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IRpass filters
IR-Pass Filters / Infrared Transmitting Optics (Cold Mirrors & IR Filters)
IR-pass filters (commonly referred to as infrared bandpass filters, NIR transmitting optics, or dark glass infrared filters) are optical elements engineered to block ultraviolet and visible light ($300\text{ nm} - 700\text{ nm}$) while transmitting targeted near-infrared, short-wave, or long-wave infrared wavelengths ($750\text{ nm} - 1100\text{ nm}+$)
Type 1 (Thin-Film Dielectric Coatings):
Precision interference filters featuring 30 to 50 dielectric thin-film layers vacuum-deposited via PVD-EBGE on optical glass substrates. They offer sharp spectral edge turn-ons, customizable passbands (e.g., 850 nm, 940 nm), and high peak IR transmission ($T \ge 90\%–95\%$) with deep visible light attenuation (OD3–OD5+).
Type 2 (Absorptive Optical Glass Filters):
Manufactured from specialized infrared-transmitting black glass formulations (e.g., HOYA RM/IR series). They utilize bulk material matrix absorption to eliminate ambient visible interference across wide angles of incidence (AOI) with zero angle-dependent wavelength shifting.
Applications:
LiDAR sensors
Remote sensing devices
Biometric facial/iris recognition
850 nm / 940 nm LED illuminators
Infrared night-vision surveillance systems
Automated Optical Inspection (AOI) machine vision
#IR970C #IR720H #IR760H
#IR850H #IR1020H #Information and Notes
ITEM NO: IR700C
Spectral Characteristics
T50%=700 +/-15nm
Tave>80% @ 750-1000nm
Tave<3% @ 430-650nm
Physical Characteristics
Glass: 0.7, 1.1mm
Borosilicate: 1.1, 2.0, 3.0mm
Square: 3x3 - 310x320mm
Round: Dia3 - 300mm
Resistant Temperature
Glass: 150℃
Borosilicate: 450℃
ITEM NO: IR800C
Spectral Characteristics
T50%=800 +/-15nm
Tave>88% @ 850-1100nm
Tave<3% @ 430-750nm
Physical Characteristics
Glass: 0.7, 1.1mm
Borosilicate: 1.1, 2.0, 3.0mm
Square: 3x3 - 310x320mm
Round: Dia3 - 300mm
Resistant Temperature
Glass: 150℃
Borosilicate: 450℃
ITEM NO: IR900C
Spectral Characteristics
T50%=900 +/-15nm
Tave>88% @ 930-1100nm
Tave<3% @ 410-830nm
Physical Characteristics
Glass: 0.7, 1.1mm
Borosilicate: 1.1, 2.0, 3.0mm
Square: 3x3 - 310x320mm
Round: Dia3 - 300mm
Resistant Temperature
Glass: 150℃
Borosilicate: 450℃
ITEM NO: IR970C
Spectral Characteristics
T50%=970 +/-15nm
Tave>88% @ 1000-1100nm
Tave<3% @ 750-930nm
Physical Characteristics
Glass: 0.7, 1.1mm
Borosilicate: 1.1, 2.0, 3.0mm
Square: 3x3 - 310x320mm
Round: Dia3 - 300mm
Resistant Temperature
Glass: 150℃
Borosilicate: 450℃
ITEM NO: IR720H
Spectral Characteristics
T50%=720 +/-15nm
Tave>80% @ 770-2000nm
Tave<2% @ 200-660nm
Physical Characteristics
Glass filters: 1~4mm
*The spectral curve varies with the thickness of glass.
Square: 5x5 - 150x150mm
Round: Dia5 - 150mm
Resistant Temperature
Glass: 150℃
Borosilicate: 450℃
ITEM NO: IR760H
Spectral Characteristics
Tave>80% @ 810-2000nm
Tave<2% @ 200-700nm
Physical Characteristics
Glass filters: 1~4mm
*The spectral curve varies with the thickness of glass.
Square: 5x5 - 150x150mm
Round: Dia5 - 150mm
Resistant Temperature
Glass: 150℃
Borosilicate: 450℃
ITEM NO: IR780H
Spectral Characteristics
Tave>80% @ 830-2000nm
Tave<2% @ 200-720nm
Physical Characteristics
Glass filters: 1~4mm
*The spectral curve varies with the thickness of glass.
Square: 5x5 - 150x150mm
Round: Dia5 - 150mm
Resistant Temperature
Glass: 150℃
Borosilicate: 450℃
ITEM NO: IR850H
Spectral Characteristics
Tave>80% @ 900-2000nm
Tave<3% @ 200-790nm
Physical Characteristics
Glass filters: 1~4mm
*The spectral curve varies with the thickness of glass.
Square: 5x5 - 150x150mm
Round: Dia5 - 150mm
Resistant Temperature
Glass: 150℃
Borosilicate: 450℃
ITEM NO: IR1020H
Spectral Characteristics
Tave>50% @ 1000-2000nm
Tave<2% @ 200-800nm
Physical Characteristics
Glass filters: 1~4mm
*The spectral curve varies with the thickness of glass.
Square: 5x5 - 150x150mm
Round: Dia5 - 150mm
Resistant Temperature
Glass: 150℃
Borosilicate: 450℃
Information and Notes
1. IR-pass cold mirror filters (including IR700C, IR900C, and IR970C) feature precision thin-film dielectric interference coatings comprising 40 to 52 layers vacuum-deposited on optical glass substrates.
2. Optional second-surface multi-layer Anti-Reflection (AR) coating is available to suppress Fresnel reflection from ~4% down to <0.5%, significantly reducing secondary ghost images, glare, and internal reflections.
3. Vacuum thin-film depositions are executed using Physical Vapor Deposition with Electron Beam Gun Evaporation (PVD-EBGE) technology, ensuring exceptional coating density, high thermal resistance, and environmental durability.
4. Spectral transmittance curves for cold mirror series represent physical sample measurements captured at a 45° angle of incidence (AOI).
5. Transmittance curves reflect actual physical sample measurement data and are subject to minor manufacturing tolerances between production lots while strictly conforming to target engineering optical specifications.
6. IR-pass absorptive glass filters (including IR720H, IR760H, IR780H, and IR850H) utilize bulk glass matrix absorption to block ultraviolet and visible light while transmitting near-infrared wavelengths.
7. Spectral curves for glass filter series represent actual physical spectrophotometer measurements under production batch quality control.
8. Absorptive optical glass components are generically referred to as "colored glass filters," "optical colored glass," or "color filters."
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