High brightness index-guided parabolic bow-tie laser arrays

This letter describes a novel 980-mn parabolic bow-tie laser array (PBTLA) that is suitable for high-power and high-brightness operation. Output powers in excess of 2.5 W/facet pulsed in a 1degrees (lateral) beam, less than twice the diffraction limit, corresponding to 275 MW(.)cm(-2.)sr(-1) brightness, have been measured without the use of external lenses from uncoated PBTLAs fabricated in-house (top metal contact surface area similar to 0.1 mm(2)). Experimental results presented in this letter indicate that coherence effects are significant in the operation of such devices. Theoretical models based on the simple diffraction theory and on the coupled-mode theory have been used to interpret the experimental results.