Free-surface effects on the response of nematic liquid crystal films to a laser pulse |
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| Authors: | Ru-Pin Pan Shyu-Mou Chen Hung-Yu Yang |
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| Affiliation: | 1. Department of Electrophysics , National Chiao-Tung University , Hsinchu, Taiwan , 300 , Republic of China;2. Institute of Electro-Optical Engineering, National Chiao-Tung University , Hsinchu, Taiwan , 300 , Republic of China |
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| Abstract: | ![]()
Abstract The dynamic response of 5CB films with a free surface to a laser pulse is investigated. A magnetic field above the Fréedericksz transition is applied initially to induce a starting angle on the molecular orientation. A single 1·06 μm laser pulse with e ?1 pulse width 0·2 ms is incident normally upon the films. When the laser pulse polarization is perpendicular to the magnetic field, only a thermal effect is involved. While it is parallel to the magnetic field, both molecular orientation and thermal effects are involved. The results from films with a free surface are compared with those from films sandwiched between two glass substrates. The free surface effect, beam size effect, and thermal effect are discussed by comparing with theoretical analysis. |
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