Strahlaufweiter und Mikroskopobjektive
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|Beam expanders are designed to work with C-mount threaded cameras that have 4.5mm imager back focal spacing or with CS (12.5mm) back focal spacing. 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.
|Shown is an image of the tip of a single mode fiber measuring 16μm by 30μm in the two axes. The beam width as measured shows 4X the actual size so we can measure to a resolution of ~2μm.|
|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|
|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 assembly SPZ08261.||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 assembly SPZ08261.||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 assembly SPZ08261.||SPZ08260|
|Spacer assembly 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.||SPZ17026|