High-power CO2 laser using a new negative-branch unstable resonator with a phase-unifying output coupler

Yushi Takenaka; Masaki Kuzumoto; Koji Yasui

doi:10.1117/12.58974

1 May 1992 High-power CO₂ laser using a new negative-branch unstable resonator with a phase-unifying output coupler

Yushi Takenaka, Masaki Kuzumoto, Koji Yasui

Proceedings Volume 1628, Intense Laser Beams; (1992) https://doi.org/10.1117/12.58974
Event: OE/LASE '92, 1992, Los Angeles, CA, United States

Abstract

A high power CO2 laser using a new negative-branch unstable resonator (M equals -1.5) is proposed and investigated both theoretically and experimentally. The resonator consists of a stepwise variable reflecting output coupler termed phase-unifying output coupler and a total reflector. A 5 kW CW laser beam with diffraction limited quality (2(theta) equals 0.45 mrad) is obtained, not 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 equals 1.5) with a phase-unifying output coupler at the same resonator length.

Citation Download Citation

Yushi Takenaka, Masaki Kuzumoto, and Koji Yasui "High-power CO₂ laser using a new negative-branch unstable resonator with a phase-unifying output coupler", Proc. SPIE 1628, Intense Laser Beams, (1 May 1992); https://doi.org/10.1117/12.58974

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