Photonic crystal fibers for supercontinuum generation pumped by a gain-switched CW fiber laser

Casper Larsen, Danny Noordegraaf, Kim P. Hansen, Kent Erik Mattsson, Ole Bang

Research output: Contribution to journalConference articleResearchpeer-review

Abstract

Supercontinuum generation in photonics crystal fibers (PCFs) pumped by CW lasers yields high spectral power density and average power. However, such systems require very high pump power and long nonlinear fibers. By on/off modulating the pump diodes of the fiber laser, the relaxation oscillations of the laser can be exploited to enhance the broadening process. The physics behind the supercontinuum generation is investigated by sweeping the fiber length, the zero dispersion wavelength, and the fiber nonlinearity. We show that by applying gain-switching a high average output power of up to 30 W can be maintained and the spectral width can be improved by 90%. The zero dispersion wavelength should be close to but below the pump wavelength to achieve the most visible light. By increasing the nonlinearity the fiber length can be reduced from 100 m to 25 m and the efficiency of visible light generation is improved by more than 200%.
Original languageEnglish
JournalProceedings of SPIE, the International Society for Optical Engineering
Volume8240
Pages (from-to)82400L
ISSN0277-786X
DOIs
Publication statusPublished - 2012
EventSPIE Photonics West : Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications XI - San Francisco, CA, United States
Duration: 21 Jan 201226 Jan 2012

Conference

ConferenceSPIE Photonics West : Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications XI
CountryUnited States
CitySan Francisco, CA
Period21/01/201226/01/2012

Keywords

  • Supercontinuum generation
  • Photonic crystal fiber
  • Fiber laser
  • Gain-switching

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