The Effect Of Smoothing Of Thermooptical Inhomogeneities (STOI effect) In The Optically Dense Active Media Of The Solid-State Lasers

A. A. Danilov; I. A. Scherbakov

doi:10.1117/12.950084

24 March 1989 The Effect Of Smoothing Of Thermooptical Inhomogeneities (STOI effect) In The Optically Dense Active Media Of The Solid-State Lasers

A. A. Danilov, I. A. Scherbakov

Author Affiliations +

Proceedings Volume 1021, High Power Solid State Lasers; (1989) https://doi.org/10.1117/12.950084
Event: 1988 International Congress on Optical Science and Engineering, 1988, Hamburg, Germany

Abstract

A physical nature of smoothing of the thermooptical inhomogeneities (STOI effect) in the active media of solid-state lasers, while increasing absorption of the optical pumping, lies in the suppression of heat-conducting gradients by inhomogeneous pumping energy release. This leads to reduction of thermooptical stresses, provides inhomogeneity for refractive index of the active medium, and decreases laser radiation divergence, thus, making it possible to enhance the average power of generation /1-3/. This effect is more distinct if the optical excitation conditions of the active medium correspond to quasi-grey excita-tion and absorption spectra (optical density should be significantly more than unit), i.e. in the optically dense active media /4/. Later we shall regard the main occurence of the STOI effect in the solid-state lasers with optically dense active media, and present the results of experiments in chromium and neodymium co-doped rare-earth scandium garnets (RESG). In the pulsed solid-state lasers, these media (say, yttrium-scandium-gallium garnet with chromium and neodymium - YSGG:Cr3+, Nd3+ ) agree well with optically dense active medium, especially at high chromium concentration. Moreover, in these lasers the optical density can be varied widely due to a variation of chromium ion concentration, not changing the physics of the active medium from the point of view of spectrally-luminescent characteristics /5/.

Citation Download Citation

A. A. Danilov and I. A. Scherbakov "The Effect Of Smoothing Of Thermooptical Inhomogeneities (STOI effect) In The Optically Dense Active Media Of The Solid-State Lasers", Proc. SPIE 1021, High Power Solid State Lasers, (24 March 1989); https://doi.org/10.1117/12.950084

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