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/content/aip/journal/adva/6/1/10.1063/1.4940760
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/content/aip/journal/adva/6/1/10.1063/1.4940760
2016-01-22
2016-12-09

Abstract

Operation of continuous wavequantum cascade lasers with a frequency-shifted feedback provided by an acousto-opticmodulator is reported. Measured linewidth of 1.7 cm−1 for these devices, under CW operating conditions, was in a good agreement with predictions of a model based on frequency-shifted feedback seeded by spontaneous emission.Linewidth broadening was observed for short sweep times, consistent with sound wavegrating period variation across the illuminated area on the acousto-opticmodulator. Standoff detection capability of the AOM-based QCL setup was demonstrated for several solid materials.

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