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Lens Focus:
The NFC-446-040 is optimized for best performance when the light source image is
in sharp focus on the monochromator or spectrograph entrance slit, and both
lenses are set to the same focus position. This can be accomplished using the
following procedure:
1. Assure that the NFC-446-040 is correctly mounted to the monochromator or
spectrograph.
2. Mount the detection system to the monochromator or spectrograph. Assure that
the detection system is operating.
3. Use a light source with line spectrum output, such as a mercury pen-ray lamp.
4. Set the monochromator or spectrograph to a central wavelength of 435.8nm if
using a mercury source, or the corresponding wavelength to match your light
source output if it is not mercury. If no line source is available, use a white light
source and set the monochromator or spectrograph to a central wavelength of
0.0 nm.
5. Operate the system and continuously monitor for intensity. Slowly adjust the
lenses until highest intensity is achieved, and both lenses are set to the same
focus position.
6. When operating the NFC-446-040 with multiple light source inputs (a multi-leg
fiber optic bundle, for example), an imaging spectrograph, and a CCD detection
system, we recommend operating the detection system in an imaging mode and
adjusting the lenses until best image quality is achieved.