Long Pass Filters | Dynasil with Transmission Region Cut-on λ to 2.2 µ minimum

Optometrics

Long Pass Filters with Transmission Region Cut-on λ to 2.2 µ minimum

A Long Pass Filter or Long Wave Pass filter (“LP”) is one that transmits at longer wavelengths and rejects shorter wavelengths. By design, the transition in a long pass filter between the 50% cut-on to rejection is quite sharp. This makes it much easier to separate excitation from emitted wavelengths without interfering with wavelengths of interest. Long 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 Long Pass filter available every 50 nm from 500 nm to 1500 nm
Mounted in a black anodized aluminium ring.
Use in combination with short pass filters for custom bandpass filtering
Fine tune cut-on wavelengths by changing angle of incidence

Product SKUs

Long Pass Filter Specifications | LP-500-25

Cut-On Wavelength	500 nm	Cut-On Tolerance	±3 nm
Transmission Region	Cut-on λ to 2.2 µ minimum	Minimum Peak Transmission	80%
Slope (OD 0.3 to 4.0)	3%	Blocking	10-4 Int. Min. / 10-5 Int. Avg.
Blocking Range	200 nm-Cut On λ	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-On Wavelength (Range)	400 – 500 nm

Long Pass Filter Specifications | LP-550-25

Cut-On Wavelength	550 nm	Cut-On Tolerance	±3 nm
Transmission Region	Cut-on λ to 2.2 µ minimum	Minimum Peak Transmission	80%
Slope (OD 0.3 to 4.0)	3%	Blocking	10-4 Int. Min. / 10-5 Int. Avg.
Blocking Range	200 nm-Cut On λ	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-On Wavelength (Range)	501 – 700 nm

Long Pass Filter Specifications | LP-600-25

Cut-On Wavelength	600 nm	Cut-On Tolerance	±3 nm
Transmission Region	Cut-on λ to 2.2 µ minimum	Minimum Peak Transmission	80%
Slope (OD 0.3 to 4.0)	3%	Blocking	10-4 Int. Min. / 10-5 Int. Avg.
Blocking Range	200 nm-Cut On λ	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-On Wavelength (Range)	501 – 700 nm

Long Pass Filter Specifications | LP-650-25

Cut-On Wavelength	650 nm	Cut-On Tolerance	±3 nm
Transmission Region	Cut-on λ to 2.2 µ minimum	Minimum Peak Transmission	80%
Slope (OD 0.3 to 4.0)	3%	Blocking	10-4 Int. Min. / 10-5 Int. Avg.
Blocking Range	200 nm-Cut On λ	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-On Wavelength (Range)	501 – 700 nm

Long Pass Filter Specifications | LP-700-25

Cut-On Wavelength	700 nm	Cut-On Tolerance	±3 nm
Transmission Region	Cut-on λ to 2.2 µ minimum	Minimum Peak Transmission	80%
Slope (OD 0.3 to 4.0)	3%	Blocking	10-4 Int. Min. / 10-5 Int. Avg.
Blocking Range	200 nm-Cut On λ	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-On Wavelength (Range)	501 – 700 nm

Long Pass Filter Specifications | LP-750-25

Cut-On Wavelength	750 nm	Cut-On Tolerance	±3 nm
Transmission Region	Cut-on λ to 2.2 µ minimum	Minimum Peak Transmission	75%
Slope (OD 0.3 to 4.0)	3%	Blocking	10-4 Int. Min. / 10-5 Int. Avg.
Blocking Range	200 nm-Cut On λ	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-On Wavelength (Range)	701 – 900 nm

Long Pass Filter Specifications | LP-800-25

Cut-On Wavelength	800 nm	Cut-On Tolerance	±15 nm
Transmission Region	Cut-on λ to 2.2 µ minimum	Minimum Peak Transmission	75%
Slope (OD 0.3 to 4.0)	3%	Blocking	10-4 Int. Min. / 10-5 Int. Avg.
Blocking Range	200 nm-Cut On λ	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-On Wavelength (Range)	701 – 900 nm

Long Pass Filter Specifications | LP-850-25

Cut-On Wavelength	850 nm	Cut-On Tolerance	±15 nm
Transmission Region	Cut-on λ to 2.2 µ minimum	Minimum Peak Transmission	75%
Slope (OD 0.3 to 4.0)	3%	Blocking	10-4 Int. Min. / 10-5 Int. Avg.
Blocking Range	200 nm-Cut On λ	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-On Wavelength (Range)	701 – 900 nm

Long Pass Filter Specifications | LP-900-25

Cut-On Wavelength	900 nm	Cut-On Tolerance	±15 nm
Transmission Region	Cut-on λ to 2.2 µ minimum	Minimum Peak Transmission	75%
Slope (OD 0.3 to 4.0)	3%	Blocking	10-4 Int. Min. / 10-5 Int. Avg.
Blocking Range	200 nm-Cut On λ	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-On Wavelength (Range)	701 – 900 nm

Long Pass Filter Specifications | LP-950-25

Cut-On Wavelength	950 nm	Cut-On Tolerance	±15 nm
Transmission Region	Cut-on λ to 2.2 µ minimum	Minimum Peak Transmission	75%
Slope (OD 0.3 to 4.0)	3%	Blocking	10-4 Int. Min. / 10-5 Int. Avg.
Blocking Range	200 nm-Cut On λ	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-On Wavelength (Range)	901 – 1100 nm

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