial wave equation

Masataro Suzuki, Hiroshi Matsueda, Wataru Masuda

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Proceedings Volume 5120, XIV International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers; (2003) https://doi.org/10.1117/12.515639
Event: XIV International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, 2002, Wroclow, Poland

Abstract

Quality and power of the extracted beam from a Q-switched supersonic-flow chemical oxygen-iodine laser has been investigated by numerical simulation. The flow system adopted in this study is a throat mixing system proposed in the previous paper. The calculation code consists of two parts: one is a code for the gas flow and chemical reactions, and the other is that for the optics. Because of the difference of characteristic times between the phenomena in these two parts, every 300-time-steps of the latter calculation is coupled with one-time-step of the former. Both geometric and wave optics are calculated in order to assess the effects of diffraction. The wave optics is calculated with a paraxial wave equation derived in this study. The results indicate that the time dependence of the beam power is qualitatively similar between the wave and geometric optics. The peak power reaches to the maximum value at 90 ns after the initiation of oscillation. The peak value for the wave optics is 9% less than that for the geometric optics. The calculated spreading angle of the beam shows that the laser quality at the maximum power is slightly worse compared to that of continuous extraction.

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Masataro Suzuki, Hiroshi Matsueda, and Wataru Masuda "Numerical simulation of a Q-switched supersonic-flow chemical oxygen-iodine laser solving a time-dependent paraxial wave equation", Proc. SPIE 5120, XIV International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, (10 November 2003); https://doi.org/10.1117/12.515639

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KEYWORDS

Geometrical optics

Chemical lasers

Q switched lasers

Diffraction

Numerical simulations

Chemical reactions

Mirrors

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