Experimental study of mode instability in high power all-fiber amplifier under different pumping power distribution

Xuexue Luo; Rumao Tao; Xiaoming Xi; Chen Shi; Hanwei Zhang; Xiaolin Wang; Pu Zhou; Xiaojun Xu

doi:10.1117/12.2502701

5 November 2018 Experimental study of mode instability in high power all-fiber amplifier under different pumping power distribution

Xuexue Luo, Rumao Tao, Xiaoming Xi, Chen Shi, Hanwei Zhang, Xiaolin Wang, Pu Zhou, Xiaojun Xu

Author Affiliations +

Proceedings Volume 10811, High-Power Lasers and Applications IX; 1081109 (2018) https://doi.org/10.1117/12.2502701
Event: SPIE/COS Photonics Asia, 2018, Beijing, China

Abstract

Detailed experimental investigations are presented on suppressing mode instability and stimulated Raman scattering by varying the pumping power distribution in a large mode area all-fiber amplifier with fiber core diameter of 20μm using bi-directional configuration. Results reveal that compared to employing co-directional pumping scheme, the fiber amplifier employing counter-directional pumping scheme can enhance the MI threshold power from 1250W to 1447W. Optimizing the pumping power distribution can further strength the mitigation of mode instability, such as the ratio of 57% and 66%, the threshold power is 2176W (highest output power) and 2150W respectively. For the ratio of 49%, which means almost identical scale of co-pumped light and counter-pumped light, the threshold power is 1934W. On the other hand, raising the proportion of backward pumping power can also mitigate the stimulated Raman scattering. 66% of backward pumping power can acquire 2150W output power and 20dB signal-to-noise ratio of the Raman peak, which indicates that optimizing the pumping power ratio can suppress mode instability and stimulated Raman scattering simultaneously.

Citation Download Citation

Xuexue Luo, Rumao Tao, Xiaoming Xi, Chen Shi, Hanwei Zhang, Xiaolin Wang, Pu Zhou, and Xiaojun Xu "Experimental study of mode instability in high power all-fiber amplifier under different pumping power distribution", Proc. SPIE 10811, High-Power Lasers and Applications IX, 1081109 (5 November 2018); https://doi.org/10.1117/12.2502701

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