Title :
Spatio-spectral mapping of multimode vertical cavity surface emitting lasers
Author :
Knopp, Kevin J. ; Christensen, David H. ; Vander Rhodes, Greg ; Pomeroy, Joshua M. ; Goldberg, Bennett B. ; Ünlü, M. Selim
Author_Institution :
Nat. Inst. of Stand. & Technol., Boulder, CO, USA
fDate :
8/1/1999 12:00:00 AM
Abstract :
This paper reports the spatial and spectral characteristics of multimode vertical cavity surface emitting laser (VCSEL) emission using near field scanning optical microscopy (NSOM). We have investigated 15 μm diameter proton implanted 850 nm devices used in 2 Gb/s multimode fiber optic links. We have studied their near field spatial distribution of intensity and the lasing wavelengths of their transverse modes. False colored images were created to portray relative intensity, and spatial distribution information for each transverse mode. Correlation with shear force data allowed mapping of the optical distributions to topographical features of the device. Lasing filaments were observed at high drive currents. Spatially overlapping transverse modes were observed to compete for available gain while spatially isolated modes coexisted
Keywords :
laser modes; near-field scanning optical microscopy; optical testing; optical transmitters; semiconductor device testing; semiconductor lasers; surface emitting lasers; 15 mum; 2 Gbit/s; 850 nm; Gb/s multimode fiber optic links; VCSEL emission; false colored images; high drive currents; lasing wavelengths; multimode vertical cavity surface emitting lasers; near field scanning optical microscopy; near field spatial distribution; optical distributions; relative intensity; shear force data; spatial distribution information; spatially isolated modes; spatially overlapping transverse modes; spatio-spectral mapping; topographical features; transverse mode; transverse modes; Fiber lasers; Laser modes; Optical fibers; Optical microscopy; Optical surface waves; Protons; Stimulated emission; Surface emitting lasers; Surface topography; Vertical cavity surface emitting lasers;
Journal_Title :
Lightwave Technology, Journal of
