VECSEL and spin-optoelectronics

Introduction

Vertical-external-cavity surface-emitting lasers (VECSELs) combine semiconductor gain media with cavity design as it is typical for solid-state lasers. Hence, they are also referred to as semiconductor disk lasers (SDL). They are extremely versatile and potentially high power devices with excellent beam quality (brightness converters). Current experiments are directed at spin optoelectronics in VECSELs. Previous experiments concerned

  • characterization of pulsing via direct measurements with fast single-shot oscilloscope,
  • mode-locking of VECSELs at low repetition rates as required in biophotonics by synchronous pumping,
  • in-well pumping of VECSELs.

Latest News

Spin Polarization in InGaAs quantum dots for spin-optoelectronics.

New paper in Applied Physics Letter on how the efficiency of introducing a spin polarization in InGaAs quantum dots depends on pump wavelength. Unfortunately, the wavelengths for best spin polarization and best quantum efficiency are not the same. If you are interested, please look at Appl. Phys. Lett. 126, 191102 (2025).

May 15, 2025
Spin Polarization in InGaAs quantum dots for spin-optoelectronics.
Postdeadline talk at CLEO-Europe: Evidence for spin memory.

Postdeadline talk PD-1.1: “Evidence for spin memory in photoluminescence of room temperature vertical-cavity quantum dot gain structure” at CLEO-Europe 2021

Jun 24, 2021
Postdeadline talk at CLEO-Europe: Evidence for spin memory.
Invited talk: VECSELs – An overview and specific aspects.

Invited talk: Vertical-cavity external surface-emitting lasers – An overview and specific aspects. Coherent Engineering Seminar, Coherent Inc., Santa Clara, CA, USA, Aug 12, 2011

Aug 12, 2011
Invited talk: VECSELs – An overview and specific aspects.

Publications

N. Alhosiny, S. S. Alharthi, J. Doogan, E. Clarke, T. Ackemann, Optimizing spin polarization in quantum dot vertical-gain structures through pump wavelength selection. Applied Physics Letters 126, (2025).

Cite DOI

J. Doogan, S. Phutthaprasartporn, E. Clarke, T. Ackemann, Evidence for spin memory in photoluminescence of room temperature vertical-cavity quantum dot gain structure. 2021 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) 1–1 (2021).

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T. Malica, J. Lin, T. Ackemann, D. J. Little, J. P. Toomey, D. Pabœuf, W. Lubeigt, N. Hempler, G. Malcolm, G. T. Maker, D. M. Kane, Mapping the dynamical regimes of a SESAM mode-locked VECSEL with a long cavity using time series analysis. Optics Express 26, 16624 (2018).

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W. Zhang, A. McDonald, T. Ackemann, E. Riis, G. McConnell, Femtosecond synchronously in-well pumped vertical-external-cavity surface-emitting laser. Optics Express 18, 187–192 (2010).

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C. Bückers, E. Kühn, C. Schlichenmaier, S. Imhof, A. Thränhardt, J. Hader, J. V. Moloney, O. Rubel, W. Zhang, T. Ackemann, S. W. Koch, Quantum modeling of semiconductor gain materials and vertical-external-cavity surface-emitting laser systems. Physica status solidi (b) 247, 789–808 (2010).

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