Adaptive compensation of thermal lens in Faraday isolators

Efim A. Khazanov; Anatoly Poteomkin; Victor Zelenogorsky; Andrey Shaykin; Anantoly Mal'shakov; Oleg Palashov; David H. Reitze

doi:10.1117/12.528251

8 July 2004 Adaptive compensation of thermal lens in Faraday isolators

Efim A. Khazanov, Anatoly Poteomkin, Victor Zelenogorsky, Andrey Shaykin, Anantoly Mal'shakov, Oleg Palashov, David H. Reitze

Author Affiliations +

Proceedings Volume 5332, Solid State Lasers XIII: Technology and Devices; (2004) https://doi.org/10.1117/12.528251
Event: Lasers and Applications in Science and Engineering, 2004, San Jose, Ca, United States

Abstract

Two methods of compensation of thermal lensing in high wer terbium gallium garnet (TGG) Faraday isolators have been investigated in detail: compensation by means of an ordinary negative lens and compensation using FK51 Schott glass possessing a negative dn/dT. Key thermo-optic constants for TGG crystals and FK51 glass were measured. We find that the contribution of the photo-elastic effect to the total thermal lens cannot be neglected either for TGG or for FK51. We define a figure of merit for compensating glass and show that for FK51, an ordinary negative lens with an optimal focus is more efficient, but requires physical repositioning of the lens for different laser powers. In contrast, the use of FK51 as a compensating element is passive and works at any laser power, but is less effective than simple telescopic compensation. The efficiency of adaptive compensation can be considerably enhanced by using a compensating glass with figure of merit more than 50, a crystal with natural birefringence or gel.

Citation Download Citation

Efim A. Khazanov, Anatoly Poteomkin, Victor Zelenogorsky, Andrey Shaykin, Anantoly Mal'shakov, Oleg Palashov, and David H. Reitze "Adaptive compensation of thermal lens in Faraday isolators", Proc. SPIE 5332, Solid State Lasers XIII: Technology and Devices, (8 July 2004); https://doi.org/10.1117/12.528251

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