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Proceedings Paper

Interferometric gauge block measurement with 633-nm He-Ne and 1,064-nm Nd:YAG lasers
Author(s): Hideaki Yoshimori; Katuo Seta; Yong-Chol Lee; Satoshi Hatano; Hirokazu Matsumoto
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Paper Abstract

We have developed a laser interferometer to calibrate gauge block utilizing 2 lasers, 633 nm He-Ne and 1,064 nm Nd:YAG. At only 633 nm of wavelength, several kinds of practical He- Ne lasers have been developed and manufactured, while there is not practical laser light source for interferometer other than at 633 nm. To realize practical light source in addition to 633 nm, we stabilized the wavelength of 1,064 nm Nd:YAG laser, utilizing linear absorption of iodine at 532 nm. The iodine cell was inserted between two non linear crystals for second harmonic generation and first derivative signal was generated by dispersion effect near the absorption line of iodine, without electric circuit for modulation or for phase sensitive detection. Gauge blocks were measured with the two wavelengths of 633 and 1,064 nm. The fringe pattern was detected by CCD camera and the length was estimated by excess fraction method. It is easy to determine the integer part of the fringe order, since the wavelength difference between these two is large and the wavelength ratio is not expressed by a simple combination on integers. The results agreed with those obtained by conventional method with 198Hg isotope lamp.

Paper Details

Date Published: 30 September 1998
PDF: 7 pages
Proc. SPIE 3477, Recent Developments in Optical Gauge Block Metrology, (30 September 1998); doi: 10.1117/12.323102
Show Author Affiliations
Hideaki Yoshimori, National Research Lab. of Metrology (Japan)
Katuo Seta, National Research Lab. of Metrology (Japan)
Yong-Chol Lee, NEO ARK Corp. (Japan)
Satoshi Hatano, NEO ARK Corp. (Japan)
Hirokazu Matsumoto, National Research Lab. of Metrology (Japan)

Published in SPIE Proceedings Vol. 3477:
Recent Developments in Optical Gauge Block Metrology
Jennifer E. Decker; Nicholas Brown, Editor(s)

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