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9 September 2019 2μm femtosecond fiber laser source and its application for mid-IR supercontinuum generation
Fangzhou Tan, Hong Yang, Kebin Shi
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Proceedings Volume 11122, Ultrafast Nonlinear Imaging and Spectroscopy VII; 1112211 (2019) https://doi.org/10.1117/12.2528344
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States
Abstract
A compact thulium-doped fiber chirped pulse amplifier (FCPA) is presented and used to pump a ZrF4-BaF2-LaF3-AlF3- NaF (ZBLAN) fiber for mid-infrared (MIR) supercontinuum generation. The FCPA is seeded by Raman soliton, which is generated by femtosecond erbium doped fiber laser and a piece of highly nonlinear fiber (HNLF) via soliton self frequency shift (SSFS) process. Additional with fiber stretcher and three stages thulium-doped fiber amplifier, the laser source delivers up to 10 W average power at repetition rate of 10 MHz with pulse width of 252 fs after grating compressor. Supercontinuum generation is realized by coupling the pulses into 10 m ZBLAN fiber with an aspheric lens. Since the laser source operates at anomalous dispersion regime of ZBLAN fiber, the spectral broadening is mainly dominanted by SSFS and stimulated Raman scattering (SRS) in this dispersion regime. Maximum output power of 800 mW corresponding to pulse energy of 80 nJ has been obtained with 5 dB spectrum ranging from 2 μm to 3.5 μm, which is limited by the low pump coupling efficiency of ~10% at this time. This fiber based supercontinuum source may have a wide variety of applications such as medical imaging, micro-spectroscopy and gas detection.
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Fangzhou Tan, Hong Yang, and Kebin Shi "2μm femtosecond fiber laser source and its application for mid-IR supercontinuum generation", Proc. SPIE 11122, Ultrafast Nonlinear Imaging and Spectroscopy VII, 1112211 (9 September 2019); https://doi.org/10.1117/12.2528344
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KEYWORDS
ZBLAN
Fiber amplifiers
Mid-IR
Fiber lasers
Supercontinuum generation
Amplifiers
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