638nm long wave pass dichroic filter

The 638nm long wave pass dichroic mirror, beam splitter and dichroic filter provided by Borisun Optics divides the beam into transmitted light and reflected light according to the design wavelength. The long wave pass dichroic mirror has high reflectivity for beams below the cut-off wavelength and high transmittance for beams above the cut-off wavelength. We also provide a short wave through dichroic mirror, which has high transmittance for beams below the cut-off wavelength and high reflectivity for beams above the cut-off wavelength.

We provide long wave pass dichroic mirror and light combiner with a variety of medium wavelengths to choose from. Moreover, in the corresponding transmission and reflection bands, the absolute transmittance and absolute reflectivity are more than 85% and more than 90% respectively. They are designed for 45 ° incidence and have circular and square dimensions.

This optical element can be used to combine a beam whose wavelength (or wavelength range) is less than the cut-off wavelength with a beam whose wavelength (or wavelength range) is greater than the cut-off wavelength. Usually they are also used to separate the light superimposed by different color spaces. One surface of these optical elements is plated with dichroic film and the other surface is plated with antireflective film.

638nm dichroic filter
Technical parameters
Items Parameters
Product index customizable
Cut off wavelength 638nm
Transmission band 655nm-700nm
Average transmittance ≥88%
Reflection band 580nm-621nm
Average reflectivity ≥90%
Incident angle 45°
Surface quality 40-20
Film material dura mater
spectral curve

In addition, We can customize the optical filters according to customer requirements or drawings.

For details, please consult:

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