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R :
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Cerium doped silica. Even after extensive
use there is pratically no violet coloured absorption
center near 540 nanometers.
This silica filters pratically
all the UV, no deterioration of doped glass rods or
reflectors, no ozone formation, and has no damaging
effect on the eyes.
Considerable conversion of UV
into fluorescence centered at 435 nanometers : particularly
recommended for pumping Yag crystals.
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N :
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Natural fused silica with little fluorescence
(selection of quartz crystals). After long use, coloured
centers appear near 540 nanometers, Robust material.
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H :
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Pure synthetic non-fluorescent silica.
No appearance of absorption at 540 nanometers. This
silica is mainly used for optical pumping of rubies
and for distant UV flash sources.
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G :
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Germicide-doped silica absorbing UVC.
No ozone formation. Very rapid appearance of coloured
absorbtion centers around 540 nanometers.
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FJ :
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Yellow filters stopping all UV, correcting
filter for colour photography. Withstands more than
600กษ in permanent use, in air. Coated on R silica.
No immersion.
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The spectral profile of xenon (and
for rare gases in general) is composed of continum of
radiation - visible part from 350 nm up to 750 nm-and
line radiation (atomic radiative transitions between
energy levels) - IR part from 750 nm. (see flgure beside)
Evolution of the radiation for 2 different current densities
: 3200 A/cm2 and 5400 A/cm2
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