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Proceedings Paper

850nm VCSEL with a liquid crystal overlay
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Paper Abstract

We developed an in- house technology to overlay liquid crystal (LC) on top of a 850nm Vertical Cavity Surface Emitting Laser (VCSEL) creating a so-called LC-VCSEL. Prior to this, the effect of the cell thickness on the planar alignment of the E7 LC is investigated. It is observed that the LC orientation is planar, uniformly aligned over the whole cell with an average pre-tilt of 22.50 in a thin a cell of 13μm thickness; such alignment uniformity is not observed in a thick cell of 125μm. Nevertheless, several domains of good uniformity are still present. Further, the polarization resolved LI characteristics of LC-VCSEL are investigated with and without the insertion of LC in a cell glued directly onto VCSEL package. Before filling in the LC, the VCSEL emits linearly polarized light and this linear polarization is lost after LC filling. The output intensity as a function of polarizer angle shows partial planar alignment of the E7 LC, which is very important for the further advancement of the LC-VCSEL integrated system.

Paper Details

Date Published: 15 May 2012
PDF: 6 pages
Proc. SPIE 8432, Semiconductor Lasers and Laser Dynamics V, 84321X (15 May 2012); doi: 10.1117/12.922238
Show Author Affiliations
Veena M. Nair, Vrije Univ. Brussel (Belgium)
Krassimir Panajotov, Vrije Univ. Brussel (Belgium)
Institute of Solid State Physics (Bulgaria)
Mikov Petrov, Institute of Solid State Physics (Bulgaria)
Hugo Thienpont, Vrije Univ. Brussel (Belgium)
Yi Xie, Ghent Univ. (Belgium)
Jeroen Beeckman, Ghent Univ. (Belgium)
Kristiaan Neyts, Ghent Univ. (Belgium)

Published in SPIE Proceedings Vol. 8432:
Semiconductor Lasers and Laser Dynamics V
Krassimir Panajotov; Marc Sciamanna; Angel Valle; Rainer Michalzik, Editor(s)

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