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Opt Express. 2013 Aug 12;21(16):19180-6. doi: 10.1364/OE.21.019180.

Quantum cascade laser in a master oscillator power amplifier configuration with Watt-level optical output power.

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Institute for Quantum Electronics, Swiss Federal Institute of Technology (ETH) Zürich, Wolfgang-Pauli-Strasse 16, 8093 Zürich, Switzerland.


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.

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