Beam expanders are available for 4.5mm spacing CS mount 12.5mm spacing cameras. The 4x beam expander is an expanding telescope that images the
beam as it looks at 8mm from the end of the expander onto the CCD while enlarging the image 4x. In addition to the 4x beam expander, other microscope
objectives are available for expanding the beam even more. There are objectives for 6x, 12x and 22x expansion. The various expanders allow the use of our
2% and 10% filters as well as the variable attenuator so as to accommodate the camera to a wide range of source intensities .
With a camera having 4.4µm pixel spacing using the beam expander, the effective resolution can be as good as 0.5µm.
The object plane that is imaged onto the CCD is located several mm in front of the assembly so even hard to get to focal spots and other small images
are easy to image. The beam expanders are designed to accommodate up to 3 screw on filters or a variable attenuator behind them so a wide range of
intensities can be accommodated.
For intensities too large to be accommodated by just filters, beam splitters are available to reduce the intensity before the beam expander The beam
expander is primarily intended for nonparallel beams such as focal spots and fiber tips. If small parallel beams are imaged, interference effects may
occur.
The 4x Beam expander can also be fitted with a UV converter plate at its object plane so that you can look at small beams in the spectral range 193-360nm
and expand them 4x. See ordering information for further details.
Approximate expansion ratio
Spectral range
Distance from lens barrel to focus
Distance from focus to 1st beam splitter
Distance of closest approach to focus with 1 beam splitter
Total length of assembly
4X
400 - 1800nm
8mm
18mm
32mm
50mm
6X
600 - 1064nm
16mm
10mm past 1st surface
4.5mm
107mm
12X
600 - 1064nm
6mm
6mm
20mm
101mm
22X
600 - 1064nm
2.4mm
8mm
22mm
102mm
Ordering Information
Beam Expanders and Microscope Objectives
Item
Description
P/N
4X reimaging beam expander
Screw optical assembly that images the plane 8 mm in front of the expander onto the CCD while
enlarging it 4X. Fits 4.5mm recess and CS mount cameras.
SPZ17022
Fiber adapter bracket for 4X
beam expander
Screw on bracket to use with Ophir fiber adapters so fiber is held in correct position to image fiber tip
onto camera. Will give exact focus with FC type fiber.
SPG01649
UV converter assembly for 4X
beam expander
Screw on assembly which has UV plate that converts 193 - 360nm radiation to visible. This plate is at
the object plane of the 4X expander so it produces a 4X enlarged image on the CCD
SPZ17019
6X expanding microscope
objective
Screw optical assembly that images the plane 16mm in front of the lens onto the CCD while enlarging it
~6X. Fits 4.5mm recess and CS mount cameras. Needs spacer assy below.
SPZ08257
12X expanding microscope
objective
Screw optical assembly that images the plane 6mm in front of the lens onto the CCD while enlarging it
~12X. Fits 4.5mm recess and CS mount cameras. Needs spacer assy below.
SPZ08259
22X expanding microscope
objective
Screw optical assembly that images the plane 2.6mm in front of the lens onto the CCD while enlarging it
~22X. Fits 4.5mm recess and CS mount cameras. Needs spacer assy below.
SPZ08260
Spacer assy for objectives
Spacer assembly for above. One only needed for all expanders above
SPZ08261
Beam splitter for expanders
above
45 degree angle wedge beam splitter which mounts onto beam expander. Reduces beam intensity by
~20 times. For spectral range 190 - 2500nm. Introduces 35mm extra beam path to object plane.
SPZ17027
Additional beam splitter for
above
Additional beam splitter to mount to 1st beam splitter
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Strahlaufweiter und Mikroskopobjektive 
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