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Proceedings Paper

Measurement of cavity loss and threshold gain in a vertical-cavity surface-emitting laser using an external mirror
Author(s): K. H. Ha
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Paper Abstract

The threshold gain and the cavity loss are important parameters for the optimum design of vertical-cavity surface-emitting lasers(VCSELs). The internal loss is commonly determined from the dependence of the external slope efficiency on cavity length[1]. This method inevitably assumes that internal loss is same for each devices. Here we try to determine the cavity loss by varying the amount of light fed back to the VCSEL using an external mirror. The schematic diagram of the experimental setup is shown in Fig. 1. The tested VCSEL consists of super lattice structure surrounded by AlAs/Al0.3Ga0.7As distributed Bragg reflectors. Current is constricted by proton implantation outside a 15- μm diameter circle. A 15- μp m opening in the p-metalization acts as an output aperture. In the continuous wave operation, the threshold current of VCSEL undergoes a periodic change depending on the external cavity length. We found the position of the minimum threshold current by using a piezo-electric translator to the external mirror. Then, we measured the threshold current for different values of feedback.

Paper Details

Date Published: 1 September 1996
PDF: 2 pages
Proc. SPIE 2778, 17th Congress of the International Commission for Optics: Optics for Science and New Technology, 27788G (1 September 1996); doi: 10.1117/12.2315993
Show Author Affiliations
K. H. Ha, Korea Advanced Institute of Science and Technology (Korea, Republic of)

Published in SPIE Proceedings Vol. 2778:
17th Congress of the International Commission for Optics: Optics for Science and New Technology
Joon-Sung Chang; Jai-Hyung Lee; ChangHee Nam, Editor(s)

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