A 95-nm-wide Tunable Two-Mode Vertical External Cavity Surface-Emitting Laser

We report on a wide tunability of an optically pumped semiconductor vertical external cavity surface-emitting laser with a unique two-mode resonant microcavity. Using only high-reflectivity mirrors in the resonator and controlling the active region temperature by readjustment of pump power and heat extraction, we have demonstrated a record 95-nm wavelength-tuning range. Laser center wavelength was 985 nm.