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Quiet cascade: measuring QCL intrinsic linewidth

  Articoli su Riviste JCR/ISI  (anno 2010)

Autori:  Bartalini S., Borri S., Cancio P., Castrillo A., Galli I., Giusfredi G., Mazzotti D., Gianfrani L., De Natale P

Affiliazione Autori:  Istituto Nazionale di Ottica (INO) - CNR European Laboratory for Non-linear Spectroscopy (LENS) Dipartimento di Scienze Ambientali, Seconda Università di Napoli

Riassunto:  Researchers demonstrated direct evidence of an intrinsic linewidth of a few hundred hertz for these sources through their investigation of the frequency-noise spectral density of a free-running mid-infrared (IR) quantum-cascade laser (QCL). The researchers measured a QCL intrinsic linewidth, using the latest instrumentation with significant low noise. They tuned a 4.33-µm-emitting QCL half-way down a carbon dioxide absorption peak to test the prediction. The demonstration that QCLs have peculiar noise features provided experimental evidence of a linewidth narrowing beyond the limit set by the spontaneous emission rate. These measurements led to a better understanding of QCLs and to improved designs of their quantum-well structure.

Volume n.:  21 (12)      Pagine da: 32  a: 32
DOI: 10.1364/OPN.21.12.000032

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