Novel interferometric technique for measuring thermal diffusivity of nonlinear anisotropic crystals.

R. A. Morgan, K. I. Kang, C. C. Hsu, Nasser N Peyghambarian

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

It has been demonstrated that an all-optical interferometer can be used to measure directly the thermal diffusivity of nonlinear materials by measuring optical path differences only. A lithium niobate crystal was inserted into an interferometer and heated by its absorption of an input pulse from a focused CO2 laser. As the heat diffuses outward in the crystal, the refractive index increases and the crystal expands. The resulting optical path change can be monitored interferometrically in real time, and from fringe data the thermal diffusivity is determined. A Gaussian model for the temperature distribution was derived and verified empirically. The method is quite general and should work for a variety of materials given the proper laser probe and (heat) pump wavelengths. It avoids the need to measure temperature distributions, powers, and critical crystal parameters, dimensions, and angles.

Original languageEnglish (US)
Title of host publicationCLEO 88 Conf Lasers Electro Opt 1988 Tech Dig Ser Vol 7
PublisherPubl by IEEE
ISBN (Print)155752033X
StatePublished - 1988

Fingerprint

Thermal diffusivity
Crystals
Interferometers
Temperature distribution
Lasers
Laser pulses
Refractive index
Lithium
Pumps
Wavelength
Hot Temperature

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Morgan, R. A., Kang, K. I., Hsu, C. C., & Peyghambarian, N. N. (1988). Novel interferometric technique for measuring thermal diffusivity of nonlinear anisotropic crystals. In CLEO 88 Conf Lasers Electro Opt 1988 Tech Dig Ser Vol 7 Publ by IEEE.

Novel interferometric technique for measuring thermal diffusivity of nonlinear anisotropic crystals. / Morgan, R. A.; Kang, K. I.; Hsu, C. C.; Peyghambarian, Nasser N.

CLEO 88 Conf Lasers Electro Opt 1988 Tech Dig Ser Vol 7. Publ by IEEE, 1988.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Morgan, RA, Kang, KI, Hsu, CC & Peyghambarian, NN 1988, Novel interferometric technique for measuring thermal diffusivity of nonlinear anisotropic crystals. in CLEO 88 Conf Lasers Electro Opt 1988 Tech Dig Ser Vol 7. Publ by IEEE.
Morgan RA, Kang KI, Hsu CC, Peyghambarian NN. Novel interferometric technique for measuring thermal diffusivity of nonlinear anisotropic crystals. In CLEO 88 Conf Lasers Electro Opt 1988 Tech Dig Ser Vol 7. Publ by IEEE. 1988
Morgan, R. A. ; Kang, K. I. ; Hsu, C. C. ; Peyghambarian, Nasser N. / Novel interferometric technique for measuring thermal diffusivity of nonlinear anisotropic crystals. CLEO 88 Conf Lasers Electro Opt 1988 Tech Dig Ser Vol 7. Publ by IEEE, 1988.
@inproceedings{dfe131632032417ba589db4e9e277609,
title = "Novel interferometric technique for measuring thermal diffusivity of nonlinear anisotropic crystals.",
abstract = "It has been demonstrated that an all-optical interferometer can be used to measure directly the thermal diffusivity of nonlinear materials by measuring optical path differences only. A lithium niobate crystal was inserted into an interferometer and heated by its absorption of an input pulse from a focused CO2 laser. As the heat diffuses outward in the crystal, the refractive index increases and the crystal expands. The resulting optical path change can be monitored interferometrically in real time, and from fringe data the thermal diffusivity is determined. A Gaussian model for the temperature distribution was derived and verified empirically. The method is quite general and should work for a variety of materials given the proper laser probe and (heat) pump wavelengths. It avoids the need to measure temperature distributions, powers, and critical crystal parameters, dimensions, and angles.",
author = "Morgan, {R. A.} and Kang, {K. I.} and Hsu, {C. C.} and Peyghambarian, {Nasser N}",
year = "1988",
language = "English (US)",
isbn = "155752033X",
booktitle = "CLEO 88 Conf Lasers Electro Opt 1988 Tech Dig Ser Vol 7",
publisher = "Publ by IEEE",

}

TY - GEN

T1 - Novel interferometric technique for measuring thermal diffusivity of nonlinear anisotropic crystals.

AU - Morgan, R. A.

AU - Kang, K. I.

AU - Hsu, C. C.

AU - Peyghambarian, Nasser N

PY - 1988

Y1 - 1988

N2 - It has been demonstrated that an all-optical interferometer can be used to measure directly the thermal diffusivity of nonlinear materials by measuring optical path differences only. A lithium niobate crystal was inserted into an interferometer and heated by its absorption of an input pulse from a focused CO2 laser. As the heat diffuses outward in the crystal, the refractive index increases and the crystal expands. The resulting optical path change can be monitored interferometrically in real time, and from fringe data the thermal diffusivity is determined. A Gaussian model for the temperature distribution was derived and verified empirically. The method is quite general and should work for a variety of materials given the proper laser probe and (heat) pump wavelengths. It avoids the need to measure temperature distributions, powers, and critical crystal parameters, dimensions, and angles.

AB - It has been demonstrated that an all-optical interferometer can be used to measure directly the thermal diffusivity of nonlinear materials by measuring optical path differences only. A lithium niobate crystal was inserted into an interferometer and heated by its absorption of an input pulse from a focused CO2 laser. As the heat diffuses outward in the crystal, the refractive index increases and the crystal expands. The resulting optical path change can be monitored interferometrically in real time, and from fringe data the thermal diffusivity is determined. A Gaussian model for the temperature distribution was derived and verified empirically. The method is quite general and should work for a variety of materials given the proper laser probe and (heat) pump wavelengths. It avoids the need to measure temperature distributions, powers, and critical crystal parameters, dimensions, and angles.

UR - http://www.scopus.com/inward/record.url?scp=0024131949&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0024131949&partnerID=8YFLogxK

M3 - Conference contribution

SN - 155752033X

BT - CLEO 88 Conf Lasers Electro Opt 1988 Tech Dig Ser Vol 7

PB - Publ by IEEE

ER -