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Proceedings Paper

Mid-infrared supercontinuum generation up to 4.6 µm using step-index indium fluoride fiber pumped by a femtosecond fiber laser near 2 µm
Author(s): Reza Salem; Zack Jiang; Dongfeng Liu; Robert Pafchek; Paul Foy; Mohammed Saad; Doug Jenkins; Alex Cable; Peter Fendel
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Paper Abstract

We report mid-infrared supercontinuum (SC) generation in a dispersion-engineered step-index indium fluoride fiber pumped by a femtosecond fiber laser near 2 μm. The SC spans 1.8 octaves from 1.25 μm to 4.6 μm with an average output power of 270 mW. The pump source is an all-fiber femtosecond laser that generates sub-100 fs pulses at 50 MHz repetition rate with 570 mW average power. The indium fluoride fiber used for SC generation is designed to have a zerodispersion wavelength close to 1.9 μm. Two fiber lengths of 30 cm and 55 cm are selected for the SC generation experiments based on the numerical modelling results. The measured spectra and the numerical modelling results are presented showing good agreement for both lengths. The femtosecond pumping regime is a key requirement for generating a coherent SC. We show by modelling that the SC is coherent for a pump with the same pulse width and energy as our fiber laser and added quantum-limited noise. The results are promising for the realization of coherent and high-repetition-rate SC sources, two conditions that are critical for spectroscopy applications using FTIR spectrometers. Additionally, the entire SC system is built using optical fibers with similar core diameters, which enables integration into a compact platform.

Paper Details

Date Published: 9 March 2016
PDF: 7 pages
Proc. SPIE 9728, Fiber Lasers XIII: Technology, Systems, and Applications, 97280L (9 March 2016); doi: 10.1117/12.2213140
Show Author Affiliations
Reza Salem, Thorlabs, Inc. (United States)
Zack Jiang, Thorlabs, Inc. (United States)
Dongfeng Liu, Thorlabs, Inc. (United States)
Robert Pafchek, Thorlabs, Inc. (United States)
Paul Foy, Thorlabs, Inc. (United States)
Mohammed Saad, Thorlabs Inc. (United States)
Doug Jenkins, Thorlabs Inc. (United States)
Alex Cable, Thorlabs Inc. (United States)
Peter Fendel, Thorlabs Inc. (United States)

Published in SPIE Proceedings Vol. 9728:
Fiber Lasers XIII: Technology, Systems, and Applications
John Ballato, Editor(s)

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