Dynamics of picosecond laser-induced density, temperature, and flow-reorientation effects in the mesophases of liquid crystals

Iam-choon Khoo, R. G. Lindquist, R. R. Michael, R. J. Mansfield, P. LoPresti

Research output: Contribution to journalArticle

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Abstract

A detailed theoretical and experimental study of laser-induced density and temperature changes, and flow-reorientation effects in the nematic and smectic phases of liquid crystals is presented. Using picosecond lasers, the initial nanosecond dynamics of the photoinduced density waves, temperature buildup, and relaxations are temporally resolved. The experimentally observed relaxation phenomena and time scales are in good agreement with the theoretical expressions obtained by analytical solutions of the coupled hydrodynamical equations describing these fundamental mechanisms. Our new measurement and theory provide a quantitative account of the relative contribution from the electrostrictive and thermoelastic contributions that had not been presented in previous studies. Our study of the smectic phase has conclusively established the mechanism for the formation of erasable and permanent grating effects under short-laser-pulse excitation as laser-induced electrostrictive and thermoelastic effects.

Original languageEnglish (US)
Pages (from-to)3853-3859
Number of pages7
JournalJournal of Applied Physics
Volume69
Issue number7
DOIs
StatePublished - Dec 1 1991

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retraining
liquid crystals
lasers
temperature
gratings
pulses
excitation

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Khoo, Iam-choon ; Lindquist, R. G. ; Michael, R. R. ; Mansfield, R. J. ; LoPresti, P. / Dynamics of picosecond laser-induced density, temperature, and flow-reorientation effects in the mesophases of liquid crystals. In: Journal of Applied Physics. 1991 ; Vol. 69, No. 7. pp. 3853-3859.
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Dynamics of picosecond laser-induced density, temperature, and flow-reorientation effects in the mesophases of liquid crystals. / Khoo, Iam-choon; Lindquist, R. G.; Michael, R. R.; Mansfield, R. J.; LoPresti, P.

In: Journal of Applied Physics, Vol. 69, No. 7, 01.12.1991, p. 3853-3859.

Research output: Contribution to journalArticle

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AU - Khoo, Iam-choon

AU - Lindquist, R. G.

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AU - Mansfield, R. J.

AU - LoPresti, P.

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