LPF400nm Long Wave Pass Filter

Long wave communicationoptical filter（Longpass Filters）， There are other names, such as high pass filter, long wave filter, long wave filter, long pass filter, etc. Of course, filter is a term used in the digital photography industry. Its optical characteristics are the same, that is, high transmittance of light in the long wave direction, while light in the relatively short wave direction is cut off. It belongs to a type of cut-off filter, which is used in optical precision instrumentsLong wave pass filterIts cut-off depth is more stringent than that of photographic filters, and its quality is also higher.

Ruicheng Optoelectronics' LPF400nm long wave pass filter has a peak transmittance of 50% at a wavelength of 400nm, with high transmittance from 405-1200nm (>90%) and complete cutoff from 200nm-395nm, with a cutoff depth of OD5. The measured spectral curve in the attachment shows that this filter has high steepness and high transmittance, and its advantages are very obvious compared to ordinary products on the market.

Technical Parameters:

Process: Ion vacuum hard film process;

Material: Schott BF33;

Effective wavelength range: 200-1200nm;

Incident angle: 0 degrees;

Peak transmittance (T peak):>90%;

Blocking depth: OD5;

Starting wavelength (lambda; cut on): 400nm;

Dimension: 60 * 60 * 0.55mm can be cut into circular or square shapes according to customer size requirements;

Surface quality: 40/20;

Surface parallelism:λ /4

Actual measured spectral curve: