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A 5 kW CW CO2 laser using a novel negative-branch unstable resonator with a phase-unifying output coupler

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3 Author(s)
Y. Takenaka ; Mitsubishi Electric Corp., Hyogo, Japan ; M. Kuzumoto ; K. Yasui

A 5 kW CW CO2 laser using a negative-branch unstable resonator (M=-1.5) is proposed and characterized experimentally. The resonator consists of a stepwise variable reflecting output coupler, called the phase-unifying output coupler, and a total reflector. A 5 kW CW laser beam with diffraction limited quality (2θ=0.45 mrad) is obtained and affected by the focal point in the resonator. The misalignment angle to reduce the laser power to 95% is improved by a factor of 19 compared with a positive-branch unstable resonator (M=1.5) with a phase-unifying output coupler at the same resonator length

Published in:

IEEE Journal of Quantum Electronics  (Volume:28 ,  Issue: 9 )