issue date:2016-3-31 15:35:44 visit frequency:2976
Long wavepass filters are ideal for a variety of applications, such as gas monitoring, temperature, sensing, thermal imaging and motion sensing etc. Long wavepass filters block shorter wavelengths and transmit longer wavelengths. Blocking can be from reflectance, absorption or a combination. Transmission in the pass band can be enhanced with an antireflection coating on the second surface.
Long wavepass filters (also referred to as edge filters) are constructed from stacks of thin layers. They are distinguished by a sharp transition from a zone of rejection to a zone of transmission. When ordering it is necessary to specify the required 5% or 50% cut on edge position (the 5% point is measured as an absolute value but the 50% point is measured as 50% of peak transmittance).
XF Photonics offers a variety of blocking ranges and densities, and the cut-off wavelength can be positioned anywhere from the UV to NIR.
Substrates |
N-BK7, Float glass, Fused Silica, or others |
Dimensions |
25mm or customize |
Dimensional Tolerance |
+0/-0.2mm |
Clear Aperture |
>85% |
Thickness |
3.0mm |
Thickness Tolerance |
±0.1mm |
Surface Quality |
60 – 40 |
Transmitted Wavelength |
1/4 lambda |
Transmission |
>85% |
Transmission Wavelength |
420-2000nm |
Rejection Wavelength |
200-375nm |
Cut-On Wavelength |
400nm |
Cut-On Tolerance |
±2% |
Slope Factor |
3% |
Optical Density (OD) |
>2 |
Angle of Incidence |
0° |
RoHS |
Compliant |
Type of long wave pass filter |
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Type |
CWL(nm) |
Blocking range(nm) |
Cutoff rate (%) |
Transmission wave(nm) |
Transmissivity (%) |
LP390 |
390 |
200nm~380nm |
<0.01% |
400nm~1100nm |
T>90% |
LP420 |
420 |
200nm~410nm |
<0.01% |
430nm~1100nm |
T>90% |
LP520 |
520 |
200nm~500nm |
<0.01% |
530nm~1100nm |
T>90% |
LP550 |
550 |
350nm~540nm |
<0.01% |
560nm~1100nm |
T>90% |
LP570 |
570 |
350nm~560nm |
<0.01% |
580nm~1100nm |
T>90% |
LP590 |
590 |
350nm~580nm |
<0.01% |
600nm~1100nm |
T>90% |
LP600 |
600 |
350nm~590nm |
<0.01% |
610nm~1100nm |
T>90% |
LP630 |
630 |
350nm~620nm |
<0.01% |
640nm~1100nm |
T>90% |
LP690 |
690 |
350nm~680nm |
<0.01% |
700nm~1100nm |
T>90% |
LP700 |
700 |
350nm~690nm |
<0.01% |
710nm~1100nm |
T>90% |
LP740 |
740 |
350nm~730nm |
<0.01% |
750nm~1100nm |
T>85% |
LP800 |
800 |
350nm~790nm |
<0.01% |
810nm~1100nm |
T>85% |
LP850 |
850 |
350nm~840nm |
<0.01% |
860nm~1100nm |
T>85% |
LP900 |
900 |
350nm~890nm |
<0.01% |
910nm~1100nm |
T>85% |
LP940 |
940 |
350nm~930nm |
<0.01% |
950nm~1100nm |
T>85% |
next:Narrow Band Filters