Mid-infrared supercontinuum generation in chalcogenide multi-step index fibers with normal chromatic dispersion

K. Nagasaka; Hoang Tuan Tong; Lai Liu; Morio Matsumoto; Hiroshige Tezuka; Takenobu Suzuki; Yasutake Ohishi

doi:10.1117/12.2251984

16 February 2017 Mid-infrared supercontinuum generation in chalcogenide multi-step index fibers with normal chromatic dispersion

K. Nagasaka, Hoang Tuan Tong, Lai Liu, Morio Matsumoto, Hiroshige Tezuka, Takenobu Suzuki, Yasutake Ohishi

Author Affiliations +

Proceedings Volume 10100, Optical Components and Materials XIV; 1010021 (2017) https://doi.org/10.1117/12.2251984
Event: SPIE OPTO, 2017, San Francisco, California, United States

Abstract

We experimentally demonstrate mid-infrared supercontinuum (SC) generation in chalcogenide multi-step index fibers (MSIF) pumped by a femtosecond laser. The fabricated chalcogenide MSIF is composed of a high refractive index core (C1) in the center, which is enclosed by a lower refractive index core layer (C2) and an outer cladding. This fiber structure is advantageous to tailor the chromatic dispersion with higher freedom and to keep the effective mode area small at long wavelengths. The high refractive index core, low refractive index core, and the outer cladding materials are As₂Se₃, AsSe₂ and As₂S₅, respectively. When the diameter of C1 and C2 are 7.8 and 30 μm, respectively, the zerodispersion wavelength (ZDW) of the fiber is 12.5 μm. The chromatic dispersion profile is near-zero and flattened within the range of ±20 ps/km/nm in the wavelength range from 4 to 17 μm and a broad normal dispersion region is obtained in the wavelength range shorter than the ZDW. In practice, a 2.8 cm long fiber is pumped at 10 μm by using a femtosecond laser whose pulse width is ~200 fs. The SC generation extending from 2 to 14 μm is obtained. Most of its spectrum is in the normal dispersion region of the fiber. These results are promising for the highly coherent mid-infrared SC generation.

Citation Download Citation

K. Nagasaka, Hoang Tuan Tong, Lai Liu, Morio Matsumoto, Hiroshige Tezuka, Takenobu Suzuki, and Yasutake Ohishi "Mid-infrared supercontinuum generation in chalcogenide multi-step index fibers with normal chromatic dispersion", Proc. SPIE 10100, Optical Components and Materials XIV, 1010021 (16 February 2017); https://doi.org/10.1117/12.2251984

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