We study the dynamics of a three-dimensional laser bullet propagating inside a nonlinear saturable medium. We show that an increase of the pump parameter destabilizes the bullet and leads to its destruction through oscillations with increasing amplitude. We propose an inhomogeneous and anisotropic external excitation mechanism leading to a stable oscillating bullet. By varying the frequency of the external excitation, a stable quasi-in-phase or quasi-antiphase internal state can be reached.
We review current synthesis techniques for generating and improving birefringent filters. The relationship between wave-plate orientation and the resulting spectral output is shown to be that of a simple Fourier transform. By using this relationship and starting from the fan Solc configuration, we easily generated plate orientations providing lower sidelobe levels and improved finesse. We outline a method by which filters can be constructed to provide from 0 to 100% of the desired passband in a continuous fashion. Such a filter can be stacked to allow rapid control of any number of passbands and is shown, as an example in a novel design employing super-twisted nematic liquid crystal elements, to control a maximum of three color bands.
We discuss the design and performance of a full color transmissive display based on the folded Solc filter design. Sharp et. al. 5 suggested the use of a modified Solc filter as a colorswitch and for use as a display device 7 . Del Pico 6 suggested its use as a direct view device using plastic substrates and LCP's to solve some parallax issues. However no details of its operation were given. The design incorporates three individual stacks each responsible for producing RGB without the use of color filters, this offer high color purity and brightness along with the promise of low power consumption. In this paper the design of such a system is considered in detail.
A new method of generating color in liquid crystal displays using birefringent filters is shown. This method has the benefit of high light transmission and color saturation compared to traditional spatial or temporal multiplexing methods, which include highly absorptive color filters. We discuss the design and optimization of a double-layer supertwisted nematic color display based on polarization interference filters. The viewing angle of such a device is also modeled and improvements are shown. The device is capable of high light transmission (90% that of parallel polarizers) while retaining color saturation.
Polarization interference filter (PIF) based liquid crystal displays (LCD) have previously been shown to provide high brightness and good color saturation. These devices do not make use of color filters and therefore provide higher resolution and brightness. Such devices can be driven using active or passive matrix driving. In this paper we investigate the viewing angle (VA) performance of a passive matrix display which uses double layer super twisted nematic (DSTN) LCDs. The application of a negative birefringence film and biaxial retarders to improve the VA performance was modeled using the extended Jones matrix calculation and compared to the ideal positive birefringence compensator of the DSTN. The display's color sensitivity with respect to retarder angle and retardance was also modeled for typical manufacturing tolerances.
A color passive matrix display has been designed that has a high light transmission (85% that of parallel polarizers) and well saturated colors. The new design incorporates three STN devices with a Solc 3 filter to form an electrically switchable color switch that is multiplexable. In this paper the design of such a display is considered in detail.
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