Mid-infrared supercontinuum generation in an all-solid hybrid microstructured optical fiber

Hoa Phuoc Trung Nguyen; Hoang Tuan Tong; Than Singh Saini; Xing Luo; Morio Matsumoto; Goichi Sakai; Takenobu Suzuki; Yasutake Ohishi

doi:10.1117/12.2545407

2 March 2020 Mid-infrared supercontinuum generation in an all-solid hybrid microstructured optical fiber

Hoa Phuoc Trung Nguyen, Hoang Tuan Tong, Than Singh Saini, Xing Luo, Morio Matsumoto, Goichi Sakai, Takenobu Suzuki, Yasutake Ohishi

Author Affiliations +

Proceedings Volume 11264, Nonlinear Frequency Generation and Conversion: Materials and Devices XIX; 112641T (2020) https://doi.org/10.1117/12.2545407
Event: SPIE LASE, 2020, San Francisco, California, United States

Abstract

Supercontinuum (SC) has been applied in many applications such as optical coherence tomography, high-precision spectroscopy and frequency metrology [1]. SC can be generated in highly nonlinear fibers by launching high intensity laser pulses into these fibers. The dynamics of SC generation (SCG) closely relates to the chromatic dispersion of the fibers [2]. In the normal dispersion regime, the spectrum broadening dynamics is mainly based on self phase modulation and optical wave breaking which are self-seeded processes. Thus, the output SC preserves its high coherence. Highly coherent and broadband mid-infrared SCG in the all-normal dispersion regime was demonstrated by pumping at 8, 10, and 12 μm [3]. However, only few laser sources are able to provide such long wavelengths. Moving the pumping laser wavelengths to around 1.5 or 2 μm will be more attractive because many commercial fiber lasers are available. In this report, we propose a novel tellurite fiber for supercontinuum generation with a pumping laser at 2 μm. The fiber is obtained by adding six solid rods around the core of a step-index fiber. Such fiber is called all-solid hybrid microstructured optical fiber (ASHMOF). The fiber possesses flattened chromatic dispersion from 2 to 4 μm. Successful fabrication of the ASHMOF was done with an in-house drawing tower. Using a laser pumping at 2 μm into the ASHMOF, highly coherent and high spectral flatness supercontinuum spanning a range from 1.4 to 3.0 μm at - 20 dB level was experimentally generated. Such broad and highly coherent SC will be valuable for applications as optical coherence tomography, ultrafast transient absorption spectroscopy, etc.

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Hoa Phuoc Trung Nguyen, Hoang Tuan Tong, Than Singh Saini, Xing Luo, Morio Matsumoto, Goichi Sakai, Takenobu Suzuki, and Yasutake Ohishi "Mid-infrared supercontinuum generation in an all-solid hybrid microstructured optical fiber", Proc. SPIE 11264, Nonlinear Frequency Generation and Conversion: Materials and Devices XIX, 112641T (2 March 2020); https://doi.org/10.1117/12.2545407

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KEYWORDS

Optical fibers

Dispersion

Supercontinuum generation

Glasses

Structured optical fibers

Fiber lasers

Mid-IR

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