Interferometer using vertical-cavity surface-emitting lasers

US20070263204A1Inactive Publication Date: 2007-11-15KYUNGPOOK NAT UNIV IND ACADEMIC COOP FOUND
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
KYUNGPOOK NAT UNIV IND ACADEMIC COOP FOUND
Publication Date
2007-11-15
Estimated Expiration
Not applicable · inactive patent

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Abstract

An interferometer which incorporates a single mode VCSEL to facilitate miniaturization through integration of parts. The interferometer includes a beam splitter for partially reflecting and transmitting light; a single mode vertical-cavity surface-emitting laser for generating a beam of light perpendicular to a wafer; a first mirror fixedly perpendicular to the first path to reflect the portion of light reflected from the beam splitter; a second mirror movably arranged along the second path to reflect the beam portion transmitted through the beam splitter. A photodetector arranged along the second path detects the beam portion reflected from the first mirror and transmitted again through the beam splitter and the beam portion reflected from the second mirror and reflected again from the beam splitter to locate the second mirror based on an interference fringe created by a difference in the paths between the two beam portions.
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Description

CROSS REFERENCE TO RELATED APPLICATION

[0001] This application claims the benefit of Korean Patent Application No. 2006-0043198 filed on May 15, 2006, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference.BACKGROUND OF THE INVENTION

[0002] 1. Field of the Invention

[0003] The present invention relates to an interferometer using a vertical-cavity surface-emitting laser (VCSEL), and more particularly, to an interferometer which incorporates a single mode VCSEL to facilitate miniaturization through integration of parts, save manufacturing cost, and improve precision.

[0004] 2. Description of the Related Art

[0005] An interferometer is an optical device utilizing superposition of wave which has a long history. Before the invention of the laser, pseudo-monochromatic light had been produced by transmitting light from a mercury lamp or natural light through a filter in order to create an interference fringe. After the introduction of the laser, the i...

Claims

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