Title:	Fully–correlated multi–mode pumping for low–noise dual–frequency VECSELs
Authors:	Gredat, Grégory Chatterjee, Debanuj Baili, Ghaya Gutty, François Sagnes, Isabelle Goldfarb, Fabienne Bretenaker, Fabien Li, Hui
Issue Date:	1-Oct-2018
Publisher:	Optical Society of America
Citation:	Optics Express, 2018, Vol.26, p26217-26226
Abstract:	We report a fully–correlated multi–mode pumping architecture optimized for dramatic noise reduction of a class–A dual–frequency Vertical External Cavity Surface Emitting Laser (VECSEL). Thanks to amplitude division of a laser diode, the two orthogonally polarized modes emitted by the VECSEL oscillating at 852 nm are separately pumped by two beams exhibiting fully in–phase correlated intensity noises. This is shown to lead to very strong and in–phase correlations between the two lasing modes intensities. As a result, the phase noise power spectral density of the RF beat note generated by the two modes undergoes a drastic reduction of about 10 to 20 dB throughout the whole frequency range from 10 kHz to 20 MHz and falls below the detection floor above a few MHz. A good agreement is found with a model which uses the framework of rate equations coupled by cross–saturation. The remaining phase noise is attributed to thermal effects and additional technical noises and lies mainly within the bandwidth of a phase–locked–loop.
Description:	Open Access
URI:	http://hdl.handle.net/2289/7018
ISSN:	1094-4087 (online)
Alternative Location:	https://doi.org/10.1364/OE.26.026217
Copyright:	2018 Optical Society of America
Appears in Collections:	Research Papers (LAMP)

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