Impact of Mode Filtering on the Performance of Femtosecond Pulse Amplification in a Large Mode Area Fiber

Junichi HAMAZAKI  Housei MOGI  Norihiko SEKINE  Satoshi ASHIHARA  Akifumi KASAMATSU  Iwao HOSAKO  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E98-C   No.9   pp.928-933
Publication Date: 2015/09/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E98.C.928
Type of Manuscript: PAPER
Category: Optoelectronics
Keyword: 
fiber amplifier,  ultra-short pulse,  Yb-doped fiber,  double-clad fiber,  mode filtering,  

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Summary: 
We experimentally investigated the impact of the mode filtering technique on the performances of pulse amplification in a fiber with a large core diameter. The technique was applied to a femtosecond pulse amplifier, and was based on a large area double-clad Yb-doped fiber. The mode filtering enabled selective excitation of the lowest transverse mode with minimal contamination of higher order modes. The output pulses with 110 fs duration, > 30 nJ pulse energy (> 3 W average power), and clean spatial/temporal profiles were successfully generated. Benefits of this technique are also discussed.