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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry van Driel
  • Vol. 28, Iss. 10 — Oct. 1, 2011
  • pp: 2486–2498

Supercontinuum generation from ~1.9 to 4.5 μm in ZBLAN fiber with high average power generation beyond 3.8 μm using a thulium-doped fiber amplifier

Ojas P. Kulkarni, Vinay V. Alexander, Malay Kumar, Michael J. Freeman, Mohammed N. Islam, Fred L. Terry, Jr., Manickam Neelakandan, and Allan Chan  »View Author Affiliations


JOSA B, Vol. 28, Issue 10, pp. 2486-2498 (2011)
http://dx.doi.org/10.1364/JOSAB.28.002486


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Abstract

A mid-IR supercontinuum (SC) fiber laser based on a thulium-doped fiber amplifier (TDFA) is demonstrated. A continuous spectrum extending from 1.9 to 4.5 μm is generated with 0.7 W time-average power in wave lengths beyond 3.8 μm . The laser outputs a total average power of up to 2.6 W from 8.5 m length of ZrF 4 BaF 2 LaF 3 AlF 3 NaF (ZBLAN) fiber, with an optical conversion efficiency of 9 % from the TDFA pump to the mid-IR SC. Optimal efficiency in generating wavelengths beyond 3.8 μm is achieved by reducing the losses in the TDFA stage and optimizing the ZBLAN fiber length. We demonstrate a novel (to our knowledge) approach of generating modulation instability-initiated SC starting from 1.55 μm by splitting the spectral shifting process into two steps. In the first step, amplified approximately nanosecond-long 1.55 μm laser diode pulses with 2.5 kW peak power generate a SC extending beyond 2.1 μm in 25 m length of standard single-mode fiber (SMF). The 2 μm wavelength components at the standard SMF output are amplified in a TDFA and coupled into ZBLAN fiber leading to mid-IR SC generation. Up to 270 nm SC long wavelength edge extension and 2.5 × higher optical conversion efficiency to wavelengths beyond 3.8 μm are achieved by switching an Er:Yb-based power amplifier stage with a TDFA. The laser also demonstrates scalability in the average output power with respect to the pulse repetition rate and the amplifier pump power. Numerical simulations are performed by solving the generalized nonlinear Schrödinger equation, which show the long wavelength edge of the SC to be limited by the loss in ZBLAN.

© 2011 Optical Society of America

OCIS Codes
(190.4370) Nonlinear optics : Nonlinear optics, fibers
(320.6629) Ultrafast optics : Supercontinuum generation

ToC Category:
Ultrafast Optics

History
Original Manuscript: June 7, 2011
Manuscript Accepted: August 1, 2011
Published: September 26, 2011

Citation
Ojas P. Kulkarni, Vinay V. Alexander, Malay Kumar, Michael J. Freeman, Mohammed N. Islam, Fred L. Terry, Jr., Manickam Neelakandan, and Allan Chan, "Supercontinuum generation from ~1.9 to 4.5 μmin ZBLAN fiber with high average power generation beyond 3.8 μm using a thulium-doped fiber amplifier," J. Opt. Soc. Am. B 28, 2486-2498 (2011)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-28-10-2486

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