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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 22 — Oct. 22, 2012
  • pp: 24791–24802

Gain characterization and passive modelocking of electrically pumped VECSELs

W.P. Pallmann, C.A. Zaugg, M. Mangold, V.J. Wittwer, H. Moench, S. Gronenborn, M. Miller, B.W. Tilma, T. Südmeyer, and U. Keller  »View Author Affiliations


Optics Express, Vol. 20, Issue 22, pp. 24791-24802 (2012)
http://dx.doi.org/10.1364/OE.20.024791


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Abstract

Linear and nonlinear gain characterization of electrically pumped vertical external cavity surface emitting lasers (EP-VECSELs) is presented with spectrally resolved measurements of the gain and with gain saturation measurements of two EP-VECSEL samples with different field enhancement in the quantum-well gain layers. The spectral bandwidth, small-signal gain and saturation fluence of the devices are compared. Using the sample with the larger bandwidth, we have demonstrated the shortest pulses generated from a passively modelocked EP-VECSEL to date. With a low-saturation-fluence SESAM for passive modelocking we have achieved 9.5-ps pulses with 7.6 mW average output power at a repetition rate of 1.4 GHz. With a higher output coupler transmission the pulse duration was increased to 31 ps with an average output power of 13.6 mW. The pulses were chirped mainly due to the group delay dispersion (GDD) introduced by the intermediate DBR, which compensates the optical loss in the structure.

© 2012 OSA

OCIS Codes
(140.4050) Lasers and laser optics : Mode-locked lasers
(140.5960) Lasers and laser optics : Semiconductor lasers
(140.7270) Lasers and laser optics : Vertical emitting lasers

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: September 7, 2012
Revised Manuscript: October 8, 2012
Manuscript Accepted: October 8, 2012
Published: October 15, 2012

Citation
W.P. Pallmann, C.A. Zaugg, M. Mangold, V.J. Wittwer, H. Moench, S. Gronenborn, M. Miller, B.W. Tilma, T. Südmeyer, and U. Keller, "Gain characterization and passive modelocking of electrically pumped VECSELs," Opt. Express 20, 24791-24802 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-22-24791


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