Accession Number : ADP008063

Title :   A Multilayer Quarter-Wave Plate of Transmission Type at a Wavelength of 12.4 nm,

Corporate Author : TOHOKU UNIV SENDAI (JAPAN)

Personal Author(s) : Kimura, Hiroaki ; Yamamoto, Masaki ; Nomura, Hiroshi ; Mayama, Ko ; Yanagihara, Mihiro

Report Date : 05 MAR 1992

Pagination or Media Count : 4

Abstract : In order to measure or to transform the polarization state in the soft x-ray region, we need a suitable quarter-wave plate. Kortright and Underwood have shown theoretically that the transmission type multilayer has a good potential for a quarter wave plate in the soft x-ray region. They demonstrated as a good example, the Mo/Si multilayer which has a periodicity of 9.0 nm and 20 periods at the wavelength of 13.8 nm, has the retardation Delta p - Delta s=86 deg, the polarizance (Ts-Tp)/(Ts+Tp)=42% and the s throughput for s component of 39% at the incident angle of 39.7 deg-measured from the sample normal. The best quarter-wave plate should have the retardation equal to + or - 9O deg, the polarizance close to zero, and the high throughput over 50%. The multilayer designs presented here achieve these conditions necessary for good and useful quarter-wave plates. We have simulated the response of Ru/Si multilayer quarter wave plate of transmission type using a computer program based on an optical scheme with complex Fresnel reflection coefficients.

Descriptors :   *OPTICS, *LIGHT, *POLARIZATION, *SOFT X RAYS, ANGLES, COEFFICIENTS, COMPUTER PROGRAMS, COMPUTERS, PERIODIC VARIATIONS, PLATES, REFLECTION, MOLYBDENUM, REGIONS, RESPONSE, RETARDATION, SILICON, THROUGHPUT, RUTHENIUM, X RAYS.

Subject Categories : Nuclear Physics & Elementary Particle Physics
      Optics
      Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE