PROJECT TITLE :
Wavelength beam combining of VECSELs using multiplexed volume Bragg gratings in a compound cavity
A method of wavelength beam combining to boost the overall output brightness of vertical external cavity surface emitting lasers (VECSELs) using multiplexed volume Bragg gratings (MVBGs) is presented. The MVBGs are designed to introduce wavelength-specific feedback for the 1020 nm close to-infrared wavelength VECSELs to realize both spectral stabilisation and beam combining effects. In conjunction with the compound cavity arrangement, a combined output of >vi W is achieved with >98percent combining efficiency using 2 VECSELs. The beam combining scheme produces close to-diffraction limited output with enhanced spectral density and wavelength-stabilised characteristics.
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