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Active intensity noise suppression for a broadband mid-infrared laser source

 
: Huber, M.; Schweinberger, W.; Stutzki, F.; Limpert, J.; Pupeza, I.; Pronin, O.

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Optics Express 25 (2017), No. 19, pp. 22499-22509
ISSN: 1094-4087
English
Journal Article, Electronic Publication
Fraunhofer IOF ()

Abstract
Excess relative intensity noise (RIN) constitutes one of the major limitations of most spectroscopic methods involving lasers. Here, we present an active RIN suppression scheme for a coherent mid-infrared (MIR) light source (8.4-11 µm), based on intra-pulse difference frequency generation (DFG). Three different stabilization concepts that rely on modulating the intensity of the driving near-infrared (NIR) pulse train with an acousto-optic modulator are investigated and compared. By using the wings of the NIR spectrum to generate the error signal, a RIN suppression of the MIR pulse train of up to a factor of 20 was achieved in the band between 1 Hz and 100 kHz, resulting in a total integrated RIN of 0.07%.

: http://publica.fraunhofer.de/documents/N-509725.html