Journal
INFRARED PHYSICS & TECHNOLOGY
Volume 127, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.infrared.2022.104455
Keywords
Kelly sidebands; Soliton pulse; Tm-doped fiber; Chirped pulse amplifier
Categories
Funding
- National Natural Science Foundation of China [62005144, 61775119, 62175128]
- Natural Science Foundation of Shandong Prov-ince [ZR2020QF096]
- Qilu Young Scholar Program of Shandong Uni-versity
- Taishan Scholar Foundation of Shandong Province [tsqn201812010]
- High-level Talent Cultivation Funds of State Key Laboratory of Crystal Materials of Shandong University
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We have successfully achieved the complete separation of Kelly sidebands and main soliton pulse in a fiber chirped pulse amplifier by introducing a spatial filter. The separated Kelly sidebands are demonstrated to exist as independent pulses in the time domain. The power of the Kelly sidebands is amplified in the amplifier, while the main soliton pulse is also amplified and its duration is significantly shortened.
We theoretically and experimentally realize the complete separation of Kelly sidebands and main soliton pulse by introducing a spatial filter inside a pair of grating in a 2-mu m fiber chirped pulse amplifier (CPA). The separated Kelly sidebands are experimentally demonstrated to be manifested itself as an independent pulse in the time domain. The average power of the Kelly sidebands is further amplified from 8 mW to -3.7 W in the amplifier. The extracted main soliton pulse is amplified from -80 mW to > 7 W with the shortest pulse duration of 346 fs after anomalous or normal dispersion stretching. With further shaping the soliton spectrum to suppress the spectral narrowing effect, the pulse duration is further shortened to -200 fs.
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