Long pass filters are designed to transmit wavelengths greater than the cut-on wavelength of the filter.
Long pass filters are used to isolate portions of the spectrum in a variety of industrial or life sciences applications including microscopy or fluorescence instrumentation.
Certain Long pass Filters can also be used as cold mirrors to minimize the heat buildup often caused by infrared radiation.
DELN offers a variety of long pass filters with high blocking and maximized transmission.
Specifications
Material
Float glass, B270, BK7, Fused Silica or other
Dimension Tolerance
+0.0/-0.1mm
Thickness Tolerance
±0.2mm
Surface Quality
60/40 or better
Clear Aperture
>90%
Coating
Hard Dielectric Sputtered
Angle of Incidence
0°
Pass Band Transmission
>85% (According to customer's specifications)
Rejection Band Blocking
OD4(According to customer's specifications)
Cut-On Wavelength (+/-1%)
Transmission Band (nm)
Rejection Band (nm)
400 nm
410-1100
200-390
450 nm
460-1100
200-440
500 nm
510-1100
200-490
550 nm
560-1100
200-540
600 nm
610-1100
200-590
650 nm
660-1100
200-640
700 nm
710-1100
200-685
750 nm
770-1100
400-730
800 nm
820-1100
400-780
850 nm
870-1100
400-830
900 nm
920-1100
400-880
Other Cut-On Wavelength and specificationsare available upon request.
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