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In-situ Tapering of Chalcogenide Fiber for Mid-infrared Supercontinuum Generation

Rudy, Charles W. and Marandi, Alireza and Vodopyanov, Konstantin L. and Byer, Robert L. (2013) In-situ Tapering of Chalcogenide Fiber for Mid-infrared Supercontinuum Generation. Journal of Visualized Experiments, 75 . Art. No. e50518. ISSN 1940-087X. doi:10.3791/50518.

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Supercontinuum generation (SCG) in a tapered chalcogenide fiber is desirable for broadening mid-infrared (or mid-IR, roughly the 2-20 μm wavelength range) frequency combs for applications such as molecular fingerprinting, trace gas detection, laser-driven particle acceleration, and x-ray production via high harmonic generation. Achieving efficient SCG in a tapered optical fiber requires precise control of the group velocity dispersion (GVD) and the temporal properties of the optical pulses at the beginning of the fiber, which depend strongly on the geometry of the taper. Due to variations in the tapering setup and procedure for successive SCG experiments-such as fiber length, tapering environment temperature, or power coupled into the fiber, in-situ spectral monitoring of the SCG is necessary to optimize the output spectrum for a single experiment. In-situ fiber tapering for SCG consists of coupling the pump source through the fiber to be tapered to a spectral measurement device. The fiber is then tapered while the spectral measurement signal is observed in real-time. When the signal reaches its peak, the tapering is stopped. The in-situ tapering procedure allows for generation of a stable, octave-spanning, mid-IR frequency comb from the sub harmonic of a commercially available near-IR frequency comb. This method lowers cost due to the reduction in time and materials required to fabricate an optimal taper with a waist length of only 2 mm. The in-situ tapering technique can be extended to optimizing microstructured optical fiber (MOF) for SCG or tuning of the passband of MOFs, optimizing tapered fiber pairs for fused fiber couplers and wavelength division multiplexers (WDMs), or modifying dispersion compensation for compression or stretching of optical pulses.

Item Type:Article
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URLURL TypeDescription DOIArticle
Marandi, Alireza0000-0002-0470-0050
Byer, Robert L.0000-0003-1331-0318
Additional Information:© 2013 JoVE. The authors would like to thank G. Shambat, C. Phillips, K. Aghaei for invaluable discussions, F. Afshinmanesh for SEM images, T. Marvdashti for experimental support, and M.F. Churbanov and G.E. Snopatin from the Institute of Chemistry of High-Purity Substances and V.G. Plotnichenko and E.M. Dianov from the Fiber Optics Research Center of the Russian Academy of Sciences for providing the As_2S_3 fiber. We also are grateful for support from the Office of Naval Research, NASA, the Air Force Office of Scientific Research, Agilent, and the Joint Technologies Office. A United States provisional patent has been filed protecting the technology disclosed in this article.
Funding AgencyGrant Number
Office of Naval Research (ONR)UNSPECIFIED
Air Force Office of Scientific Research (AFOSR)UNSPECIFIED
Agilent TechnologiesUNSPECIFIED
Joint Technologies OfficeUNSPECIFIED
Record Number:CaltechAUTHORS:20180608-153750646
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Official Citation:Rudy, C. W., Marandi, A., Vodopyanov, K. L., Byer, R. L. In-situ Tapering of Chalcogenide Fiber for Mid-infrared Supercontinuum Generation. J. Vis. Exp. (75), e50518, doi:10.3791/50518 (2013).
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:86947
Deposited By: George Porter
Deposited On:08 Jun 2018 22:51
Last Modified:15 Nov 2021 20:43

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