Title :
Amplitude modulation and power control of a pulse-preionized transverse-flow transverse-discharge CO2 laser
Author :
Choudhary, P. ; Agarwal, M.S. ; Nath, Ashish K.
Author_Institution :
Centre for Adv. Technol., Indore, India
fDate :
5/1/1997 12:00:00 AM
Abstract :
This paper describes the results of an amplitude modulation experiment performed on a pulse-preionized transverse-flow transverse-discharge CO2 laser. The amplitude modulation of the laser power was achieved by pulsewidth modulation of the discharge current using a switched-mode power supply. The causes of growth of discharge instability observed during the experiment with long excitation pulses are explained. The power control of the laser using this technique has been studied and this method is compared with the conventional method where the discharge current level is varied to achieve the laser-power control
Keywords :
amplitude modulation; carbon compounds; gas lasers; laser beam welding; laser modes; laser stability; machine tools; optical modulation; power control; preionisation; CO2; amplitude modulation; amplitude modulation experiment; discharge current; discharge current level; discharge instability; er-power control; excitation pulses; laser power; power control; pulse-preionized transverse-flow transverse-discharge CO2 laser; pulsewidth modulation; switched-mode power supply; Amplitude modulation; Laser excitation; Optical control; Optical pulses; Power control; Power lasers; Pulse modulation; Pulsed power supplies; Space vector pulse width modulation; Switched-mode power supply;
Journal_Title :
Quantum Electronics, IEEE Journal of
