Calibration of photoelastic modulators in the vacuum UV

Theodore C. Oakberg, John Trunk, John C. Sutherland

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Measurements of circular dichroism (CD) in the UV and vacuum UV have used photoelastic modulators (PEMs) for high sensitivity (to about 10-6). 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 but 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.

Original languageEnglish (US)
Pages (from-to)101-111
Number of pages11
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume4133
Issue number1
DOIs
StatePublished - Nov 15 2000

Fingerprint

Modulator
Modulators
modulators
Vacuum
Calibration
vacuum
Calcium Fluoride
Calcium fluoride
calcium fluorides
Calcium
lithium fluorides
Dichroism
Light sources
Curve
dichroism
light sources
Lithium
curves
Wavelength
Optical devices

Keywords

  • Chiral molecule
  • Circular dichroism
  • Photoelastic modulator
  • Synchrotron
  • UV
  • Vacuum UV

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

Calibration of photoelastic modulators in the vacuum UV. / Oakberg, Theodore C.; Trunk, John; Sutherland, John C.

In: Proceedings of SPIE - The International Society for Optical Engineering, Vol. 4133, No. 1, 15.11.2000, p. 101-111.

Research output: Contribution to journalArticle

@article{7069a2eef1414b4fb41b0be292955de0,
title = "Calibration of photoelastic modulators in the vacuum UV",
abstract = "Measurements of circular dichroism (CD) in the UV and vacuum UV have used photoelastic modulators (PEMs) for high sensitivity (to about 10-6). 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 but 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.",
keywords = "Chiral molecule, Circular dichroism, Photoelastic modulator, Synchrotron, UV, Vacuum UV",
author = "Oakberg, {Theodore C.} and John Trunk and Sutherland, {John C.}",
year = "2000",
month = "11",
day = "15",
doi = "10.1117/12.406617",
language = "English (US)",
volume = "4133",
pages = "101--111",
journal = "Proceedings of SPIE - The International Society for Optical Engineering",
issn = "0277-786X",
publisher = "SPIE",
number = "1",

}

TY - JOUR

T1 - Calibration of photoelastic modulators in the vacuum UV

AU - Oakberg, Theodore C.

AU - Trunk, John

AU - Sutherland, John C.

PY - 2000/11/15

Y1 - 2000/11/15

N2 - Measurements of circular dichroism (CD) in the UV and vacuum UV have used photoelastic modulators (PEMs) for high sensitivity (to about 10-6). 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 but 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.

AB - Measurements of circular dichroism (CD) in the UV and vacuum UV have used photoelastic modulators (PEMs) for high sensitivity (to about 10-6). 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 but 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.

KW - Chiral molecule

KW - Circular dichroism

KW - Photoelastic modulator

KW - Synchrotron

KW - UV

KW - Vacuum UV

UR - http://www.scopus.com/inward/record.url?scp=0034499794&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0034499794&partnerID=8YFLogxK

U2 - 10.1117/12.406617

DO - 10.1117/12.406617

M3 - Article

AN - SCOPUS:0034499794

VL - 4133

SP - 101

EP - 111

JO - Proceedings of SPIE - The International Society for Optical Engineering

JF - Proceedings of SPIE - The International Society for Optical Engineering

SN - 0277-786X

IS - 1

ER -