4X-Strahlaufweiter mit UV-Konverter
Unsere UV-Bildwandler bestehen aus fluoreszierenden Scheiben, mit denen die von CCD-Kameras schlecht zu erfassende UV-Strahlung in sichtbares Licht umgewandelt wird, das wiederum auf die Kamera geleitet wird. Diese fluoreszierenden Scheiben werden speziell für die UV-Umwandlung entwickelt und verfügen über eine hohe Lichtleistung, einen großen linear dynamischen Bereich sowie eine hohe Zerstörschwelle.
|Download Data Sheet.|
|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.|
The UV converter is a UV sensitive plate that can be mounted over the 4X Beam Expander.
The UV sensitive plate is positioned at the object plane of the 4X beam expander, 8 mm in front of the unit. When UV radiation hits the fluorescent plate, it absorbs the UV radiation and re-emits visible light proportionate to the incident UV light. This light pattern is then expanded 4 times and imaged onto the imager of a C-mount camera.
|Specifications||4X Beam Expander with UV converter|
|Beam Reduction||4X expansion ±2% with included correction factor|
|Spectral range||193 - 360nm|
|Resolution||15µm x 15µm;|
|Saturation intensity||~30mJ/cm² at 193nm, ~15mJ/cm² at 248nm 20 times greater with optional beam splitter|
|Effective Aperture||1/4 the size of the CCD dimensions|
|Damage threshold||0.1J/cm² w/o beam splitter, 2J/cm² w/ beam splitter|
|Dimensions||Ø31mm dia x 120mm length|
|UV converter assembly for 4X beam expander||Screw on assembly which has UV plate to convert 193 - 360nm radiation to visible. The plate is at the object plane of the 4X expander (P/N SPZ17022) and produces a 4X enlarged image on the CCD. Requires separate purchase of 4X reimagine beam expander SPZ17022||SPZ17019|
|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|
|Beam splitter for above||45 degree wedged beam splitter to reduce intensities by ~20X. For beam intensities of up to 300mj/cm² at 193nm.||SPZ17027|