Added a 'near-infrared bandpass filter wavelength: 940nm' to the expert coating.

A bandpass filter is a filter that enables selective transmission of light for various applications, allowing for the selective exclusion of light at other wavelengths. Based on its proven performance in visible light, it is also optimal for applications requiring delicate light, such as photoelectric sensors (TOF sensors) and LiDAR, by controlling the film formation in the infrared range (940 nm).
◆◆ Are you facing any of these issues?
- I want to allow only a specific wavelength in the near-infrared range (940 nm); is that possible?
- I would like to use a bandpass filter adapted to the wavelengths of near-infrared LEDs or lasers.
- I want to widen the stopband because any light other than the desired wavelength becomes noise.
- Can you take into account the range of incident angles?
- I've heard it's used in communication devices; does it have any specific features?

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