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Abstract
A novel technique to measure the resultant focal length of the thermal lens in an amplifier using collimated beam of the oscillator for copper vapour laser system demonstrated. The resultant focal length was estimated using ray tracing approach in a 40 W system (CVL-40). Effect of input electrical power and neon buffer gas pressure on the resultant focal length was studied. Role of equivalent thermal lens in master oscillator power amplifier (MOPA) configuration was evaluated. Compensation techniques for minimization of the thermal lensing effect for a MOPA chain were theoretically studied using ray tracing in an equivalent lensing model. Compensation of thermal lensing for an eight module MOPA chain with CVL-40 (38 mm bore, 1.8 m long, 40 W, 9 kHz) systems studied. An eight-module MOPA chain configuration with minimized thermal lensing based on optimized compensation techniques is proposed. Our study finds benefits for high power laser systems used in various industrial, research and development applications like micromachining, high speed photography, bio-medical applications and pumping dye lasers for spectroscopy.
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