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Proceedings Paper

Periodic error characterization in commercial heterodyne interferometer using an external cavity diode laser based Fabry-Perot interferometer
Author(s): Minhao Zhu; Haoyun Wei; Yan Li
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Paper Abstract

Periodic error is a main error source that limits the measurement accuracy in heterodyne laser interferometry. An external cavity diode laser (ECDL) based Fabry-Perot (F-P) interferometer referenced to an optical frequency comb (OFC) is proposed to characterize the periodic error in heterodyne interferometers. The Pound-Drever-Hall locking technique is employed to lock the tracking ECDL frequency to the resonance of a high finesse F-P cavity. The frequency of a reference ECDL is locked to a selected mode of an OFC to generate a stable single optical frequency. The frequency change of the tracking ECDL induced by the cavity displacement is measured by beating with the reference ECDL locked to the OFC. Experiments show that the F-P interferometer system has a displacement resolution of 1.96 pm. We compared the measurement results of our system with a commercial plane mirror heterodyne interferometer. The period if the periodic error is about half wavelength, with an error amplitude of 4.8 nm.

Paper Details

Date Published: 18 August 2014
PDF: 7 pages
Proc. SPIE 9203, Interferometry XVII: Techniques and Analysis, 92031A (18 August 2014); doi: 10.1117/12.2067737
Show Author Affiliations
Minhao Zhu, Tsinghua Univ. (China)
Haoyun Wei, Tsinghua Univ. (China)
Yan Li, Tsinghua Univ. (China)


Published in SPIE Proceedings Vol. 9203:
Interferometry XVII: Techniques and Analysis
Katherine Creath; Jan Burke; Joanna Schmit, Editor(s)

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