Princeton Camera Accessories NFC 446 040 User Manual

15 Discovery Way, Acton, MA 01720  
Phone: (978)263-3584, Fax: (978)263-5086  
Operating Instructions  
for  
NFC-446-040  
Raman Notch Filter  
Ver 2.0  
 
Figure 1: NFC-446-040 Layout (Top View)  
Mounting the NFC-446-040 to Acton Series Monochromators or Spectrographs:  
Use the illustration above for reference when mounting the NFC-446-040 to ARC  
monochromators or spectrographs.  
1. Unpack the NFC-446-040 Raman Notch Filter Chamber.  
2. Remove the cover of the NFC-446-040.  
3. Set the components on a stable, flat working surface. Position the NFC-446-040  
against the ENTRANCE SLIT of the Acton Series monochromator or spectrograph  
as shown in the illustration above. Align the mounting holes of the NFC-446-040  
with the tapped holes in the slit assembly.  
4. Insert the two (2) 8-32 screws provided through the mounting holes and into the  
tapped holes of the slit assembly. Tighten to secure the NFC-446-040 to the  
entrance slit.  
5. The NFC-446-040 includes a support post to help stabilize the system. This post  
should rest flat on the working surface, and should not exert stress on the system.  
The NFC-446-040 is now mounted to the Acton Series monochromator or  
spectrograph.  
 
Mounting a Filter inside the NFC-446-040:  
The standard filter holder inside the NFC-446-040 accepts 1.5” (38.1mm) diameter  
filters. Use the following procedure to mount filters:  
1. If not already completed, mount the  
NFC-446-040 to the monochromator or  
spectrograph.  
2. Remove the NFC-446-040 access cover.  
3. Locate the filter holder between the lenses.  
4. Slide the notch filter into the holder and  
secure it in position with the set-screw  
(located on top of the holder).  
5. Replace the access cover.  
Optimizing the NFC-446-040 for Best Performance:  
Lens Aperture Ratio:  
Under normal operating conditions with Acton Series monochromators and  
spectrographs, use the following lens aperture settings inside the NFC-446-040:  
SP-150, SP-275, or SP-300i: Set both lenses to an aperture of 4 or smaller.  
SP-500 or SP-500i: Set both lenses to an aperture of 6.5 or smaller.  
SP-750: Set both lenses to an aperture of 9.7 or smaller.  
Note: When using fiber optic input, especially when the fiber size or configuration of  
fibers is tall (e.g., a column of fibers), we recommend setting the aperture of the lens  
closest to the fiber at 1.8. This will permit efficient collection of the fiber output and  
will reduce possible vignetting of the light.  
Note: It is possible to adjust the lens apertures of the NFC-446-040 to optimize  
system performance. Reducing the aperture of the lenses, for example, will  
improve the overall image quality of the system.  
 
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.  
 

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