This paper presents results of computer simulation of 1D monolithic high refractive index contrast grating (MHCG) reflector also called surface grating reflector (SGR). We analyzed optical properties of the GaAs reflector designed for 980 nm wavelength with respect to the grating parameters variation. We also determined the electric field patterns after reflection from the structure in several cases of parameters variation. We show that thanks to the scalability and design simplicity, proposed design is a promising candidate for simple, next generation vertical cavity surface emitting lasers emitting from ultra-violet to infrared.
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.