Below are typical
measured spectra of Semrock's U-grade long-wave-pass (LWP) edge filters
available from stock. Also shown is the location of the associated laser
line for each filter. ASCII data for the filter design spectra is available
by clicking the link below each graph.
These filters are
designed to be used with light at or near normal incidence. To find
out more about how the spectra change
for light at higher angles of incidence, click here.
Important
measurement note: due to the unprecedented edge steepness
of these RazorEdge filters, it is very difficult to make accurate logarithmic
scale measurements, even with a high-performance double monochromator.
Therefore, we have chosen to display the actual measured data on a linear
scale below, and provide the theoretical design spectra in ASCII form
for more careful inspection. Precise measurements to verify actual laser-line
blocking are routinely performed on a number of these different filters
(particularly at 532 and 633 nm), using a laser system with a dynamic
range that exceeds OD 9. We are therefore highly confident that the
data provided accurately represent the actual spectral curves, even
in the difficult-to-measure laser-line blocking regions. In order to
properly measure high optical densities the measurement laser is first
filtered with a Semrock MaxLine laser-line filter
to prevent laser noise from reaching the detector and degrading the
measurement.
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