Modified off-axis unstable resonator for copper vapor laser

Mordechai Lando; D. Belker; A. Lerrer; Haim Lotem; A. Dikman; Gabriel Bialolanker; S. Lavi; Shimon Gabay

doi:10.1117/12.43630

1 May 1991 Modified off-axis unstable resonator for copper vapor laser

Mordechai Lando, D. Belker, A. Lerrer, Haim Lotem, A. Dikman, Gabriel Bialolanker, S. Lavi, Shimon Gabay

Proceedings Volume 1412, Gas and Metal Vapor Lasers and Applications; (1991) https://doi.org/10.1117/12.43630
Event: Optics, Electro-Optics, and Laser Applications in Science and Engineering, 1991, Los Angeles, CA, United States

Abstract

Pointing stability, beam divergence and beam generating mode have been studied in a copper vapor laser equipped with a modified off-axis unstable resonator. In the modified cavity design, the convex mirror is coupled via the edge of a flat scraper mirror, in contrast to the common resonator design where the edge of a convex mirror is used for feedback. As a result, the pointing stability improved, and day to day fluctuations were as small as 200(mu) rad. The beam divergence was about nine times the diffraction limit for the green laser line. The relatively high beam divergence, as well as spatial and temporal analysis of the beam generating mode, shows that a beam traversing the active medium only three times constitutes the useful laser radiation. Possible mechanisms causing the dominance of the triple-pass beam are discussed. An explanation for the impact of the beam generating process on the pointing stability and its improvement in the new cavity design is suggested.

Citation Download Citation

Mordechai Lando, D. Belker, A. Lerrer, Haim Lotem, A. Dikman, Gabriel Bialolanker, S. Lavi, and Shimon Gabay "Modified off-axis unstable resonator for copper vapor laser", Proc. SPIE 1412, Gas and Metal Vapor Lasers and Applications, (1 May 1991); https://doi.org/10.1117/12.43630

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