A Multilayer Quarter-Wave Plate of Transmission Type at a Wavelength of 12.4 nm,
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 05, 1992
- Accession Number
- ADP008063
Entities
People
- Hiroaki Kimura
- Hiroshi Nomura
- Ko Mayama
- Masaki Yamamoto
- Mihiro Yanagihara
Organizations
- Tohoku University