Wavelength stabilization and mode selection of a GaSb-based semiconductor disk laser at 2 µm by using a volume Bragg grating

Optically pumped semiconductor disk laser (OPSDL) based on the (AlGaIn)(AsSb) unify preferable features from semiconductor and solid state lasers, therefore they can be an excellent source in this wavelength region. To realize this with standard laser setups is quite difficult. For the first time on an OPSDL system in the 2 mum wavelength region with a volume Bragg grating (VBG) as output coupler and for wavelength selection and stabilization is reported. The approximately 10 mum thick monolithically grown OPSDL device structure comprised a high quality AlAsSb/GaSb distributed Bragg reflector with reflectivity >99.5%. For the laser experiments square peaces of 3x3 mm were used. To improve the heat removal from the active region a 0.4 mm thick SiC heat spreader was attached to the surface by liquid capillary bonding.