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      Nonlinearity-tailored fiber laser technology for low-noise, ultra-wideband tunable femtosecond light generation

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      Author(s)
      Liu, X.
      Laegsgaard, J.
      Iegorov, R.
      Svane, A. S.
      Ilday, F. Ö.
      Tu, H.
      Boppart, S. A.
      Turchinovich, D.
      Date
      2017
      Source Title
      Photonics Research
      Print ISSN
      2327-9125
      Publisher
      OSA - The Optical Society
      Volume
      5
      Issue
      6
      Pages
      750 - 761
      Language
      English
      Type
      Article
      Item Usage Stats
      200
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      263
      downloads
      Abstract
      The emission wavelength of a laser is physically predetermined by the gain medium used. Consequently, arbitrary wavelength generation is a fundamental challenge in the science of light. Present solutions include optical parametric generation, requiring complex optical setups and spectrally sliced supercontinuum, taking advantage of a simpler fiber technology: a fixed-wavelength pump laser pulse is converted into a spectrally very broadband output, from which the required resulting wavelength is then optically filtered. Unfortunately, this process is associated with an inherently poor noise figure, which often precludes many realistic applications of such supercontinuum sources. Here, we show that by adding only one passive optical element—a tapered photonic crystal fiber—to a fixed-wavelength femtosecond laser, one can in a very simple manner resonantly convert the laser emission wavelength into an ultra-wide and continuous range of desired wavelengths, with very low inherent noise, and without mechanical realignment of the laser. This is achieved by exploiting the double interplay of nonlinearity and chirp in the laser source and chirp and phase matching in the tapered fiber. As a first demonstration of this simple and inexpensive technology, we present a femtosecond fiber laser continuously tunable across the entire red–green–blue spectral range.
      Keywords
      Fiber lasers
      Fibers
      Noise figure
      Nonlinear optics
      Optical pumping
      Phase matching
      Photonic crystal fibers
      Ultra-wideband (UWB)
      Emission wavelength
      Femtosecond fiber lasers
      Fiber technology
      Laser technologies
      Optical parametric generation
      Realistic applications
      Supercontinuum sources
      Tapered photonic crystal fiber
      Pumping (laser)
      Permalink
      http://hdl.handle.net/11693/37021
      Published Version (Please cite this version)
      http://dx.doi.org/10.1364/PRJ.5.000750
      Collections
      • Department of Electrical and Electronics Engineering 3868
      • Department of Physics 2485
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