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22 January 2013 VECSELs emitting at 976nm designed for second harmonic generation in the blue wavelength region
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Proceedings Volume 8702, Laser Technology 2012: Progress in Lasers; 87020A (2013)
Event: Tenth Symposium on Laser Technology, 2012, Szczecin, Poland
Using a Vertical Cavity Surface Emitting Laser (VECSEL) “as-grown” heterostructure we set-up a laser emitting at 488 nm with the output power approaching 20mW. The short wavelength emission was due to the conversion of the 976nm emission by a second harmonic generation process in a type-I lithum triborate (LBO). The V-type external cavity permitted efficient focusing of the laser beam on both the VECSEL heterostructure and the non linear crystal. A small diameter focused spot on the gain mirror is required when “as-grown” heterostructures are used. No birefringent filter was used in the resonator. In the case of our heterostructure we observed that the light was spontaneously polarized along the one of the crystallographic direction. The polarization ratio was 1000:1. The VECSEL heterostructure was of the resonant type strongly enhancing a single wavelength emission. The wavelength fine tuning was performed by heatsink temperature adjustment. The heterostructure was grown by molecular beam epitaxy. It consisted of 12 InGaAs quantum wells enclosed by GaAs barriers and a AlAs/GaAs DBR.
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Jan Muszalski, Artur Broda, Agata Jasik, Anna Wójcik-Jedlińska, Artur Trajnerowicz, Justyna Kubacka-Traczyk, and Iwona Sankowskaa "VECSELs emitting at 976nm designed for second harmonic generation in the blue wavelength region", Proc. SPIE 8702, Laser Technology 2012: Progress in Lasers, 87020A (22 January 2013);

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