Papers

Peer-reviewed
Aug, 2015

Phase-shifting interferometer with pulse modulation based on a downsampling technique

OPTICAL ENGINEERING
  • Takuma Serizawa
  • ,
  • Takamasa Suzuki
  • ,
  • Samuel Choi

Volume
54
Number
8
First page
085107_1
Last page
085107_4
Language
English
Publishing type
Research paper (scientific journal)
DOI
10.1117/1.OE.54.8.085107
Publisher
SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS

A phase-shifting interferometer that uses pulse modulation and downsampling is proposed and demonstrated. Pulse modulation is a direct modulating technique that realizes a rapid, large change in the wavelength of a laser diode with a constant optical power. For instance, an interference signal of 10 kHz is observed after the injection of pulse current. However, an expensive high-speed charge coupled device (CCD) camera is required to acquire a high-speed interference signal. If we consider a periodical signal, the same waveform repeats at every period. Therefore, the signal varying with high frequency can be captured by a low-frequency sampling pulse. This signal processing technique, the so-called downsampling, enables us to acquire rapid interference signals with a standard CCD camera. The experimental results using a flat mirror and a concave mirror showed measurement errors of 10 and 28 nm in root mean square (RMS), respectively. The repeatability of the experimental result between the first and the second is 13 nm in RMS. (C) 2015 Society of Photo-Optical Instrumentation Engineers (SPIE)

Link information
DOI
https://doi.org/10.1117/1.OE.54.8.085107
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000362507000033&DestApp=WOS_CPL
ID information
  • DOI : 10.1117/1.OE.54.8.085107
  • ISSN : 0091-3286
  • eISSN : 1560-2303
  • Web of Science ID : WOS:000362507000033

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