Lg. Neto et al., FULL-RANGE, CONTINUOUS, COMPLEX MODULATION BY THE USE OF 2 COUPLED-MODE LIQUID-CRYSTAL TELEVISIONS, Applied optics, 35(23), 1996, pp. 4567-4576
Switchable, continuous, complex-amplitude modulation is demonstrated w
ith two cascaded, twisted nematic liquid-crystal televisions(LCTV's),
both operating in phase- and amplitude-coupled modulation modes. The c
ondition for full-range complex modulation is that one of the LCTV's m
ust provide a a 2 pi-range phase modulation. A look-up table encoding
method is proposed that permits the compensation of phase-amplitude co
upling and nonlinearity in the two individual LCTV modulations. Experi
mental techniques for determining the LCTV-device parameters, for maxi
mizing the phase-mostly modulation range and the amplitude-mostly modu
lation contrast, and for testing the complex-amplitude modulation are
developed. Optical complex-amplitude Fresnel holograms are shown. (C)
1996 Optical Society of America