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Operating Instructions for IARC-446-070 Raman Filter Chamber
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Figure 4. Close up view of the Sample Holder inside the 1ARC-446-070
Optimizing the IARC-446-070 for Best Performance
Lens Focus:
The IARC-446-070 is optimized for best performance when the light source image is in sharp focus on the
monochromator or spectrograph entrance slit. This can be accomplished using the following procedure:
1. Make sure that the IARC-446-070 is correctly mounted to the monochromator or spectrograph.
2. Mount the detection system to the monochromator or spectrograph. Verify that the detection system is
operating.
3. Position the edge or notch filter to normal incidence and illuminate the system with the laser line the filter
is designed to block. Visually inspect that the filter is blocking the laser line to a point which is
undetectable by the unaided eye before proceeding. Adjust the angle of the filter if needed.
4. Set the monochromator or spectrograph to a central wavelength corresponding to that of the laser line.
5. Operate the system and continuously monitor for intensity. Adjust the angle of the filter until the
intensity of the laser line is observable yet below the detector saturation level. Slowly adjust the focusing
lens until highest intensity is achieved.
6. When operating the IARC-446-070 with multiple light source inputs (a multi-leg fiber optic bundle, for
example), an imaging spectrograph, and a CCD detection system, it is recommended that the detection
system be operated in an imaging mode and the focus be adjusted until the best image quality of the
source(s) is achieved.
7. Finally, adjust the angle of the filter until a minimum in laser intensity is observed.
*NOTE: The collimating lens position is set at the factory and no further adjustment is necessary.
Filter Holder
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