Introduction of our bandpass filter (BPF) Part II
Bandpass filter (BPF) is an optical component which transmits arbitrary wavelengths and blocks other wavelengths.
It removes noises of optical sensor, image processing, and detector as a optical receiver.
We provide high-precision filter function with our leading thin-film technology.
Followings are the introduction of our BPF (near-infrared ～ mid-infrared ～ far-infrared).
■Near-infrared BPF for communications (λ = 1,064nm / 1,550nm)
The Wavelength of 1,550nm, at which light loss of optical fiber for communications can be minimized, is selected to reduce transmission loss of long-distance communications.
Also, central wavelength of Nd:YAG laser is 1,064nm, which is most commonly applied for medical, industrial, and R&D use.
■Mid-infrared BPF (λ = 2.75μm / 3.3μm / 4.25μm/ 4.75μm)
It is a BPF in mid-infrared range (2.5～4μm level).
Carbon dioxide (CO2) has its absorption spectrum at 2,349cm-1(4.25μm）, while methane (CH4) has at 3,300cm-1(3.3μm).
Specific wavelength can be transmitted effectively by using BPF.
It is possible to apply water and oil repellent coating to infrared lens of heat detector sensor installed at an outdoor or in a factory line.
■Far-infrared BPF
It is used for sensing the heat including human body temperature.
Since this BPF can check the temperature distribution of land surface and cloud from a satellite or an airplane, it becomes an essential technology to research on global warming, too.
Besides being observable during nighttime, it has the advantage that less affected by the noise of the air because wavelength is longer than visible light.
Please feel free to contact us for any questions.
