Portal de Periódicos da CAPES

<title>Optical limiting with liquid-crystal materials</title>

1992; SPIE; Volume: 1692; Linguagem: Inglês

10.1117/12.138052

1996-756X

A. Hochbaum, James L. Fergason, Jesse D. Buck,

Liquid Crystal Research Advancements

We report the characteristics of a strong 3 rd order negative nonlinear effect in the nematic and smectic A liquid crystal phases as well as in the isotropic phase. Limiting is achieved as a result of a strong light scattering effect with some contribution from nonlinear absorption. We used an optical limiting setup to measure the limiting threshold and clamped output parameters. We present data regarding the dependence of these parameters on polarization direction, liquid crystalline order and alignment, depth of focus into the liquid crystal layer, cell thickness and temperature. We also discuss the temporal behavior of the limited pulses.