Suppression of self-induced depolarization of laser radiation in Faraday isolators

Efim A. Khazanov

doi:10.1117/12.351056

23 June 1999 Suppression of self-induced depolarization of laser radiation in Faraday isolators

Efim A. Khazanov

Proceedings Volume 3609, Optical Pulse and Beam Propagation; (1999) https://doi.org/10.1117/12.351056
Event: Optoelectronics '99 - Integrated Optoelectronic Devices, 1999, San Jose, CA, United States

Abstract

A lot of laser applications require propagation of extremely high average power radiation through Faraday isolators. Although many investigations are devoted to the thermal lens effect, polarization contamination has not been discussed in detail. However, the depolarization can significantly limit the isolation ratio. The physical reason for the self- induced depolarization is absorption of laser radiation. It results in spatial nonuniform distribution of temperature giving rise to two effects which reduce the isolation ratio: the temperature dependence of Verdet constant and birefringence ratio is sum of two terms which represent these two effects and the last phenomena is more efficient. In order to suppress the self-induced depolarization tow novel optical schemes was suggested and realized in experiment. The idea of compensating depolarization is to replace one 45 degree Faraday rotator by two 22.5 degrees rotators and a reciprocal optical element between them. The polarization distortions which a beam undertakes while passing the first rotator will be partially compensated in the second rotator. Both schemes allow to increase isolation ratio up to 100 times in comparison to the traditional scheme. Different ways of design of Faraday isolator for 1kW average power with isolation ratio about 30 dB are discussed.

Citation Download Citation

Efim A. Khazanov "Suppression of self-induced depolarization of laser radiation in Faraday isolators", Proc. SPIE 3609, Optical Pulse and Beam Propagation, (23 June 1999); https://doi.org/10.1117/12.351056

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available