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High power and high focusing CWCO2 laser using an unstable resonator with a phase-unifying output coupler

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5 Author(s)
Y. Takenaka ; Mitsuibishi Electr. Corp., Hyogo, Japan ; M. Kuzumoto ; K. Yasui ; S. Yagi
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A high-power and high-focusing continuous-wave (CW) CO2 laser with a novel unstable resonator was developed. This resonator contains a step-wise variable reflecting output coupler named the phase-unifying output coupler and a total reflector. The laser was excited by a capacitive-barriered AC discharge called a silent discharge. A linearly polarized laser beam with a diffraction-limited divergence angle of 0.55 mrad was obtained. Very stable CW laser operation at an output power of 5 kW was achieved with a threshold discharge power of 10 kW and a slope efficiency of 18%

Published in:

IEEE Journal of Quantum Electronics  (Volume:27 ,  Issue: 11 )