Spectral modification of the laser emission of a terahertz quantum cascade laser induced by broad-band double pulse injection seeding

Journal Article · Mon Sep 14 00:00:00 EDT 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4930993· OSTI ID:22482065

Markmann, Sergej; Nong, Hanond; Hekmat, Negar; Jukam, Nathan ^[1]; Pal, Shovon ^[1]; Scholz, Sven; Kukharchyk, Nadezhda; Ludwig, Arne; Wieck, Andreas D. ^[2]; Dhillon, Sukhdeep; Tignon, Jérôme ^[3]; Marcadet, Xavier ^[4]; Bock, Claudia; Kunze, Ulrich ^[5]

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1. AG Terahertz Spektroskopie und Technologie, Ruhr-Universität Bochum, D-44780 Bochum (Germany)
2. Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum, D-44780 Bochum (Germany)
3. Laboratoire Pierre Aigrain, Ecole Normale Supérieure, UMR 8551 CNRS, UPMC, Univ. Paris 6, 75005 Paris (France)
4. Alcatel-Thales III-V Lab, Route Départementale 128, 91767 Palaiseau Cedex (France)
5. Lehrstuhl für Werkstoffe und Nanoelektronik, Ruhr-Universität Bochum, D-44780 Bochum (Germany)

We demonstrate by injection seeding that the spectral emission of a terahertz (THz) quantum cascade laser (QCL) can be modified with broad-band THz pulses whose bandwidths are greater than the QCL bandwidth. Two broad-band THz pulses delayed in time imprint a modulation on the single THz pulse spectrum. The resulting spectrum is used to injection seed the THz QCL. By varying the time delay between the THz pulses, the amplitude distribution of the QCL longitudinal modes is modified. By applying this approach, the QCL emission is reversibly switched from multi-mode to single mode emission.

• OSTI ID: 22482065
• Journal Information: Applied Physics Letters, Vol. 107, Issue 11; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AMPLITUDES
DISTRIBUTION
EMISSION
LASERS
MODULATION
PULSES
SPECTRA