A 5 kW CW CO/sub 2/ laser using a novel negative-branch unstable resonator with a phase-unifying output coupler

A 5 kW CW CO/sub 2/ 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...

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Bibliographic Details
Published inIEEE journal of quantum electronics Vol. 28; no. 9; pp. 1855 - 1858
Main Authors Takenaka, Y., Kuzumoto, M., Yasui, K.
Format Journal Article
LanguageEnglish
Published IEEE 01.09.1992
Subjects
Apertures
Coatings
Gas lasers
Niobium
Optical coupling
Phase measurement
Power generation
Power lasers
Power measurement
Rotation measurement
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Summary:A 5 kW CW CO/sub 2/ 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 (2 theta =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.< >
ISSN:0018-9197
1558-1713
DOI:10.1109/3.144476