Resonant intracavity modulator for q-switching a CO2 laser in a new parameter regime

Johan H. Stiens; W. Ranson; C. De Tandt; Vladimir M. Kotov; Gustaaf Borghs; Peter F. Muys; Roger A. Vounckx

doi:10.1117/12.364223

20 September 1999 Resonant intracavity modulator for Q-switching a CO₂ laser in a new parameter regime

Johan H. Stiens, W. Ranson, C. De Tandt, Vladimir M. Kotov, Gustaaf Borghs, Peter F. Muys, Roger A. Vounckx

Proceedings Volume 3822, Computer-Controlled Microshaping; (1999) https://doi.org/10.1117/12.364223
Event: Industrial Lasers and Inspection (EUROPTO Series), 1999, Munich, Germany

Abstract

In this paper we report on the development program of an original intracavity Q-switch for CO₂ lasers, called Integrated Mirror Optical Switch (IMOS). The IMOS is based on the optical plasma resonance effect in a GaAs- semiconductor when the refractive index of a tens of nm's thin MBE grown n-GaAs (5-8X10¹⁸cm^-3) layer is modulated by electronically controlling the electron density in the thin n-GaAs layer. A heterostructure diode is conceived to keep the power dissipation low. 15 to 30% modulation depth can be achieved for a depletion voltage of 15 V at 1 W power dissipation. Switching frequencies of more than 1 MHz were measured. These driving characteristics are very promising to turn a CO₂ laser into an easily computer controlled and flexible-machining tool. In order to achieve this, the structure of the Q-switch needs to be adapted for intracavity usage. Q-switches operating in reflection and transmission are compared and discussed. Highly efficient coupling mechanisms are suggested. Special attention will be paid to the design of diffraction gratings.

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Johan H. Stiens, W. Ranson, C. De Tandt, Vladimir M. Kotov, Gustaaf Borghs, Peter F. Muys, and Roger A. Vounckx "Resonant intracavity modulator for Q-switching a CO₂ laser in a new parameter regime", Proc. SPIE 3822, Computer-Controlled Microshaping, (20 September 1999); https://doi.org/10.1117/12.364223

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KEYWORDS

Diffraction gratings

Q switching

Plasma

Carbon dioxide lasers

Diodes

Reflection

Modulators

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