Title :
Coherence of VCSEL´s for holographic interconnects
Author :
Chilla, J.L.A. ; Benware, B. ; Watson, M.E. ; Stanko, P. ; Rocca, J.J. ; Wilmsen, C. ; Feld, S. ; Leibenguth, R.
Author_Institution :
Center for Optoelectron. Comput. Syst., Colorado State Univ., Fort Collins, CO, USA
fDate :
5/1/1995 12:00:00 AM
Abstract :
Temporal and spatial coherence measurements were conducted on the emission from AlGaAs-GaAs vertical-cavity surface-emitting lasers (VCSEL´s). Results of both CW and pulsed conditions from devices of 8- and 15-μm diameter are reported. Coherence length of 0.6 mm for multi-mode and /spl sim/75 cm for single-mode were obtained. Thermal chirp reduces the single-mode coherence to 16 mm for 5 ns pulses. For holograms smaller than 0.6 mm in size the density of information that can be read by the VCSEL´s is diffraction-limited by the size of the holographic element.
Keywords :
III-V semiconductors; aluminium compounds; chirp modulation; coherence length; gallium arsenide; holographic optical elements; laser cavity resonators; laser modes; light coherence; optical interconnections; optical modulation; semiconductor lasers; surface emitting lasers; 0.6 mm; 5 ns; 8 to 15 mum; AlGaAs-GaAs; AlGaAs-GaAs vertical-cavity surface-emitting lasers; CW lasers; VCSEL coherence; coherence length; diffraction-limited; emission; holograms; holographic element size; holographic interconnects; multi-mode; pulsed conditions; single-mode; single-mode coherence; spatial coherence measurements; temporal coherence measurements; thermal chirp; Coherence; Holography; Mirrors; Optical arrays; Optical computing; Optical interferometry; Optical pulses; Surface emitting lasers; Vertical cavity surface emitting lasers; Wavelength measurement;
Journal_Title :
Photonics Technology Letters, IEEE
