Influence of shock waves in the discharge region of a TEA CO2 laser

Masayoshi Hagiwara; Mitsutoshi Suzuki; Osamu Suto; Takeshi Takahashi; Shinichiroh Kosugi; Sho Hibino; Akira Suda; Hideo Tashiro

doi:10.1117/12.271568

4 April 1997 Influence of shock waves in the discharge region of a TEA CO₂ laser

Masayoshi Hagiwara, Mitsutoshi Suzuki, Osamu Suto, Takeshi Takahashi, Shinichiroh Kosugi, Sho Hibino, Akira Suda, Hideo Tashiro

Author Affiliations +

Proceedings Volume 2987, Gas and Chemical Lasers and Applications II; (1997) https://doi.org/10.1117/12.271568
Event: Photonics West '97, 1997, San Jose, CA, United States

Abstract

Transverse and longitudinal density disturbances in the discharge volume of a transversely excited atmospheric carbon-dioxide laser are measured using a laser schlieren method, and two-dimensional aerodynamic calculations qualitatively reproduce the temporal histories of the disturbances. Exponential decay of the transverse disturbance between the flattened electrodes lasts for several milliseconds. An efficient damping of the shock wave after discharge is confirmed using an acoustic attenuator based on the Helmholtz resonator design. Accumulated pressure disturbances in the volume due to successive laser shots induce a gradual decrease to the steady-state energy level in a pulse-periodic operation, and it is deduced that the modulational instability in the shot to shot pulse energy results from the longitudinal standing wave.

Citation Download Citation

Masayoshi Hagiwara, Mitsutoshi Suzuki, Osamu Suto, Takeshi Takahashi, Shinichiroh Kosugi, Sho Hibino, Akira Suda, and Hideo Tashiro "Influence of shock waves in the discharge region of a TEA CO₂ laser", Proc. SPIE 2987, Gas and Chemical Lasers and Applications II, (4 April 1997); https://doi.org/10.1117/12.271568

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