Browsing by Author "YANG, HY"

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FREE-SURFACE EFFECTS ON THE RESPONSE OF NEMATIC LIQUID-CRYSTAL FILMS TO A LASER-PULSE
(1993-05-01)
PAN, RP
;
CHEN, SM
;
YANG, HY
;
電子物理學系
;
光電工程學系
The dynamic response of 5CB films with a free surface to a laser pulse is investigated. A magnetic field above the Freedericksz transition is applied initially to induce a starting angle on the molecular orientation. A single 1.06 mum 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.