Representation of the laser self-mixing effect in an acoustic signal

Downloads

Authors

  • Dorota Wojaczek Wrocław University of Technology, Institute of Telecommunications, Teleinformatics and Acoustics, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland
  • Edward Pliński Wrocław University of Technology, Institute of Telecommunications, Teleinformatics and Acoustics, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland
  • Andrzej Dobrucki Wrocław University of Technology, Institute of Telecommunications, Teleinformatics and Acoustics, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland

Abstract

The goal of the work is to check the possibility of observing the optical phenomena in the gas laser plasma using a microphone. An RF excited slab-waveguide carbon dioxide laser is used in the experiment. The investigations are performed on a three mirror resonator structure. An outside mirror is fixed to a vibration exciter to obtain a returnig wave to the laser resonator. In that way a self-mixing phenomenon is observed with the optical detector. The response of the laser plasma changes is detected as an acoustic signal. The results of the investigations can be useful for controlling the laser tuning.

Keywords:

CO$_2$ laser, laser plasma, acoustic wave, laser signature, self-mixing.