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Proceedings Paper

Acoustics of the RF pulsed excited CO2 laser discharge
Author(s): Dorota A. Wojaczek; Edward F. Plinski; Jerzy S. Witkowski; Pawel Fortuna; Daniel Karlikowski; Andrzej B. Dobrucki
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Paper Abstract

The paper presents studies on influence of the gas laser cavity shape on an acoustic wave created in the cavity. Results of investigations on an RF excited CO2 slab-waveguide laser are shown. As is demonstrated, rapid changes of a laser plasma pressure appear in the laser gas mixture as a consequence of the pulsed RF discharge in the laser. The pressure variations create an acoustic wave propagated in the laser chamber, and involve changes of the refractive index of an excited plasma. As a result, the frequency of the optical wave emitted by the laser changes - a "line hoppings" effect appears. In the case of the slab-waveguide laser an acoustic wave propagates in a closed space - the laser reservoir, that is a special kind of an acoustic resonator. As known, a material from which cavity is made, a shape of the walls and their mutual position are significant for a wave propagation. In the experiment, the walls of the chamber are made of aluminum, so it is a very reflecting area. More, the walls are parallel that is an advantageous condition for creating standing waves. The aluminum wedges were used in the experiment to change the geometry of the reservoir. The influence of pulse duration time on the acoustic signal is investigated.

Paper Details

Date Published: 29 September 2005
PDF: 6 pages
Proc. SPIE 5953, Acousto-optics and Photoacoustics, 59530R (29 September 2005); doi: 10.1117/12.621825
Show Author Affiliations
Dorota A. Wojaczek, Wroclaw Univ. of Technology (Poland)
Edward F. Plinski, Wroclaw Univ. of Technology (Poland)
Jerzy S. Witkowski, Wroclaw Univ. of Technology (Poland)
Pawel Fortuna, Wroclaw Univ. of Technology (Poland)
Daniel Karlikowski, Wroclaw Univ. of Technology (Poland)
Andrzej B. Dobrucki, Wroclaw Univ. of Technology (Poland)

Published in SPIE Proceedings Vol. 5953:
Acousto-optics and Photoacoustics
Antoni Sliwinski; Rainer Reibold; Vitaly B. Voloshinov, Editor(s)

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