Point diffraction interferometry at soft x-ray wavelengths
- Lawrence Livermore National Lab., CA (United States)
- AlliedSignal Technical Services, Livermore, CA (United States)
To achieve the image performance necessary for soft x-ray projection lithography, interferometric testing at the design wavelength is required to accurately characterize the wavefront of the imaging system. The wavefront depends not only on the surface figure of the individual optics and on their relative alignment, but also on aperture dependent phase shifts induced by the resonant multilayer coatings on the optical surfaces. This paper describes the design and lithographic fabrication of an array of point diffraction interferometers on a silicon nitride membrane that has been over-coated with a spatially graded partially transmitting film to provide fringe contrast control. Experimental results using a visible light analogue (larger pinholes and different transmission gradient) will be shown.
- Research Organization:
- Lawrence Livermore National Lab., CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 10182906
- Report Number(s):
- UCRL-JC-114496; CONF-9305159-5; ON: DE93019153
- Resource Relation:
- Conference: Optical Society of America (OSA) topical meeting on soft x-ray projection lithography,Monterey, CA (United States),10-12 May 1993; Other Information: PBD: Jul 1993
- Country of Publication:
- United States
- Language:
- English
Similar Records
Extreme ultraviolet interferometry
Interferometry using undulator sources