Low-loss IBS mirrors for Zeeman laser gyros

George Y. Kolodnyi; Valentina V. Azarova; Yu. D. Golyaev; A. Melnikov; M. Rasyov; N. Tikhmenev

doi:10.1117/12.360112

7 September 1999 Low-loss IBS mirrors for Zeeman laser gyros

George Y. Kolodnyi, Valentina V. Azarova, Yu. D. Golyaev, A. Melnikov, M. Rasyov, N. Tikhmenev

Proceedings Volume 3738, Advances in Optical Interference Coatings; (1999) https://doi.org/10.1117/12.360112
Event: Optical Systems Design and Production, 1999, Berlin, Germany

Abstract

Zeeman laser gyros have found wide application. Contrary to ordinary laser gyros operating at linear polarization of emission, Zeeman gyros require the use of mirrors having low losses in both polarizations at oblique incidence of laser emission and minimum phase anisotropy. High-reflection TiO₂ and SiO₂ mirrors at 632 nm for such gyros have been produced by ion-beam sputtering for the angle of beam incidence of 45 +/- 1 degree. The characteristics of the optical coatings have been measured by laser modulated photothermal radiometry, photothermal deflection technique, total integrated scattering measurements, the resonance method using the ring cavity, and the ellipsometrical method. The obtained results have allowed optimization of the coating deposition processes. For the 23...25-layer mirrors the following results have been obtained: (i)absorption - 30...70 ppm; (ii) total integrated scattering - 50...70 ppm; (iii) total loss - 250...300 ppm in circular polarization; (iv) phase anisotropy of p and s components of emission - 0.03...0.05 rad. The produced mirrors have allowed realization of compact Zeeman laser gyros with a lock-in about 100...200 Hz and an accuracy of angular velocity measurement at a level of 0.1 degree/h. The ways to reduce the ion-beam mirror losses are discussed.

Citation Download Citation

George Y. Kolodnyi, Valentina V. Azarova, Yu. D. Golyaev, A. Melnikov, M. Rasyov, and N. Tikhmenev "Low-loss IBS mirrors for Zeeman laser gyros", Proc. SPIE 3738, Advances in Optical Interference Coatings, (7 September 1999); https://doi.org/10.1117/12.360112

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