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Dr. Borislav Hinkov

Institute of Quantum Electronics, Swiss Federal Institute of Technology (ETH), Zurich, Switzerland

Friday, April 13th, 2012 at 11:00:00 AM  

Conference room Querzoli - LENS - via Nello Carrara 1 - Sesto Fiorentino (Florence)

Published on-line at 08:21:00 PM on Tuesday, April 3rd, 2012

Mid-infrared emitting Quantum Cascade Lasers

From basic principles to the last progress in quantum cascades laser physics.

Quantum cascade (QC) lasers are semiconductor-based coherent light sources emitting in the mid-infrared to THz spectral region (2.6 - 300 μm). Since their first demonstration in 1994 (see J. Faist, F. Capasso, D. L. Sivco, C. Sirtori, A. L. Hutchinson, and A. Y. Cho, "Quantum Cascade Laser", Science 264, 1994), tremendous progress has been achieved concerning continuous-wave (CW-) operation, Watt-level output power and high wallplug efficiencies (> 20%), large spectral tuning (> 410 cm-1 with > 39% of central frequency) and accessing the short-wavelength spectral region (~3 μm).

Due to the much stronger absorption lines of many different chemical species like CO2, N2O or CH4 in the mid-IR than the overtones in the near-IR (~1 μm) spectral region, QC lasers are sources suitable for high-resolution spectroscopy in this wavelength range. Other typical applications are optical free-space communication, infrared countermeasures and medical surgery.

This presentation will give an introduction to the basic principle of QC lasers and the progress since their invention. Based on two examples current research interests will be presented.

[video=720 510]20120413_hinkov[/video]

For further informations, please contact Dr. Paolo De Natale.