Short Pass Filters | Dynasil

Optometrics

Short Pass Filters

Typical short pass filter curve A Short Pass filter or Short Wave Pass filter (“SP”) is a filter that transmits at shorter wavelengths and rejects longer wavelengths. By design, the transition in a short pass filter between the 50% cut-off or cut-on to rejection is quite sharp. This makes it much easier to separate excitation from emitted wavelengths without interfering with wavelengths of interest. Short pass filters are useful in applications where spectral noise reduction is important or for isolating a particular region of the spectrum.

Applications include:

Emission filters in fluorescence applications
Elimination of unwanted radiation
In spectroscopy
As order sorting filters
In astronomical applications
In laser-induced fluorescence to isolate source radiation.

Features

A standard Short Pass filters available every 50 nm from 450 nm to 1000 nm
Mounted in a black anodized aluminium ring.
Use in combination with long pass filters for custom bandpass filtering
Fine tune cut-on wavelengths by changing angle of incidence

Product SKUs

Short Pass Filter Specifications | SP-1000-25

Cut-Off Wavelength	1000 nm	Cut-Off Tolerance	±15 nm
Transmission Region	Cut-off λ to 700 nm	Minimum Peak Transmission	80%
Slope (OD 0.3 to 4.0)	3%	Blocking	10-4 Min. / 10-5 Avg. to 1,300 nm
Size (mm)	25 mm dia.	Size Tolerance	+0.0/-0.2 mm
Thickness	6.3 mm	Thickness Tolerance	+0.0/-0.2 mm
Scratch/Dig	80/50	Clear Aperture	21 mm
Mount	Aluminum, Black Anodized	Operating Temperature Range	-20⁰ C to 75⁰ C
Cut-Off Wavelength (Range)	900 – 1000 nm

Short Pass Filter Specifications | SP-450-25

Cut-Off Wavelength	450 nm	Cut-Off Tolerance	±3 nm
Transmission Region	Cut-off λ to 400 nm	Minimum Peak Transmission	70%
Slope (OD 0.3 to 4.0)	3%	Blocking	10-4 Min. / 10-5 Avg. to 585 nm
Size (mm)	25 mm dia.	Size Tolerance	+0.0/-0.2 mm
Thickness	6.3 mm	Thickness Tolerance	+0.0/-0.2 mm
Scratch/Dig	80/50	Clear Aperture	21 mm
Mount	Aluminum, Black Anodized	Operating Temperature Range	-20⁰ C to 75⁰ C
Cut-Off Wavelength (Range)	450 – 599 nm

Short Pass Filter Specifications | SP-500-25

Cut-Off Wavelength	500 nm	Cut-Off Tolerance	±3 nm
Transmission Region	Cut-off λ to 400 nm	Minimum Peak Transmission	70%
Slope (OD 0.3 to 4.0)	3%	Blocking	10-4 Min. / 10-5 Avg. to 650 nm
Size (mm)	25 mm dia.	Size Tolerance	+0.0/-0.2 mm
Thickness	6.3 mm	Thickness Tolerance	+0.0/-0.2 mm
Scratch/Dig	80/50	Clear Aperture	21 mm
Mount	Aluminum, Black Anodized	Operating Temperature Range	-20⁰ C to 75⁰ C
Cut-Off Wavelength (Range)	450 – 599 nm

Short Pass Filter Specifications | SP-550-25

Cut-Off Wavelength	550 nm	Cut-Off Tolerance	±3 nm
Transmission Region	Cut-off λ to 400 nm	Minimum Peak Transmission	80%
Slope (OD 0.3 to 4.0)	3%	Blocking	10-4 Min. / 10-5 Avg. to 715 nm
Size (mm)	25 mm dia.	Size Tolerance	+0.0/-0.2 mm
Thickness	6.3 mm	Thickness Tolerance	+0.0/-0.2 mm
Scratch/Dig	80/50	Clear Aperture	21 mm
Mount	Aluminum, Black Anodized	Operating Temperature Range	-20⁰ C to 75⁰ C
Cut-Off Wavelength (Range)	450 – 599 nm

Short Pass Filter Specifications | SP-600-25

Cut-Off Wavelength	600 nm	Cut-Off Tolerance	±3 nm
Transmission Region	Cut-off λ to 420 nm	Minimum Peak Transmission	80%
Slope (OD 0.3 to 4.0)	3%	Blocking	10-4 Min. / 10-5 Avg. to 780 nm
Size (mm)	25 mm dia.	Size Tolerance	+0.0/-0.2 mm
Thickness	6.3 mm	Thickness Tolerance	+0.0/-0.2 mm
Scratch/Dig	80/50	Clear Aperture	21 mm
Mount	Aluminum, Black Anodized	Operating Temperature Range	-20⁰ C to 75⁰ C
Cut-Off Wavelength (Range)	600 – 700 nm

Short Pass Filter Specifications | SP-650-25

Cut-Off Wavelength	650 nm	Cut-Off Tolerance	±3 nm
Transmission Region	Cut-off λ to 455 nm	Minimum Peak Transmission	80%
Slope (OD 0.3 to 4.0)	3%	Blocking	10-4 Min. / 10-5 Avg. to 845 nm
Size (mm)	25 mm dia.	Size Tolerance	+0.0/-0.2 mm
Thickness	6.3 mm	Thickness Tolerance	+0.0/-0.2 mm
Scratch/Dig	80/50	Clear Aperture	21 mm
Mount	Aluminum, Black Anodized	Operating Temperature Range	-20⁰ C to 75⁰ C
Cut-Off Wavelength (Range)	600 – 700 nm

Short Pass Filter Specifications | SP-700-25

Cut-Off Wavelength	700 nm	Cut-Off Tolerance	±3 nm
Transmission Region	Cut-off λ to 490 nm	Minimum Peak Transmission	80%
Slope (OD 0.3 to 4.0)	3%	Blocking	10-4 Min. / 10-5 Avg. to 910 nm
Size (mm)	25 mm dia.	Size Tolerance	+0.0/-0.2 mm
Thickness	6.3 mm	Thickness Tolerance	+0.0/-0.2 mm
Scratch/Dig	80/50	Clear Aperture	21 mm
Mount	Aluminum, Black Anodized	Operating Temperature Range	-20⁰ C to 75⁰ C
Cut-Off Wavelength (Range)	600 – 700 nm

Short Pass Filter Specifications | SP-750-25

Cut-Off Wavelength	750 nm	Cut-Off Tolerance	±3 nm
Transmission Region	Cut-off λ to 525 nm	Minimum Peak Transmission	80%
Slope (OD 0.3 to 4.0)	3%	Blocking	10-4 Min. / 10-5 Avg. to 975 nm
Size (mm)	25 mm dia.	Size Tolerance	+0.0/-0.2 mm
Thickness	6.3 mm	Thickness Tolerance	+0.0/-0.2 mm
Scratch/Dig	80/50	Clear Aperture	21 mm
Mount	Aluminum, Black Anodized	Operating Temperature Range	-20⁰ C to 75⁰ C
Cut-Off Wavelength (Range)	701 – 899 nm

Short Pass Filter Specifications | SP-800-25

Cut-Off Wavelength	800 nm	Cut-Off Tolerance	±15 nm
Transmission Region	Cut-off λ to 560 nm	Minimum Peak Transmission	80%
Slope (OD 0.3 to 4.0)	3%	Blocking	10-4 Min. / 10-5 Avg. to 1,040 nm
Size (mm)	25 mm dia.	Size Tolerance	+0.0/-0.2 mm
Thickness	6.3 mm	Thickness Tolerance	+0.0/-0.2 mm
Scratch/Dig	80/50	Clear Aperture	21 mm
Mount	Aluminum, Black Anodized	Operating Temperature Range	-20⁰ C to 75⁰ C
Cut-Off Wavelength (Range)	701 – 899 nm

Short Pass Filter Specifications | SP-850-25

Cut-Off Wavelength	850 nm	Cut-Off Tolerance	±15 nm
Transmission Region	Cut-off λ to 595 nm	Minimum Peak Transmission	80%
Slope (OD 0.3 to 4.0)	3%	Blocking	10-4 Min. / 10-5 Avg. to 1,105 nm
Size (mm)	25 mm dia.	Size Tolerance	+0.0/-0.2 mm
Thickness	6.3 mm	Thickness Tolerance	+0.0/-0.2 mm
Scratch/Dig	80/50	Clear Aperture	21 mm
Mount	Aluminum, Black Anodized	Operating Temperature Range	-20⁰ C to 75⁰ C
Cut-Off Wavelength (Range)	701 – 899 nm