Long Wave Pass Filter

Long pass filter Description

Long wave Pass Filter, or call Long pass filter, it is a filter in which the pass band is a wavelength range higher than the wavelength range that is blocked. Long pass filters pass all wavelengths longer than the cut off wavelength. Long pass filters include cold mirrors, colored glass filters, and thermo set ADC (optical cast plastic) filters.
Long-wave pass filter is thin plate plates with long/pass-wave pass coating on one side, the other side is AR coating.

Difference between long pass filter, short pass filter, dichroic filter and IR/UV cut Filter

Long pass Filters is one of the cut-off filters, it can transmit wavelengths greater than the cut-on wavelength, while Shortpass Filters transmit wave-  lengths shorter than the cut-off wavelength. Dichroic filters perform the same function, while guaranteeing that the  rejected wavelengths are reflected. Any of these filters can be designed for 0  or 45  angle of incidence. Edge and Di- chroic Filters are commonly used in Fluorescence instrumentation, Heat Rejection Applications, and as Color Filters.  While somewhat angle sensitive, they are more forgiving than bandpass interference filters.

Long pass filter Applications

● Beauty equipment
● Face recognition
● optical instrument
● Multi band detection instrument

Shape Optics Long Pass Filter Products

● Material:BK7
● Transmission:>90%
● Blocking:＞OD4
● Incidence Angle:0°or 45°
● Surface Quality:40/20
● Clear Aperture:>90%
● Wavelength shift with temperature：<0.25nm/℃
● Damage threshold:300MW/cm²CW, 1J/cm²pulsed
● Other wavelengths ，materials and dimensions are available upon request
● Long- Pass Filters