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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 53, Iss. 13 — May. 1, 2014
  • pp: 2793–2801

Prism-pair interferometer for precise measurement of the refractive index of optical glass by using a spectrum lamp

Yasuaki Hori, Akiko Hirai, and Kaoru Minoshima  »View Author Affiliations

Applied Optics, Vol. 53, Issue 13, pp. 2793-2801 (2014)

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A prism-pair interferometer for a spectrum lamp was developed for precise measurement of the refractive index of a prism of optical glass. Previously we reported the prism-pair interferometer with a He–Ne laser light source, resulting in a measurement uncertainty of 1.1×106. However, most of the refractive-index values managed by optical glass manufacturers are conventionally measured with spectrum lamps. We have optimized the prism-pair interferometer for spectrum lamps and implemented a signal-processing technique from Fourier-transform spectroscopy. When the refractive index is measured, the wavelength of the spectrum lamp is simultaneously calibrated by part of the interferometer, so that the resulting refractive index is traceable to a national standard of length. The combined standard uncertainty for a refractive index measured with the e-line (546 nm) of a Hg lamp is 6.9×106.

© 2014 Optical Society of America

OCIS Codes
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.3930) Instrumentation, measurement, and metrology : Metrological instrumentation
(120.4530) Instrumentation, measurement, and metrology : Optical constants
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(160.2750) Materials : Glass and other amorphous materials
(160.4760) Materials : Optical properties

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: January 22, 2014
Revised Manuscript: March 25, 2014
Manuscript Accepted: March 27, 2014
Published: April 24, 2014

Yasuaki Hori, Akiko Hirai, and Kaoru Minoshima, "Prism-pair interferometer for precise measurement of the refractive index of optical glass by using a spectrum lamp," Appl. Opt. 53, 2793-2801 (2014)

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