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We report a fully-correlated multi-mode pumping architecture optimized fordramatic noise reduction of a class-A dual-frequency Vertical External CavitySurface Emitting Laser (VECSEL). Thanks to amplitude division of a laser diode,the two orthogonally polarized modes emitted by the VECSEL oscillating at 852nm are separately pumped by two beams exhibiting fully in--phase correlatedintensity noises. This is shown to lead to very strong and in-phasecorrelations between the two lasing modes intensities. As a result, the phasenoise power spectral density of the RF beat note generated by the two modesundergoes a drastic reduction of about 10 to 20 dB throughout the wholefrequency range from 10 kHz to 20 MHz and falls below the detection floor abovea few MHz. A good agreement is found with a model which uses the framework ofrate equations coupled by cross--saturation. The remaining phase noise isattributed to thermal effects and additional technical noises and lies mainlywithin the bandwidth of a phase-locked-loop.

Fully-correlated pumping for dual-frequency VECSELs dedicated to cesium CPT clocks