GDTB bandpass filter
Bandpass filter has a wide bandwidth
Glass with obvious cutoff at short wave and long wave
Their spectral characteristics
From the maximum value of transmissivity (TM)
And its wavelength（ λ M) Location
Short wave cutoff wavelength
Long wave cutoff wavelength
And half band degree
Application of Broadband Filter
In the practical application of optical engineering
Not all places need band-pass filters
All hope that the narrower the passband, the better
There is also a need for broadband filters
For example, automatic dimming mask for welding protection
It is required to use a piece that is transparent to visible light
Bandpass filter for UV and IR depth cutoff
Application of Narrow Band Filter
For a long time, F-P interference type membrane
As the only way to obtain narrowband pass filter
It is widely used in optical waveband
DWDM in optical fiber communication in recent years
Dense wavelength division multiplexer technology
Using F-P interference optical ultra narrow band filter
Expand the channel capacity of a single fiber
Application of optical ultra narrow band filter
And manufacturing technology to a new level
Common indicators of Narrow Band Filter
Material Colored optical glass
Surface quality 60-40 or better
Areal accuracy λ/ 2 or higher
Peak transmittance 20%~65% (standard conditions)
Dimension tolerance ± 0.1mm
Thickness tolerance ± 0.05mm
