Narrow line width operation of a 980 nm gain guided tapered diode laser bar

Deepak Vijayakumar, Ole Bjarlin Jensen, Jessica Barrientos-Barria, David Paboeuf, Gaëlle Lucas-Leclin, Birgitte Thestrup, Paul Michael Petersen

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Abstract

We demonstrate two different schemes for the spectral narrowing of a 12 emitter 980 nm gain guided tapered diode laser bar. In the first scheme, a reflective grating has been used in a Littman Metcalf configuration and the wavelength of the laser emission could be narrowed down from more than 5.5 nm in the free running mode to 0.04 nm (FWHM) at an operating current of 30 A with an output power of 8 W. The spectrum was found to be tunable within a range of 16 nm. In the second scheme, a volume Bragg grating has been used to narrow the wavelength of the laser bar from over 5 nm to less than 0.2 nm with an output of 5 W at 20 A. To our knowledge, this is the first time spectral narrowing has been performed on a gain guided tapered diode laser bar. In the Littman Metcalf configuration, the spectral brightness has been increased by 86 times and in the volume Bragg grating cavity the spectral brightness has been improved over 18 times when compared to the free running operation. These schemes could be also extended for other wavelengths of interest in the future.
Original languageEnglish
Pages (from-to)1131-1137
Number of pages7
JournalOptics Express
Volume19
Issue number2
DOIs
Publication statusPublished - 17 Jan 2011

Keywords

  • spectral narrowing
  • diode laser
  • Bragg grating

Cite this

Vijayakumar, D., Jensen, O. B., Barrientos-Barria, J., Paboeuf, D., Lucas-Leclin, G., Thestrup, B., & Petersen, P. M. (2011). Narrow line width operation of a 980 nm gain guided tapered diode laser bar. Optics Express, 19(2), 1131-1137. https://doi.org/10.1364/OE.19.001131