130 BD LSR II User’s Guide
Figure A-5 Bandpass filter
BP and DF filters have the same general function—they transmit a relatively
narrow band of light. The principal difference between them is their
construction. DF filters have more cavities or layers of optical coatings, resulting
in a steeper transmission curve than the curve for a BP filter. This steep slope
means that a DF filter is better at blocking light outside the rated bandwidth of
the filter.
wavelength (nm)
% transmission
bandpass
wavelength (nm)
% transmission
BP 500/50 filter
DF 500/50 filter
AF 500/50 filter
LSR2.book Page 130 Tuesday, April 25, 2006 3:34 PM
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