1. Material & Construction

• Optical Substrates:

  • UV Filters: UV-grade fused silica (180–400nm transmission)

  • IR Filters: Colored glass (Schott RG-type) or coated BK7 (700–1200nm range)

• Coatings: Hardened dielectric layers for bandpass/blocking (OD >6 rejection)

• Custom Formats: Round, rectangular, or complex shapes (3–200mm diameter)

2. Key Properties

• Precision Spectral Control:

  • UV Pass/Block: >95% transmission @ target band ±5nm tolerance

  • IR Cut: Sharp transition slopes (e.g., 650nm cut-on @ ±10nm)

• Environmental Durability:

  • Thermal shock resistance: ΔT >150°C

  • Humidity resistance: 95% RH @ 85°C

• Optical Integrity:

  • Surface flatness: λ/2 @ 633nm

  • Scratch resistance: 80-50 scratch-dig standard

3. Core Functions

• Spectral Purity: Blocks unwanted UV/IR to enhance image accuracy

• Sensor Protection: Shields CMOS/CCD from IR/UV degradation

• Signal Optimization: Increases SNR in machine vision by eliminating ambient IR/UV noise

• Color Fidelity: Prevents IR contamination in RGB imaging

4. Applications

• Imaging Systems:

  • Security cameras (IR-cut for day/night switching)

  • Medical endoscopes (UV-blocking for tissue imaging)

• Industrial Sensors:

  • LiDAR receivers (850nm bandpass filters)

  • Spectroscopy (custom bandpass for gas detection)

• Automotive:

  • In-cabin monitoring sensors (IR-pass for eye tracking)

  • Autonomous vehicle LiDAR (905nm filters)