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Proceedings Paper

Wavelength tunable red AlGaInP-VECSEL emitting at around 660 nm
Author(s): Thomas Schwarzbäck; Hermann Kahle; Marcus Eichfelder; Wolfgang-Michael Schulz; Robert Roßbach; Michael Jetter; Peter Michler
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Paper Abstract

We present a non-resonantly pumped red-emitting vertical external cavity surface-emitting laser system based on a multi-quantum-well structure with 20 compressively-strained GaInP quantum wells for an operation wavelength between 645-675 nm. Five quantum well packages with four quantum wells are placed in a separate confinement heterostructure in a resonant periodic gain design in quaternary AlGaInP barriers and cladding layers, respectively. The 3 λ cavity is fabricated on a 55 λ/4 pairs Al0.50Ga0.50As/AlAs distributed Bragg reflector. By bonding an intra-cavity diamond heatspreader to the chip, continuous-wave operation exceeding 700mW output power at a wavelength of 662 nm with a low threshold power of 0.8W was achieved. A thermal resistance value of R1 = 5K/W and R2 = 7K/W could be determined for our setup at operation heatsink temperatures of Ths = -28°C and Ths = 16°C, respectively. Measurements of the slope efficiency within a v-type cavity with different outcoupling mirror reflectivities lead to a cavity round-trip transmission factor of Tloss = 98.6% and an absorption efficiency of ηabs = 17.6%. Using a birefringent filter in a folded cavity, a maximum tuning range of 22 nm at a center wavelength of 667 nm could be shown. With this method wavelengths below 650 nm were observed. Utilizing a non-linear crystal for intra-cavity frequency doubling in this cavity geometry, coherent emission down to 322 nm could be detected. In the UV spectral range, a maximum tuning range of 10 nm could be measured at a center wavelength of 330 nm, so we could match the HeCd laser line at 325 nm.

Paper Details

Date Published: 21 February 2011
PDF: 10 pages
Proc. SPIE 7919, Vertical External Cavity Surface Emitting Lasers (VECSELs), 79190B (21 February 2011); doi: 10.1117/12.873558
Show Author Affiliations
Thomas Schwarzbäck, Univ. of Stuttgart (Germany)
Hermann Kahle, Univ. of Stuttgart (Germany)
Marcus Eichfelder, Univ. of Stuttgart (Germany)
Wolfgang-Michael Schulz, Univ. of Stuttgart (Germany)
Robert Roßbach, Univ. of Stuttgart (Germany)
Michael Jetter, Univ. of Stuttgart (Germany)
Peter Michler, Univ. of Stuttgart (Germany)

Published in SPIE Proceedings Vol. 7919:
Vertical External Cavity Surface Emitting Lasers (VECSELs)
Ursula Keller, Editor(s)

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