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Huber, Marinus; Schweinberger, Wolfgang; Stutzki, Fabian; Limpert, Jens; Pupeza, Ioachim; Pronin, Oleg (2017): Active intensity noise suppression for a broadband mid-infrared laser source. In: Optics Express, Vol. 25, No. 19: pp. 22499-22509
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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 mu m), 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%. (C) 2017 Optical Society of America