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  • Tunable IR Quantum Cascade Laser Demonstrated

Photonics Spectra
Jan 2001
A team at the Technical University of Vienna in Austria announced that it has constructed tunable distributed-feedback quantum cascade lasers with a peak emission at 9.35 µm. The surface-emitting devices may find applications in chemical sensing and pollution monitoring.

The researchers grew layers of GaAs, AlGaAs and InGaAs by molecular beam epitaxy on a substrate of N-doped GaAs, and transferred a second-order Bragg grating into the surface with reactive ion etching. The temperature of the heat sink determined the wavelength of the 100-mW single-mode emission from the device, which the team described in the Oct. 2, 2000, issue of Applied Physics Letters.

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