Band-pass filter

Infrared bandpass filters have the following characteristics: 1. Selective transmission: They allow only specific infrared wavelength bands to pass through while effectively blocking other wavelengths, enabling spectral selection. 2. High transmittance: Within the passband, they typically achieve a transmittance of over 80%, with some high-performance products reaching 90% or even higher, ensuring signal strength. 3. High cutoff depth: They possess strong blocking capability for non-passband light in the cutoff region, with cutoff depths reaching OD3-OD6 or more, effectively suppressing interfering light. 4. Narrow or wide bandwidth options: They can be designed as narrowband (e.g., several nanometers bandwidth) or wideband (e.g., hundreds of nanometers bandwidth) based on requirements, adapting to different application scenarios. 5. Good stability: Made from high-quality substrates (such as germanium, silicon, sapphire, etc.) and using advanced coating processes, they offer good temperature stability, mechanical strength, and resistance to environmental interference. 6. Strong customization capability: Parameters such as center wavelength, bandwidth