Volume 98, Issue 7, 01 October 2005
Index of content:
- LASERS, OPTICS, AND OPTOELECTRONICS
98(2005); http://dx.doi.org/10.1063/1.2071450View Description Hide Description
In this paper, the physics that determines the performance limits of a diffractive optical element based on a liquid-crystal(LC) optical phased array(OPA) is investigated by numerical modeling. The influence of the fringing electric fields, the LC material properties, and the voltage optimization process is discussed. General design issues related to the LCOPA configuration, the diffraction angle, and the diffraction efficiency are discussed. A design for a wide-angle LCOPA is proposed for high-efficiency laser beam steering. This work provides fundamental understanding for a light beam deflected by a diffractiveliquid-crystal device.
98(2005); http://dx.doi.org/10.1063/1.2084307View Description Hide Description
A six-temperature kinetic model for a system is used to describe the dynamic processes of a mechanical Q-switched laser that is set up using a fast chopper. We put special emphasis on the effect of dynamical parameters on the laser intensity. It takes into account the effects of electrical excitation, energy transfer processes, thermal energy transport, as well as the dissociation of molecules and rotational relaxation of rotational levels. The results calculated are in satisfactory agreement with experimental data.