Tunable laser sources for absolute optical interferometry

Umberto Minoni; Enea Gelmini; Franco Docchio; Umberto U. Perini

doi:10.1117/12.198677

4 January 1995 Tunable laser sources for absolute optical interferometry

Umberto Minoni, Enea Gelmini, Franco Docchio, Umberto U. Perini

Proceedings Volume 2349, Industrial Optical Sensors for Metrology and Inspection; (1995) https://doi.org/10.1117/12.198677
Event: Photonics for Industrial Applications, 1994, Boston, MA, United States

Abstract

Absolute interferometry is based on the use of an optical synthetic wavelength generated by two beating lasers. To obtain high-resolution, absolute measurements over a wide range it is necessary to use multiple synthetic wavelengths. A tunable synthetic wavelength generator would be the ideal solution for this purpose. In this paper, two configurations based on the use of two diode lasers and two diode-pumped Nd:YAG lasers are discussed. The paper presents the optical set-up for the generation of the synthetic wavelength, the necessary frequency-locking electronics, and experimental results from two prototypes.

Citation Download Citation

Umberto Minoni, Enea Gelmini, Franco Docchio, and Umberto U. Perini "Tunable laser sources for absolute optical interferometry", Proc. SPIE 2349, Industrial Optical Sensors for Metrology and Inspection, (4 January 1995); https://doi.org/10.1117/12.198677

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