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Applied Optics

Applied Optics


  • Vol. 13, Iss. 6 — Jun. 1, 1974
  • pp: 1435–1437

Range Independence of Signal in Variable Focus Remote Raman Spectrometry

T. Hirschfeld  »View Author Affiliations

Applied Optics, Vol. 13, Issue 6, pp. 1435-1437 (1974)

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Sensitivity often restricts remote Raman spectrometers to operate at ranges inside their very large hyperfocal distances. Operation against a daylit background then requires minimizing the system etendue. This can be done by focusing the system at the range of interest; the depth of field is then etendue limited and varies with the square of the range. For the usual case of depth of field limited sampling depth, this cancels the inverse square range effect on signal strength, making the signal range independent (if atmospheric absorption is neglected). This concept is proven analytically and experimentally.

© 1974 Optical Society of America

Original Manuscript: April 19, 1973
Published: June 1, 1974

T. Hirschfeld, "Range Independence of Signal in Variable Focus Remote Raman Spectrometry," Appl. Opt. 13, 1435-1437 (1974)

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  1. T. Hirschfeld, E. R. Schildkraut, H. Tannenbaum, D. Tanenbaum, Appl. Phys. Lett. 22, 38 (1973). [CrossRef]
  2. T. Hirschfeld, S. Klainer, R. Burton, in Proc. Electrooptical Systems Design Symp., K. A. Kopetsky, Ed. (Industrial and Scientific Conference Management, Chicago, Ill., 1970), p. 418–27.
  3. P. Jacquinot, J. Opt. Soc. Am. 44, 761 (1954). [CrossRef]
  4. Z. Zachor, “Throughput—A Figure of Merit for Optical Systems,” Advertisement, J. Opt. Soc. Am. 54, No. 1 (1964).

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