Integration Guide

Installation
10 DE2011-DL
Table 1. Exit window materials
Optical Quality Very good Very good
Surface Hardness Hard coating required Hard coating required
Impact Resistance Good
Good
Chemical / UV Resistance Susceptible Susceptible
Ultrasonically Welding Compatible Compatible
Exit window properties
Recommended properties/performance of the exit window are reported in
Table 2 below.
Table 2. Exit Window Properties
Material PMMA or CR39 or equivalent
Thickness 1.5mm
Wavefront distortion
0.2 wavelengths peak-to-valley maximum and
0,04 λ maximum rms over any 2.0mm diameter within the clear
aperture
Clear aperture To extend to within 1.0mm of edges all around
Surface quality
60/20 scratch/dig
AR coating
• double sided
• transmittance > 97% minimum wi
thin spectrum range
400nm-750nm.
• reflections max 0,4% per side in the range 620nm-640nm
Properties
PMMA
(cell cast acrylic or
polymethyl methacrylic)
CR39
(Allyl Diglycol
Carbonate)
Characteristics Requirement