Wide bandwidth phase-locked diode laser with an intra-cavity electro-optic modulator

Julien Le Gouët (1, 2) , J. Kim (3) , Charles Bourassin-Bouchet (1, 2) , Michel Lours (1, 2) , Arnaud Landragin (1, 2) , Franck Pereira dos Santos (1, 2)

1 SYRTE - Systèmes de Référence Temps Espace
2 Interférométrie Atomique et Capteurs Inertiels
3 Department of Physics, Myongji University

Two extended cavity laser diodes are phase-locked, thanks to an intra-cavity electro-optical modulator. The phase-locked loop bandwidth is on the order of 10 MHz, which is about twice larger than when the feedback correction is applied on the laser current. The phase noise reaches -120 dBrad²/Hz at 10 kHz. This new scheme reduces the residual laser phase noise, which constitutes one of the dominant contributions in the sensitivity limit of atom interferometers using two-photon transitions.

Domaines: Astrophysique [astro-ph]

Julien Le Gouët, J. Kim, Charles Bourassin-Bouchet, Michel Lours, Arnaud Landragin, et al.. Wide bandwidth phase-locked diode laser with an intra-cavity electro-optic modulator. Optics Communications, 2009, 282, pp.977-980. ⟨10.1016/j.optcom.2008.11.055⟩. ⟨hal-03785246⟩