Combinaison cohérente de diodes laser de puissance

Guillaume Schimmel 1
1 Laboratoire Charles Fabry / Lasers
LCF - Laboratoire Charles Fabry
Abstract : Scaling up the brightness of laser diodes is a major research objective in the laser community. The coherent beam of several emitters is the most efficient technique to increase the brightness by constructive interference. An efficient combination can only be achieved in an arrangement that forces the required phase relation between the emitters. Different approaches are investigated: either active phase-locking of amplifiers seeded by a single-frequency laser split into N beams and amplified in parallel, or passive selforganization of emitters in a common laser cavity. We investigate a new coherent combining architecture using a common extended cavity on the back side of diode lasers for phase locking. As a result, the efficiency of the phase-locked laser cavity is increased as compared to standard front-side configurations. Moreover, such an extended cavity placed on the rear-side provides the strong optical feedback required for phase-locked operation. This configuration is demonstrated with high-brightness tapered devices, highlighting the capability of such setup for high power operation. This architecture is then extended to diode laser arrays by the use of diffractive optical elements.
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  • HAL Id : tel-01445295, version 1

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Guillaume Schimmel. Combinaison cohérente de diodes laser de puissance. Optique [physics.optics]. Université Paris-Saclay, 2016. Français. ⟨NNT : 2016SACLO018⟩. ⟨tel-01445295⟩

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