VCSEL mode-transforming phase filter with enhanced performance

Details VCSEL mode-transforming phase filter with enhanced performance VCSEL mode-transforming phase filter with enhanced performance

2006-06-13

2006-06-13

Menefee, James (Department: 2828)

Coherent light generators

Particular beam control device

Mode discrimination

C372S050100

Reexamination Certificate

active

07061945

ABSTRACT:
A vertical cavity surface emitting laser (VCSEL) in which a higher order lasing mode produces a Gaussian-like single mode far field beam intensity pattern. Such a VCSEL includes a protective surface deposition on a VCSEL structure, and phase filter elements on the surface deposition. The surface deposition and the phase filter elements implement an optical phase filter that induces optical path difference such that a single mode far field beam intensity pattern results when the VCSEL operates in a higher order lasing mode. The VCSEL can include structures that enhance a selected higher-order operating mode and/or that suppress unwanted operating modes.

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Satoshi Shinada et al., “Single High-Order Transverse Mode Surface Emitting Laser with Micromachined Surface Relief,” IEICE Trans. Electron., vol. E85-C, No. 4, Apr. 2002, pp. 995-1000.
Shinada, S., et al., “Far field pattern control of single high order transverse mode VCSEL with micromachined surface relief”, article from presentation at LEOS conference, Nov. 2001, pp. 564-565.

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