High quality 2-μm GaSb-based optically pumped semiconductor disk laser grown by molecular beam epitaxy

The epitaxial growth conditions and performance of a diode-pumped GaSb-based optically pumped semiconductor disk laser (SDL) emitting near 2.0 μm in an external cavity configuration are reported. The high quality epitaxial structure, grown on Te-doped (001) oriented GaSb substrate by molecular beam epitaxy, consists of a distributed Bragg reflector (DBR), a multi-quantum-well gain region, and a window layer. An intra-cavity SiC heat spreader was attached to the gain chip for effective thermal management. A continuous-wave output power of over 1 W operating at 2.03 μ wavelength operating near room temperature was achieved using a 3% output coupler.