Design On Slab-coupled Optical Waveguide Semiconductor Laser Structure

High-power single-mode semiconductor lasers are of a variety of applications including free-space optical communications, pumping fiber amplifiers and laser radars and slab-coupled optical waveguide structure has becoming the desirable structure design for high-power semiconductor. This paper discussed mainly on the structure design and simulation analysis of 808-nm AlGaAs/GaAs slab-coupled optical waveguide laser(SCOWL). SCOWL devices combine slab-coupled waveguide theory with quantum-well technology. Because the device utilizes a relatively wider waveguide which ensures the high-power single-mode output beam and the divergence angle of the output beam is small,so we can attain a near-circular mode profile. This paper simply explained the working principle of the SCOWL as well as introduced several SCOWL devices which were reported before and its output characteristics. Based on these, we designed an 808-nm SCOWL,optimized the structure on material selection, waveguide design and quantum-well structure and explored SCOWL structure and its performance.The Lastip module of Crosslight software was employed to simulate and analyze the808-nm SCOWL device. The device we designed shows several fine output characteristics with single mode. We can achieve 1W output power at 1130 mA and the full-width-half maximum(FWHM) of the beam was 12.5°×8.6° with nearly circular mode profile. Through our simulation analysis and comparison, it is evident that our designed device was reasonable and can be researched for further application.