Parameter	Typical Value/Range	Description
CWL	Customized on request (typically 0.7μm-14μm)	The wavelength point with the highest transmittance needs to be matched to the detector or light source.
FWHM	0.1μm - 5μm	Narrow bands (e.g., 0.1 μm) are used for laser or spectral analysis, and broad bands (e.g., 3-5 μm) are used for thermal imaging.
Tpeak	70% - 95%	LWIR transmittance is usually low (~80%) due to material absorption and coating process.
OD	OD3 - OD6 (T<0.1%)	The ability to block non-target bands such as visible (OD4) or adjacent infrared bands (OD3).
AOI	0° (vertical incidence optimal)	Large angle incidence may result in wavelength shifts (e.g. 1-2 μm CWL shift at 30° incidence).

What types of infrared bandpass filters (by wavelength) are available from Yutai Optics?
Short Wave Infrared (SWIR, 0.7-2.5μm)
Typical applications: night vision, semiconductor detection(e.g. InGaAs detectors with 1.55μm filters).
Materials: Si, fused silica, coated materials (SiO₂/Ta₂O₅).

Mid-wave infrared (MWIR, 3-5μm)
Typical applications: missile guidance, gas detection (e.g. CO₂ 4.26μm absorption peak).
Materials: Ge, ZnSe, Si, coated materials (YF₃/ZnS).

Long Wave Infrared (LWIR, 8-14μm)
Typical applications: thermal imaging (peak body radiation ~10μm), weather monitoring.
Materials: Ge, Si, ZnSe, coated materials (ThF₄/Ge).