1.4kW all-fiber narrow-linewidth polarization-maintained fiber amplifier

Rumao Tao; Pengfei Ma; Xiaolin Wang; Pu Zhou; Zejin Liu

doi:10.1117/12.2070990

3 February 2015 1.4kW all-fiber narrow-linewidth polarization-maintained fiber amplifier

Rumao Tao, Pengfei Ma, Xiaolin Wang, Pu Zhou, Zejin Liu

Proceedings Volume 9255, XX International Symposium on High-Power Laser Systems and Applications 2014; 92550B (2015) https://doi.org/10.1117/12.2070990
Event: XX International Symposium on High Power Laser Systems and Applications, 2014, Chengdu, China

Abstract

We report on the high power amplification of narrow-linewidth polarization-maintained (PM) laser in all-fiber PM MOPA configuration, which can operate with linewidth around 2GHz at above 1kW power level. Pump-limited maximum narrow-linewidth output power is 1.4kW without SBS effect, and the linearly-polarization single-mode output power was limited to ~550W by mode instabilities (MI). The beam quality of the fiber amplifier (M² ) was measured under different power, which degrades gradually from ~1.4 to ~2.2 after the onset of MI. The polarization extinction rate is measured to be about 90% before the onset of MI and reduce dramatically after MI sets in. The experimental results are analyzed based on a novel semi-analytical model, which has taken the effects of gain saturation into account. The theoretical results agree well with the experimental results. Mitigating MI by coiling the gain fiber has been analyzed and demonstrated numerically. It shows that, by tight coiling of the gain fiber to a radius of 4cm, the MI threshold can increase to 2.5 times higher than that without coiling or loose coiling, which means that the amplifier have the potential to achieve MI-free 1.4kW output power.

Citation Download Citation

Rumao Tao, Pengfei Ma, Xiaolin Wang, Pu Zhou, and Zejin Liu "1.4kW all-fiber narrow-linewidth polarization-maintained fiber amplifier", Proc. SPIE 9255, XX International Symposium on High-Power Laser Systems and Applications 2014, 92550B (3 February 2015); https://doi.org/10.1117/12.2070990

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