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4 April 1997 Influence of shock waves in the discharge region of a TEA CO2 laser
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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.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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);


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