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Optics Letters

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  • Vol. 13, Iss. 7 — Jul. 1, 1988
  • pp: 574–576

Interferometric measurements of femtosecond group delay in optical components

Wayne H. Knox, Nathaniel M. Pearson, Kathryn D. Li, and Charles A. Hirlimann  »View Author Affiliations


Optics Letters, Vol. 13, Issue 7, pp. 574-576 (1988)
http://dx.doi.org/10.1364/OL.13.000574


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Abstract

We report direct measurements of the frequency dependence of the optical group delay for a number of optical components commonly used in femtosecond optics. We have investigated the group-delay errors that occur on reflection from metal and dielectric mirrors under various conditions and passage through devices that introduce angular dispersion. We obtain measurement accuracy of about ±1 fsec over the spectral range of 400–750 nm.

© 1988 Optical Society of America

History
Original Manuscript: February 19, 1988
Manuscript Accepted: April 7, 1988
Published: July 1, 1988

Citation
Wayne H. Knox, Nathaniel M. Pearson, Kathryn D. Li, and Charles A. Hirlimann, "Interferometric measurements of femtosecond group delay in optical components," Opt. Lett. 13, 574-576 (1988)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-13-7-574


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References

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  9. We find the center of the fringe pattern in a noise-insensitive manner by subtracting the dc value, squaring the result, and integrating. The 50% rise point represents the center of the packet. To compensate for long-term drift in the translation stage over the approximately 30-min interval of a complete scan, we return the tunable filter to the same reference wavelength after each new wavelength scan and check that the time center of the fringe pattern is unchanged. Small systematic errors are effectively canceled in this way. In addition, a He–Be reference interferometer beam is simultaneously read for accurate on-line length calibrations.
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  11. F. A. Jenkins, H. E. White, Fundamentals of Optics (McGraw-Hill, New York, 1957), p. 536.
  12. For measurements of extremely small group-delay errors, we use a multiple-bounce arrangement wherein the beam passes through two identical mirrors that are parallel. For the measurements in Fig. 1, a total of 12 reflections is used. We then plot the measured group delay divided by 12 to obtain the single-bounce contribution. The measurement accuracy is then a few femtoseconds divided by 12, or a few hundred attoseconds.
  13. A. M. Weiner, J. G. Fujimoto, E. P. Ippen, Opt. Lett. 10, 71 (1985). [CrossRef] [PubMed]
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  18. The use of prisms to cancel grating errors was first suggested by J. D. Kafka, Spectra-Physics, 1250 West Middlefield Road, Mountain View, California 94042 (personal communication).

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