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 specifications are available upon request.
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