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Holographic Laser Bandpass Filters
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Our Holographic Laser Bandpass Filters are fabricated by
recording interference patterns formed between two mutually
coherent laser beams, unlike conventional interference filters,
which are made by vacuum evaporation techniques. These filters
represent a major technical breakthrough in the optical filtering
of unwanted plasma lines or fluorescence from laser sources.
By using the unexpanded laser beam and combining high laser
throughput with narrow spectral bandwidth, the Holographic
Bandpass Filter provides the user with a previously unattainable
level of performance.
| Specifications |
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| Laser Throughput |
>90% of S-polarized laser line |
| Spectral Bandwidth |
<2 nm at O.D. 0.3 or 50% points
with user supplied spatial filter (aperture) |
| Laser Damage Threshold |
>5 watts C.W. unexpanded at 514
nm and 1064 nm |
| Wavelength Range |
Standard Wavelengths (nm):
442, 457, 476, 488, 514, 532, 568, 633, 647, 752, 785, 1064
Custom Wavelengths: Between 457.9 nm and 1064 nm
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| Environmental Stability |
No detectable performance change
after cycling between -50ºC to +80ºC and returned to
room temperature. |
| Size |
24.2 x 24.2 mm footprint, 20 mm
high |
| Warranty |
3 Years |
Theory
of Operation
The Holographic Bandpass Filter consists of a volume transmission
grating located between two prisms. A collimated S-polarized
laser beam is directed perpendicularly into the cube. The
internal transmission grating diffracts the laser line through
90 degrees so that the output beam is nominally perpendicular
to the exit face of the cube. The grating is spectrally selective
so only the light which is very close to the design wavelength
of the filter is diffracted. The undiffracted light passes
through the back face of the cube. Unwanted light with wavelengths
near the laser line is diffracted by the transmission grating
but at a different angle than the laser line. This unwanted diffracted light can be removed by a spatial filter (slit or aperture) located beyond the exit face of the cube.
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Product Material
Product Material
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