Computational approach to homodyne detection of interference phase

Šimon Řeřucha; Zdeněk Buchta; Martin Šarbort; Josef Lazar; Ondřej Číp

doi:10.1117/12.2010514

18 December 2012 Computational approach to homodyne detection of interference phase

Šimon Řeřucha, Zdeněk Buchta, Martin Šarbort, Josef Lazar, Ondřej Číp

Proceedings Volume 8697, 18th Czech-Polish-Slovak Optical Conference on Wave and Quantum Aspects of Contemporary Optics; 869707 (2012) https://doi.org/10.1117/12.2010514
Event: 18th Czech-Polish-Slovak Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 2012, Ostravice, Czech Republic

Abstract

Determination of the interference phase, i.e. the mutual phase shift between interfering waves is a principal issue in the interferometric measurement, especially on the nanometre scale. Our goal was to develop a novel interference phase detection technique that employs a computational approach and a frequency modulation of the laser source to achieve comparable performance with a homodyne detection with an optical phase shift generation. We have used a Michelson setup with polarizing optics that allowed to compare both the homodyne detection method and our novel method side by side while both methods shared the optical setup. Our method also comprises error compensation that deals e.g. with residual amplitude modulation and the scale non-linearities. The experiments revealed that the novel method achieves a periodic error less than 0.16 angular degrees and a standard deviation of less than 1.5 degrees, compared against the reference. The operational distance was 600mm. The method had proven it is suitable replacement for traditional homodyne detection techniques since it has comparable performance and significantly lower demands on the optical setup.

Citation Download Citation

Šimon Řeřucha, Zdeněk Buchta, Martin Šarbort, Josef Lazar, and Ondřej Číp "Computational approach to homodyne detection of interference phase", Proc. SPIE 8697, 18th Czech-Polish-Slovak Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 869707 (18 December 2012); https://doi.org/10.1117/12.2010514

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KEYWORDS

Modulation

Homodyne detection

Phase shifts

Signal detection

Interferometers

Phase shift keying

Laser sources

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