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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 14, Iss. 3 — Feb. 6, 2006
  • pp: 1094–1105

Cavity Q, mode volume, and lasing threshold in small diameter AlGaAs microdisks with embedded quantum dots

Kartik Srinivasan, Matthew Borselli, Oskar Painter, Andreas Stintz, and Sanjay Krishna  »View Author Affiliations

Optics Express, Vol. 14, Issue 3, pp. 1094-1105 (2006)

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The quality factor (Q), mode volume (V eff ), and room-temperature lasing threshold of microdisk cavities with embedded quantum dots (QDs) are investigated. Finite element method simulations of standing wave modes within the microdisk reveal that Veff can be as small as 2(λ/n)3 while maintaining radiation-limited Qs in excess of 105. Microdisks with a 2 μm diameter are fabricated in an AlGaAs material containing a single layer of InAs QDs with peak emission at λ = 1317 nm. For devices with Veff ~2 (λ/n)3, Qs as high as 1.2× 105 are measured passively in the 1.4 μm band, using an optical fiber taper waveguide. Optical pumping yields laser emission in the 1.3 μm band, with room temperature, continuous-wave thresholds as low as 1 μW of absorbed pump power. Out-coupling of the laser emission is also shown to be significantly enhanced through the use of optical fiber tapers, with a laser differential efficiency as high as ξ ~ 16% and out-coupling efficiency in excess of 28% measured after accounting for losses in the optical fiber system.

© 2006 Optical Society of America

OCIS Codes
(140.5960) Lasers and laser optics : Semiconductor lasers
(230.5750) Optical devices : Resonators
(270.0270) Quantum optics : Quantum optics

ToC Category:
Lasers and Laser Optics

Original Manuscript: November 17, 2005
Revised Manuscript: January 13, 2006
Manuscript Accepted: January 24, 2006
Published: February 6, 2006

Kartik Srinivasan, Matthew Borselli, Oskar Painter, Andreas Stintz, and Sanjay Krishna, "Cavity Q, mode volume, and lasing threshold in small diameter AlGaAs microdisks with embedded quantum dots," Opt. Express 14, 1094-1105 (2006)

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