Title :
Single-Mode Emission From Vertical-Cavity Surface-Emitting Lasers With Low-Index Defects
Author :
Bao, Ling ; Kim, Nam-Heon ; Mawst, Luke J. ; Elkin, N.N. ; Troshchieva, V.N. ; Vysotsky, D.V. ; Napartovich, A.P.
Author_Institution :
Dept. of Electr. & Comput. Eng., Wisconsin Univ., Madison, WI
Abstract :
Mode confinement to low-index "defect" regions of a two-dimensional square photonic lattice has been studied as a means to realize single-spatial-mode vertical-cavity surface-emitting lasers (VCSELs). A selective etching process with two-step metal-organic chemical vapor deposition is used to fabricate the low-index defect VCSELs. A device with a 9-mum-wide aperture demonstrates 2.9-mW continuous-wave (CW) output power. The near diffraction-limited single-lobe far-field and high-resolution spectral analyses confirm single fundamental defect mode emission. Comparison studies between pulsed and CW operation indicate that thermal effects have a significant impact on the modal performance of the devices. Single-mode emission with more than 8 mW of peak pulsed power has been observed with short pulsewidth operation (0.1 mus, 2%). Improvements in thermal management are required to achieve higher CW single-mode emission in these devices
Keywords :
laser modes; laser stability; semiconductor lasers; surface emitting lasers; 2.9 mW; 9 mum; VCSEL; low-index defect; metal-organic chemical vapor deposition; mode confinement; selective etching; thermal effects; two-dimensional square photonic lattice; vertical-cavity surface-emitting lasers; Apertures; Chemical lasers; Chemical vapor deposition; Etching; Laser modes; Lattices; Pulsed laser deposition; Surface emitting lasers; Thermal management; Vertical cavity surface emitting lasers; Antiguide; diode laser; metal–oxide chemical vapor deposition (MOCVD); photonic lattice; vertical-cavity surface-emitting laser (VCSEL);
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2006.890058
