Low incident angle dependence band pass fitlers
The transmission spectrum of band pass filters composed of multi-layered dielectric thin films subject to change depending on the incident angle of light. Usually, pass band slides to the shorter wavelength side by 20nm to 35nm when the incident angle changes from 0 degrees to 30 degrees. Low incident angle dependence band pass filters reduce this wavelength shift to less than a half and minimize the variation of the optical characteristics of the optical filter.
You can specify the center wavelengths of the low incident angle dependence band pass filters according to the laser wavelength applied to your system. Multi-band pass filters are available in case that the multiple laser wavelength are necessary at the same time.