Advanced IR-Transmitting Glass Solutions for Optical Applications

Infrared-transmitting Glass enables critical functionalities across touchscreens, security systems, AR/VR devices, and thermal imaging. As a glass processing specialist, selecting the optimal IR-transmission technology depends on spectral requirements, environmental durability, and application-specific optical performance. Below we detail three core implementation approaches.

1. IR Ink Printing (Selective IR Transmission)

Technology Principle: Screen-printing or digital printing of infrared-transparent inks creates patterned areas that transmit IR while blocking visible light. These inks contain IR-permeable pigments (e.g., copper-based compounds) formulated for minimal visible-light leakage.

Key Parameters & Applications:

2. High-Transmission IR Black Glass (Full-Substrate IR Optimization)

Technology Principle: Ultralow iron (Fe₂O₃ < 200 ppm) and redox control (Fe²⁺/Total Fe < 20%) minimize NIR absorption. Doping with Cr₂O₃ (3–75 ppm) or MnO (50–1000 ppm) further enhances IR transparency while neutralizing green/yellow tints .

Performance Highlights:

Spectral Range: 750–2500 nm (FTIR touchscreens) 

Critical Metrics: IR light transmittance ＞90%

Applications:

Large-format touchscreens: Utilizes frustrated total internal reflection (FTIR) with edge-mounted IR sensors . 

AR waveguide substrates: Combines high IR transmission (>92%) with flatness tolerances <0.5 μm/cm² for distortion-free imaging 

3. Thin-Film Coating (IR Reflection/Transmission Tuning)

Technology Principle: Vacuum deposition (sputtering, evaporation) applies functional layers:

IR-pass filters: Dielectric stacks reflecting VIS while transmitting IR.

Coating Performance Comparison:

Applications:

Energy-efficient glazing: VO₂ coatings reduce building cooling loads via adaptive IR reflection. 

ITO-coated IR windows: Enable defogging/anti-static functions in medical devices .

Implementation Comparison & Selection Guide