Effect of electric field on laser induced damage threshold of multilayer dielectric gratings.

This paper studies gratings engraved in multilayer dielectric stacks for ultra high intensity laser compressors application. We design various grating profiles with high reflected efficiencies for 1780 l/mm multilayer dielectric gratings (MLD). Each grating is defined to exhibit a different electric field maximum value in the pillars of the grating.

Parasites of South African wildlife. XIV. Helminths of nyalas (Tragelaphus angasii) in the Mkuzi Game Reserve, KwaZulu-Natal.

The helminthis of 58 nyalas (Tragelaphus angasil) culled in the Mkuzi Game Reserve, KwaZulu-Natal, during March 1991, and six culled during March 1994, were collected, identified and counted. Of these, an as yet undescribed Camelostrongylus sp., Cooperia hungl.

Holographic gratings for the Far Ultraviolet Spectroscopic Explorer: development, imaging, and efficiency tests of two prototypes.

We report on a study and test of two 6000-groove/mm prototype holographic gratings for NASA's FarUltraviolet Spectroscopic Explorer (FUSE) mission. The first grating was designed and developed onthe basis of the FUSE requirements as specified at the end of the first study in 1992. This design relieson an ellipsoidal grating, recorded with aberrated wave fronts to correct sagittal coma.