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Proceedings Paper

High-sensitivity scatterometer with a bidirectional ring laser
Author(s): Rafael Quintero-Torres; M. Navarro; Mark R. Ackermann; Jean-Claude Diels
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Paper Abstract

We present a technique for the absolute measurement of very low-level scattering. The method is absolute in that it relies on fundamental physics and does not require calibration against standards maintained by the National Institute of Standards. In a bi-directional mode-locked ring laser, a difference in longitudinal mode frequency between the two senses of circulation of the intracavity pulses can be measured as a beat note between the corresponding outputs. A very small amount of light backscattered by a sample (located at the pulse crossing) from one sense of circulation into the other, causes the beat note to vanish. The threshold in mode frequency difference that causes locking is a measure of the scattering amplitude.

Paper Details

Date Published: 25 June 2003
PDF: 5 pages
Proc. SPIE 4969, Laser Resonators and Beam Control VI, (25 June 2003); doi: 10.1117/12.502747
Show Author Affiliations
Rafael Quintero-Torres, Univ. of New Mexico (United States)
M. Navarro, Univ. of New Mexico (United States)
Mark R. Ackermann, Univ. of New Mexico (United States)
Jean-Claude Diels, Univ. of New Mexico (United States)

Published in SPIE Proceedings Vol. 4969:
Laser Resonators and Beam Control VI
Alexis V. Kudryashov; Alan H. Paxton, Editor(s)

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