RESUMO
The development of phased-array grating compressor is a crucial issue for high-energy, ultra-short pulse petawatt-class lasers. We present a theoretical and experimental analysis of two-grating phasing in a broadband pulse mosaic compressor. The phase defaults induced by misaligned gratings are studied. Monochromatic grating phasing is experimentally achieved with an interferometric technique and pulse compression is demonstrated with a two-phased-array grating system.
Assuntos
Hemiplegia/etiologia , Ataque Isquêmico Transitório/etiologia , Postura , Idoso , Humanos , MasculinoRESUMO
During ocular treatments by drops of INDOCID are observed 4 superficial punctuate keratitis disappearing when INDOCID is discontinued, and 2 diffuse corneal oedemas. Some possible explanations for such a corneal involvement are suggested.
Assuntos
Edema da Córnea/induzido quimicamente , Indometacina/efeitos adversos , Ceratite/induzido quimicamente , Adulto , Idoso , Idoso de 80 Anos ou mais , Feminino , Humanos , Masculino , Soluções OftálmicasRESUMO
We propose a new, to our knowledge, method for determining the two main critical parameters of periodic one-dimensional lamellar structures, namely, linewidths and etched depths. The method is simple and requires only two measurements for the phase of the zero-transmitted order under two orthogonal polarizations. It is inspired by the analogy between subwavelength gratings and anisotropic homogeneous thin films. The method is tested with experimental data obtained with a Mach-Zehnder interferometer. Etched depths and linewidths derived from the interferograms and electromagnetic theory are compared with scanning-electron-microscope observations.