Accession Number : AD0700352

Title :   RULED GRATINGS FOR X-RAY AND FAR ULTRAVIOLET SPECTRA.

Descriptive Note : Final rept. 1 Apr 67-30 Sep 69,

Corporate Author : JOHNS HOPKINS UNIV BALTIMORE MD DEPT OF PHYSICS

Personal Author(s) : Bearden,J. Alvin

Report Date : 21 NOV 1969

Pagination or Media Count : 37

Abstract : A new process for making ruled gratings is described. A protective film of molybdenum and gold of about 300 A is sputtered on blanks of glass or quartz. A sharp pointed diamond properly loaded is used to cut a fine ruling through the protective film and slightly into the blank. Hydrofluoric acid is then used to etch a groove of the required depth and width. The grating is then coated with a reflectance coating of gold or platinum to increase its efficiency. With close control of the ratio of flat to groove width, one should be able to make a grating which maximizes intensity for a desired order and minimizes it for other selected neighboring orders. Technical details on various parts of the process are described. (Author)

Descriptors :   (*X RAYS, DIFFRACTION GRATINGS), (*ULTRAVIOLET EQUIPMENT, DIFFRACTION GRATINGS), (*DIFFRACTION GRATINGS, MANUFACTURING), SPUTTERING, ETCHING, REFLECTION, ELECTRON MICROSCOPY

Subject Categories : Optics
      Nuclear Physics & Elementary Particle Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE