Abnehmbare Neutraldichtefilter und Abschwächer
Abnehmbare Neutraldichtefilter und Abschwächer
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| Spiricon has the most extensive array of accessories for beam profiling existing. There are components for attenuating, filtering, beam splitting,
magnifying, reducing and wavelength conversion. There are components for wavelengths from the deep UV to CO2 wavelengths. Most of the
components are modular so they can be mixed and matched with each other to solve almost any beam profiling requirement needed. |
| For almost all applications, the laser beam intensity is too high for the operating range of the CCD. Therefore ND glass attenuator filters are
available to reduce the intensity to the proper level at the CCD. In general, either the LBF-50 attenuating filer set or a set of individual screw on
filters is recommended. These filters are carefully designed not to affect beam quality or cause interference effects. One stackable ND1 filter and
2 ND2 filters are supplied standard with each camera. |
| LBF-50: The LBF-50 comes with a set of filters that are inserted into the flange shown, mounted on
top of each other and secured. A set of 6 filters is provided that can achieve attenuation anywhere
from OD 0.3 to OD 8. The LBF-50 is especially useful for CS or C mount cameras with the CCD
recessed way below the surface. The filters are recessed into the camera thus saving thickness as
shown in the illustration to the right. |
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| Stackable ND filters: The individual filters come in three versions, the ND1 filter in the red housing
with ~10% transmission in the visible, the ND2 filter in the black housing with ~1% transmission and
the ND3 filter in the green housing with ~0.1% transmission. The individual filters can be screwed
on top of each other and thus stacked. They are set at a small wedge angle in the housing so as not
to cause interference effects. |
| Specialized Filters: There are also specialized filters available to eliminate extraneous wavelengths
when measuring very short or very long wavelengths where the CCD cameras are not sensitive and
the desired signal can get swamped by extraneous light of other wavelengths. These filters are as
follows: |
| 1. The 355nm filter for monitoring the 3rd harmonic of YAG. This filter transmits 355nm but blocks 532nm and 1064nm.
2. The 1300nm filter transmits1300nm but blocks wavelengths shorter than 1100nm.
These filters are also on the same standard thread so can be mixed with all the other components.
See ordering information pages for more details. |
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| LBF - 50 filter assembly |
ND1, ND2 and ND3 stackable filters |
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| Specifications |
| Item |
LBF-50 |
ND1 / ND2 / ND3 |
| Nominal OD (vis) |
0.3, 0.7, 1, 2, 3, 4 |
1 , 2, 3 |
| Clear Aperture |
ø14mm |
ø19mm |
| Damage threshold |
50W/cm2 , 1J/cm2 for ns pulses |
|
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| Transmission vs. Wavelength |
| These "neutral density" or ND filters do not have a flat response in
attenuation vs. wavelength. See the graph for typical transmission
vs. wavelength characteristics. |
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| Continuously Variable Attenuator |
| For maximum ease of use there is the continuously variable attenuator that can vary its attenuation over a very wide range just by pushing
and pulling the filters laterally. The attenuator consists of two opposite wedges of ND glass. The surfaces are arranged so that no parallel
surfaces face each other so as to eliminate interference effects. |
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| The variable attenuator uses the same C mount thread as the other components so it can be combined with additional stackable filters and
beam splitters if necessary as shown. |
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| Ordering Information |
| Item |
Description |
P/N |
| LBF-50 filter set |
Compact screw in filter holder with set of ND filters. Attenuations from low to 106 |
SP90081 |
| ND1 stackable filter (red housing) |
4mm spacing screw on filter for camera with transmission of between 20% and 5% depending on spectral
range Can be stacked and combined with other filters and beam splitters.. One filter is included with Spiricon
cameras |
SPZ08234 |
| ND2 stackable filter
(black housing) |
4mm spacing screw on filter for camera with transmission of between 7% and 0.5% depending on spectral
range. Can be stacked and combined with other filters and beam splitters. Two filters are included with
Spiricon cameras |
SPZ08235 |
| ND3 stackable filter
(green housing) |
4mm spacing screw on filter for camera with transmission of between 2% and 0.05% depending on spectral
range. Can be stacked and combined with other filters and beam splitters |
SPZ08253 |
| Variable filter |
Continuously variable filter for complete control over beam intensity. Especially useful for pulsed lasers. Varies
the intensity over more than 4 orders of magnitude between wavelengths 350nm and 1100nm. Can be stacked
and combined with other filters and beam splitters |
SPZ17012 |
| Filter holder and 50x50 filter
set |
Filter holder with set of 4 standard Schott 50X50mm neutral density filters. Useful to reduce intensity before
inputting into 4X beam reducer. Mounts to standard ¼" thread, ½" diameter laboratory rod |
SPZ08240 |
| Filter for 355nm-V2; give an
undistorted image of the
355nm light. |
Silicon cameras can see the 355nm 3rd harmonic radiation of YAG. The YAG however usually emits some light
at 532nm and 1064nm as well. This filter filters out the other 2 wavelengths to give undistorted image of the
355nm light |
SPZ08246 |
| Filter for 1300nm |
For all cameras that can operate at 1300nm but are quite insensitive there. This filter filters out all light below
1200nm to allow viewing 1300nm radiation without background interference |
SPZ08242 |
| 4mm spacer |
Blank stackable spacer / filter holder where 4mm spacing is needed but no attenuation is needed |
SPG01698 |
| 5mm spacer |
Spacer ring for adapting 12.5mm recess CS cameras to 17.5mm recess C mount lenses |
SPG02106 |
| 8mm spacer |
Spacer ring for adapting 4.5mm recess cameras to work with 12.5mm recess CS mount lenses |
SPG02067 |
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