Quantum cascade laser in a master oscillator power amplifier configuration with Watt-level optical output power.
We present the design and realization of short-wavelength (λ = 4.53 μm) and buried-heterostructure quantum cascade lasers in a master oscillator power amplifier configuration. Watt-level, singlemode peak optical output power is demonstrated for typical non-tapered 4 μm wide and 5.25 mm long devices. Farfield measurements prove a symmetric, single transverse-mode emission in TM(00)-mode with typical divergences of 25° and 27° in and perpendicular to growth direction, respectively. We demonstrate singlemode tuning over a range of 7.9 cm(-1) for temperatures between 263K and 313K and also singlemode emission for different driving currents. The side mode suppression ratio is measured to be higher than 20 dB.
Institute for Quantum Electronics, Swiss Federal Institute of Technology (ETH) Zürich, Wolfgang-Pauli-Strasse 16, 8093 Zürich, Switzerland. bhinkov@phys.ethz.ch
Borislav
B
Hinkov
Mattias
M
Beck
Emilio
E
Gini
Jérôme
J
Faist