Title :
Farfield dynamics of broad area vertical-cavity surface-emitting lasers: onset of partially coherent emission
Author :
Mandre, S.K. ; Fischer, I. ; Elsässer, W. ; Peeters, M. ; Verschaffelt, G. ; Danckaert, J. ; Thienpont, Hugo ; Grabherr, M.
Author_Institution :
Inst. of Appl. Phys., Darmstadt Univ. of Technol.
Abstract :
This study investigates a 50 mum-aperture broad-area vertical-cavity surface-emitting laser (BA-VCSEL) and studied its temporally and spatially resolved emission behaviour. For this, an intensified CCD-camera is employed with 300 ps shutter time, with which events of the BA-VCSEL´s emission in quasi-cw operation is observed. The BA-VCSEL is pumped with 100 mus long current pulses with a repetition rate of 50 Hz. The farfield intensity distribution of the BA-VCSEL is measured. In addition, the nearfield intensity distribution is also measured by using an aspheric lens with an NA of 0.55 to image the nearfield onto the iCCD-camera
Keywords :
CCD image sensors; aspherical optics; laser beams; laser cavity resonators; lenses; light coherence; stimulated emission; surface emitting lasers; 100 mus; 50 Hz; 50 mum; aspheric lens; broad area lasers; current pulse pumping; farfield dynamics; farfield intensity distribution; intensified CCD-camera; nearfield intensity distribution; partially coherent emission; quasicontinuous-wave operation; spatially resolved emission; temporally resolved emission; vertical-cavity surface-emitting lasers; Apertures; Data communication; Laser theory; Photonics; Physics; Production; Pulse measurements; Spatial coherence; Surface emitting lasers; Vertical cavity surface emitting lasers;
Conference_Titel :
Quantum Electronics Conference, 2005. EQEC '05. European
Conference_Location :
Munich
Print_ISBN :
0-7803-8973-5
DOI :
10.1109/EQEC.2005.1567198
