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BEAM SPLITTERS

ACHROMATIC BEAM SPLITTERS

Achromatic beam splitters are partially transparent mirrors and are available with various division ratios. The mirrors are absorption-free to a great extent and the visual area is only slightly spectrally dependent on the division ratio. These filters are anti-reflection-coated on the rear side. The AT 50 has a narrow-band antireflection coating (AR2) on the backside, the other types are equipped with a broadband antireflection (AR4).

Optical specification
Type ratio transmission : reflection
AT80 80% ± 5% : 20% ± 5%
AT70 70% ± 5% : 30% ± 5%
AT60 60% ± 5% : 40% ± 5%
AT50 50% ± 5% : 50% ± 5%
Stability of the coating
Solubility, resistant to water, weak alkaline solutions
alcoholic solvents, glass cleaner
Temperature stability short-term up to 450 °
Abrasion resistance according to DIN ISO 9211-3; severity level 1 / Crockmeter
Adhesive stability according to DIN ISO 9211-3; severity level 3 / Scotch tape test
Moisture resistance according to DIN ISO 9211-3; 40°C 90%-95% rel. humidity, 10 days
Coating defects
5/ C 5St x 1,0 (5/ CN´x A´) according to DIN ISO 10 110, part 7
referring to a surface of 100mm x 100mm C Indicator for surface errors
flaws < 0,2mm are ignored N´ the number of allowable coating defects
A´ the grade number
Scratches
5/ L 3St x 0,15mm (5/ LN´´x A´´) according to DIN ISO 10 110, part 7
referring to a surface of 100mm x 100mm L Indicator for scratches
defects < 0,05mm are ignored N´´the number of allowable scratches
A´´ the maximum tolerable width of the scratches in mm