Phase-resolved measurements of stimulated emission in a laser

Josef Kröll, Juraj Darmo, Sukhdeep S. Dhillon, Xavier Marcadet, Michel Calligaro, Carlo Sirtori and Karl Unterrainer ()
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Josef Kröll: Photonics Institute, Vienna University of Technology, Gusshausstrasse 25-29, A-1040 Vienna, Austria
Juraj Darmo: Photonics Institute, Vienna University of Technology, Gusshausstrasse 25-29, A-1040 Vienna, Austria
Sukhdeep S. Dhillon: Matériaux et Phénomènes Quantiques, Université Paris 7
Xavier Marcadet: Alcatel-Thales III-V Lab, 91767 Palaiseau Cedex, France
Michel Calligaro: Alcatel-Thales III-V Lab, 91767 Palaiseau Cedex, France
Carlo Sirtori: Matériaux et Phénomènes Quantiques, Université Paris 7
Karl Unterrainer: Photonics Institute, Vienna University of Technology, Gusshausstrasse 25-29, A-1040 Vienna, Austria

Nature, 2007, vol. 449, issue 7163, 698-701

Abstract: A measured approach Laser radiation is usually measured with detectors that determine frequency and intensity, but gather no information about the phase of the radiation. By measuring the phase it would become possible to gain insights in the dynamic processes of optical amplification and attenuation underlying laser operation. Kröll et al. have now developed a way of measuring amplitude as well as phase of laser radiation from so-called quantum cascade lasers, which operate in the terahertz regime. The technique, which could be extended to other types of lasers, can be used to study effects leading to optical losses — useful information to improve the laser performance.

Date: 2007
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DOI: 10.1038/nature06208

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