Transmission laser microscope using the phase-shifting technique and its application to measurement of optical waveguides

Transmission laser microscope using the phase-shifting technique and its application to measurement of optical waveguides

A type of a transmission phase-shifting laser microscope, believed to be new, has been developed. In this microscope a biprism located between a magnifying lens and an observation plane was used as a beam splitter. The biprism is laterally translated to introduce phase shifts required for quantitati...

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Veröffentlicht in:Applied Optics 2002-03, Vol.41 (7), p.1308-1314
Hauptverfasser: Endo, Junji, Chen, Jun, Kobayashi, Dai, Wada, Yasuo, Fujita, Hiroyuki
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container_end_page 1314
container_issue 7
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container_title Applied Optics
container_volume 41
creator Endo, Junji
Chen, Jun
Kobayashi, Dai
Wada, Yasuo
Fujita, Hiroyuki
description A type of a transmission phase-shifting laser microscope, believed to be new, has been developed. In this microscope a biprism located between a magnifying lens and an observation plane was used as a beam splitter. The biprism is laterally translated to introduce phase shifts required for quantitative phase measurement with a phase-shifting technique. The disturbance caused by a Fresnel-diffracted wave from the splitting edge of the biprism is reduced by placement of a linear beam stopper at the center of an intermediate image plane. As the first application, the developed microscope is used to measure a refractive-index distribution in optical waveguides. A difference of refractive indices of less than 6 x 10(-5) is clearly measured in the submicrometer region.
doi_str_mv 10.1364/ao.41.001308
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title Transmission laser microscope using the phase-shifting technique and its application to measurement of optical waveguides
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