Demonstration of finite-aperture tapered unstable resonator lasers

Bedford, Robert; Schillgalies, Marc; Fallahi, Mahmoud
August 2003
Applied Physics Letters;8/4/2003, Vol. 83 Issue 5, p822
Academic Journal
In this letter, we report experimental results of semiconductor lasers that incorporate a mirror with finite lateral extent at the output of a semiconductor tapered laser in InAlGaAs/InGaAsP/InP. We directly compare the "finite-aperture" tapered unstable resonator laser to that of the conventional "infinite-aperture" tapered laser. Using the finite aperture, we show the differential quantum efficiency is increased by 40%. Additionally, the beam is coupled out of the laser cavity using a grating, allowing for a quasicircular, low-divergence beam with no external optics.


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