NDLI: Heterodyne Interferometers Using Orthogonally Polarized and Two-Frequency Shifted Light Sources with Super-high Extinction Ratio

Content Provider	Springer Nature Link
Author	Nakatani, boru
Copyright Year	1999
Abstract	This paper describes heterodyne interferometers using orthogonally polarized and two-frequency shifted light sources of two types with super-high extinction ratio to reduce non-linearity of the interferometer due to polarization cross-talk. The acousto-optic modulators are used to shift light frequency. In the first interferometer the light source with Glan-Thomson prisms of very high extinction ratio (50 dB) is used to make the polarization cross-talk very small. In the second interferometer the light source of two-frequency shifted beams with small crossing angle (2.5 rnrad-10 mrad) is used to completely exclude non-linearity of the interferometer due to polarization cross-talk. By measuring the thickness of vacuum evaporation film, it was demonstrated that the interferometers are useful to measure thickness of a thin film in nanometer order.
Starting Page	443
Ending Page	448
Page Count	6
File Format	PDF
ISSN	13406000
Journal	Optical Review
Volume Number	6
Issue Number	5
e-ISSN	13499432
Language	English
Publisher	Springer-Verlag
Publisher Date	1999-01-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	heterodyne interferometer frequency shifted light source high extinction ratio non-linearity polarization cross-talk Electromagnetism, Optics and Lasers
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics

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Heterodyne Interferometers Using Orthogonally Polarized and Two-Frequency Shifted Light Sources with Super-high Extinction Ratio