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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 18 — Aug. 29, 2011
  • pp: 16890–16897

Direct measurement of the spectral reflectance of OP-SDL gain elements under optical pumping

Carl Borgentun, Jörgen Bengtsson, and Anders Larsson  »View Author Affiliations


Optics Express, Vol. 19, Issue 18, pp. 16890-16897 (2011)
http://dx.doi.org/10.1364/OE.19.016890


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Abstract

We report on a direct measurement method for acquiring highly precise reflectance spectra of gain elements for semiconductor disk lasers under optical pumping. The gain element acts as an active mirror, and the active mirror reflectance (AMR) was measured with a weak and tunable probe beam coincident on the gain element with a high-power pump beam. In particular, we measured the spectral AMR of a gain element designed to have a broad and flat AMR spectrum by being anti-resonant at the center wavelength and employing a parametrically optimized anti-reflection structure. We were able to confirm that this sophisticated gain element performs according to design, with an almost constant AMR of ∼103% over a wavelength range of nearly 35 nm, very well matching the simulated behavior. Such gain characteristics are useful for optically pumped semiconductor disk lasers (OP-SDLs) designed for broadband tuning and short-pulse generation through mode-locking. The measurement technique was also applied to a conventional resonant periodic gain element designed for fixed wavelength OP-SDL operation; its AMR spectrum is markedly different with a narrow peak, again in good agreement with the simulations.

© 2011 OSA

OCIS Codes
(120.3940) Instrumentation, measurement, and metrology : Metrology
(120.5700) Instrumentation, measurement, and metrology : Reflection
(140.5960) Lasers and laser optics : Semiconductor lasers

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: June 16, 2011
Revised Manuscript: July 23, 2011
Manuscript Accepted: July 27, 2011
Published: August 15, 2011

Citation
Carl Borgentun, Jörgen Bengtsson, and Anders Larsson, "Direct measurement of the spectral reflectance of OP-SDL gain elements under optical pumping," Opt. Express 19, 16890-16897 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-18-16890


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References

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