Observation and Analysis of Phase-Locking in Parabolic Bow-Tie Laser Arrays

This paper presents experimental and theoretical results to show that in-phase coherent coupling occurs in high-power arrays of parabolic bow-tie lasers. Such devices require simple and inexpensive device fabrication, thus providing a cost-effective high-power laser for high-brightness operation at 980 nm. The maximum brightness achieved was 318 MWmiddotcm^-2 sr^-1 at 20 times the threshold with far-field full-width at half-maximum less than 1.5 times the diffraction limit, measured without the use of external lenses under low-duty cycle (0.1%) pulsed operation. Results obtained from double-slit interference experiments show a clear distinction between phase-coherent arrays and corresponding arrays of independent emitters