CALIBRATION OF PHOTOELASTIC MODULATORS IN THE VACUUM UV.

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Description

Measurements of circular dichroism (CD) in the UV and vacuum UV have used photoelastic modulators (PEMs) for high sensitivity (to about 10{sup -6}). While a simple technique for wavelength calibration of the PEMs has been used with good results, several features of these calibration curves have not been understood. The authors have calibrated a calcium fluoride PEM and a lithium fluoride PEM using the National Synchrotron Light Source (NSLS) at Brookhaven National Laboratory as a light source. These experiments showed calibration graphs that are linear bit do not pass through the graph origin. A second ''multiple pass'' experiment with laser ... continued below

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12 pages

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Oakberg, T. C.; Trunk, J. & Sutherland, J. C. February 15, 2000.

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Description

Measurements of circular dichroism (CD) in the UV and vacuum UV have used photoelastic modulators (PEMs) for high sensitivity (to about 10{sup -6}). While a simple technique for wavelength calibration of the PEMs has been used with good results, several features of these calibration curves have not been understood. The authors have calibrated a calcium fluoride PEM and a lithium fluoride PEM using the National Synchrotron Light Source (NSLS) at Brookhaven National Laboratory as a light source. These experiments showed calibration graphs that are linear bit do not pass through the graph origin. A second ''multiple pass'' experiment with laser light of a single wavelength, performed on the calcium fluoride PEM, demonstrates the linearity of the PEM electronics. This implies that the calibration behavior results from intrinsic physical properties of the PEM optical element material. An algorithm for generating calibration curves for calcium fluoride and lithium fluoride PEMs has been developed. The calibration curves for circular dichroism measurement for the two PEMs investigated in this study are given as examples.

Physical Description

12 pages

Notes

INIS; Refer requests to OSTI; OSTI as DE00785052

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  • Other Information: POLARIZATION ANALYSIS, MEASUREMENT, AND REMOTE SENSING III, SPIE 4133, PP.101-114, 2000

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  • Report No.: BNL--68548
  • Report No.: KP1101010
  • Grant Number: AC02-98CH10886
  • Office of Scientific & Technical Information Report Number: 785052
  • Archival Resource Key: ark:/67531/metadc718644

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • February 15, 2000

Added to The UNT Digital Library

  • Sept. 29, 2015, 5:31 a.m.

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  • Nov. 9, 2015, 8:22 p.m.

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Oakberg, T. C.; Trunk, J. & Sutherland, J. C. CALIBRATION OF PHOTOELASTIC MODULATORS IN THE VACUUM UV., book, February 15, 2000; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc718644/: accessed November 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.