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Optical Engineering

Angle measurement by injection-detection in a laser diode
Author(s): Guido Giuliani; Silvano Donati; Marco Passerini; Thierry M. Bosch
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Paper Abstract

We propose a new technique to measure the angle of a remote flat surface with respect to the propagation direction of a laser beam, based on injection detection in a laser diode. The surface under test acts as the remote mirror of an external cavity laser, and causes the laser diode to operate in the coherent collapse regime. The power emitted by the laser depends on the alignment of the remote surface, and an ac technique enables us to measure angle with a sensitivity of 0.1 arcsec (i.e., 5 x 10-7 rad). The attained performances are comparable to those of existing autocollimators, with the advantage of simplicity and compactness that makes the new technique interesting for the development of a measuring instrument.

Paper Details

Date Published: 1 January 2001
PDF: 5 pages
Opt. Eng. 40(1) doi: 10.1117/1.1332276
Published in: Optical Engineering Volume 40, Issue 1
Show Author Affiliations
Guido Giuliani, Univ. di Pavia (Italy)
Silvano Donati, Univ. di Pavia (Italy)
Marco Passerini, Univ di Pavia (Italy)
Thierry M. Bosch, Ecole des Mines de Nantes (France)


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