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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, Full Text: PDF(793.7KB)>>
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. | |||||
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