Access to SPIE eBooks is limited to subscribing institutions. Access is not available as part of an individual subscription. However, books can be purchased on SPIE.Org
Chapter 11:
Windows and Filters
Published: 1994
DOI: 10.1117/3.176482.ch11
Due to the high absorption of all materials in the XUV region all windows and filters have to be thin membranes with thicknesses in the 0.1- to 10-μm range. We see from Fig. 2.5 that Be, C, Al, and Mg have low absorption coefficients. However, a material which can be made thinner might give higher transmission, even if it has a larger absorption coefficient. The art of fabricating such thin membranes has evolved over the last 30 years and has been reviewed [1–3]. Several suppliers can provide standard membranes and are able to provide customized structures [4–6]. The main function of a window is to separate two environments but transmit the desired radiation. Examples are: - Protect the ultrahigh vacuum of a synchrotron source from the vacuum or atmosphere in the instrument of a user; - Separate the atmosphere in a flow-proportional counter from the vacuum of the experiment; - Support an absorber pattern in a mask for x-ray lithography; - Protect an experiment from the debris of a laser plasma x-ray source. Windows should have the highest possible transmission for the desired radiation. However, because all materials have absorption, and the absorption changes with wavelengths, each window will also have a filter function. It will transmit some wavelengths more than others.
Online access to SPIE eBooks is limited to subscribing institutions.


Optical filters


Absorption filters


Atmospheric plasma

Visible radiation

Back to Top