Analytical time-dependent theory of thermally induced modal instabilities in high power fiber amplifiers

I-Ning Hu; Cheng Zhu; Chao Zhang; Alexander Thomas; Almantas Galvanauskas

doi:10.1117/12.2002732

22 March 2013 Analytical time-dependent theory of thermally induced modal instabilities in high power fiber amplifiers

I-Ning Hu, Cheng Zhu, Chao Zhang, Alexander Thomas, Almantas Galvanauskas

Proceedings Volume 8601, Fiber Lasers X: Technology, Systems, and Applications; 860109 (2013) https://doi.org/10.1117/12.2002732
Event: SPIE LASE, 2013, San Francisco, California, United States

Abstract

A time-dependent analytical model is rigorously derived which shows that the thermally induced modal instability in high power rare-earth doped fiber amplifiers is fundamentally a two-wave mixing between fundamental and higher-order modes through a thermally-induced grating imprinted by beating between these modes. We show that previously postulated movement of this grating to phase-match the coupling between the modes naturally occurs due to a finite thermal-response time of a fiber. This theory is consistent with experimental observations in that it accurately predicts the onset-like threshold and temporal instabilities in the kilohertz-frequency range.

Citation Download Citation

I-Ning Hu, Cheng Zhu, Chao Zhang, Alexander Thomas, and Almantas Galvanauskas "Analytical time-dependent theory of thermally induced modal instabilities in high power fiber amplifiers", Proc. SPIE 8601, Fiber Lasers X: Technology, Systems, and Applications, 860109 (22 March 2013); https://doi.org/10.1117/12.2002732

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