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Acoustic processes in RF excited CO2 laser plasma in pulse regime

Wojaczek D. A., Dobrucki A. B., Pliński E. F.

Optica Applicata

2010

Vol. 40, nr 1

143--153

Acoustic mapping of the back-scattering interferometer signal in a CO2 laser

Wojaczek D. A., Chodorowski P., Dobrucki A. B., Witkowski J. S., Pliński E. F.

Optica Applicata

2010

Vol. 40, nr 4

909--919

It is shown that a microphone placed in the laser plasma can be used for detection and observation of the optical phenomenon such as an optical feedback in a continuous wave regime of the laser operation. To observe the effect, a periodically moved external mirror has been used. The periodical changes of the optical beam intensity in the laser cavity generated changes in frequency and amplitude of the acoustic signal. In conclusion, the acoustic wave gives information about optical effects created in a waveguide CO2 laser.

Thermodynamic and optical parameters of the RF pulse excited slab-waveguide CO2 laser

Wojaczek D. A., Pliński E. F., Witkowski J. S.

Optica Applicata

2005

Vol. 35, nr 2

215-224

In the paper, changes of the optical and thermodynamic parameters, such as a refractive index, pressure, and temperature are investigated on an RF pulsed C02 slab-waveguide laser. Changes of the refractive index, and pressure are measured with a Mach-Zehnder interferometer, and microphone, respectively. A Gladstone-Dale formula is applied to calculate the changes of the temperature. It is shown how an acoustic wave in the laser cavity modifies the pressure of the laser medium in the course of the pulse duration. The results of measurements allow explaining a line hopping effect observed during the laser plasma pulse evolution.