BP1535-20 대역 통과 필터(CWL=1535nm, FWHM=20nm)

SWIR Imaging & Active Night Vision

• Used in SWIR cameras to detect active illumination (laser designators or beacons) while rejecting ambient light.

Recommended Light Sources

• Er:Glass Laser

Wavelength Match: These solid-state lasers naturally emit at exactly 1535 nm, which aligns perfectly with the center wavelength of your BP1535-20 filter. This ensures maximum signal transmission through the filter while ambient light is blocked.

• 1535 nm Laser Diode

Application: For smaller, portable "beacons" (worn on helmets or vehicles) that do not require the extreme range of a designator, a semiconductor laser diode tuned to 1535 nm is often used.

Eye-Safe Laser Rangefinding

• The 1535 nm wavelength is the industry standard for eye-safe laser rangefinders (LRF) and LIDAR systems used in military and outdoor commercial applications. Unlike 1064 nm lasers, 1535 nm is absorbed by the fluid in the eye before reaching the retina, making it much safer for human vision at higher power levels.
• The filter is used in the receiver to block sunlight and other background noise, allowing the sensor to detect the weak reflected laser pulse.

Recommended Light Sources

• Er:Glass Solid-State Laser

1. Wavelength Precision: These lasers rely on an Erbium-doped phosphate glass gain medium, which naturally emits light at 1535 nm. This perfectly matches the center wavelength of your BP1535-20 filter, ensuring the receiver captures the maximum amount of signal.
2. High Peak Power (Q-Switching): Er:Glass lasers are typically "Q-switched" (often using a passive Co:Spinel crystal). This allows them to store energy and release it in incredibly short, high-intensity pulses (lasting just a few nanoseconds). This high peak power is essential for the "Time-of-Flight" calculations used to measure long distances accurately.