Broadband superluminescence, 5.9µm to 7.2µm, of a quantum cascade gain device

Year: 2015

Authors: Riedi S., Cappelli F., Blaser S., Baroni P.-Y., Müller A., Faist J.

Autors Affiliation: Institute for Quantum Electronics, ETH Zurich, Auguste-Piccard-Hof 1, Zurich, 8093, Switzerland; Instituto Nazionale di Ottica (INO)-CNR, European Laboratory for Non-linear Spectroscopy (LENS), Via Carrara 1, Sesto Fiorentino FI, 50019, Italy; Alpes Lasers SA, 1-3 Passage Maximilien-de-Meuron, Neuchâtel, 2000, Switzerland

Abstract: The broadband electroluminescence of a quantum cascade device based on a multi-color active region covering the wavelengths 5.9µm-7.2µm was measured. Anti-reflection coatings were applied on both cleaved facets to remove the Fabry-Pérot cavity and prevent the device from lasing. This allows the latter to be studied either as a superluminescent diode or a single-pass amplifier in order to determine its suitability as a source for low speckle imaging applications. At 243 K, the amplified spontaneous emission has a peak power of 38µW that agrees well with a simple model of spontaneous emission intensity. The light of a similar structure could be modulated up to 1 GHz, limited by the RC constant of the device. The peak gain was measured from high-resolution luminescence spectra and determined to be 6.3 cm-1, corresponding to a single-pass gain of 1.89.

Journal/Review: OPTICS EXPRESS

Volume: 23 (6)      Pages from: 7184  to: 7189

KeyWords: Cascade connections; Light; Luminescence, Amplified spontaneous emissions; High resolution luminescence spectra; Quantum cascades; Quantum-cascade devices; Simple modeling; Single pass amplifiers; Superluminescence; Superluminescent diode, Spontaneous emission
DOI: 10.1364/OE.23.007184

Citations: 14
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