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Operating Instructions
Raman Filter Chamber
Description:
The Princeton Instruments Model IARC-446-070 is a filter chamber which
permits use of Raman notch or edge filters with Acton series monochromators
and spectrographs. The Raman Filter Chamber is designed to operate over the
wavelength range of 633nm to 1100nm. Although the unit is used primarily to
collect the output of fiber optics, it may also be used with other sources of
Raman scatter (e.g., focused sample image or direct collection of scatter from a
sample positioned close to the chamber).
The standard IARC-446-070 includes a lens chamber with a filter holder designed
to accept a 1.750 inch outside diameter filter or a 1.750 inch outside diameter
filter assembly. A 1inch filter adapter is provided and installed in the Raman Filter
Chamber. This adapter is designed to accept a 1 inch or 25mm outside diameter
filter/ filter assembly. Other filter holders are available on a custom order basis. Filters can be rotated up to 10°
by an external set screw in order to tilt-tune the rejection band of the filter.
Principle of Operation:
The IARC-446-070 is designed to provide a collimated beam
for operation with notch or edge filters. The first lens collects
and collimates the beam through the filter. The second lens
collects the collimated beam and focuses it to the entrance slit
of the monochromator or spectrograph. The light is then
dispersed to a detection system.
The integrated tilt adjustment capabilities of the IARC-446-070
enable fine tuning of notch or edge filters to achieve the best
combination of laser light blocking and Raman scatter
transmission.
Figure 1. Raman Notch/Edge
Filter Chamber
Figure 2. Inside View of Chamber Showing the
Filter Holder between the Focusing and
Collimating Lenses