Anti-reflective Coating Optical Glass Substrates For Inspection Systems

Material:

• Base Substrate: High-precision borosilicate glass (e.g., Borofloat 33) or fused silica, selected for exceptional flatness, thermal stability, and chemical resistance.

• Coating Technology: Multi-layer dielectric coatings (e.g., MgF₂, SiO₂, Ta₂O₅) applied via precision magnetron sputtering or vapor deposition.

• Design Types: Customizable as broadband AR (visible-NIR spectrum) or V-coating (single-wavelength optimization).

Key Properties:

1. Ultra-Low Reflectance: Achieves <0.5% surface reflectance (vs. 4-8% for uncoated glass), maximizing light throughput.

2. High Transmission Efficiency: Delivers >99.5% light transmission in target wavelengths, minimizing signal loss.

3. Angular Stability: Maintains performance across 0-45° incidence angles critical for oblique imaging.

4. Environmental Durability: Resists delamination, humidity, and UV degradation under continuous operation.

5. Surface Quality: Sub-Ångstrom roughness (<5Å Ra) prevents light scattering artifacts.

6. Thermal & Chemical Resilience: Withstands cleaning solvents and thermal cycling (-60°C to +300°C).

Primary Function:

• To eliminate stray reflections and maximize contrast in high-precision optical inspection systems.

• Minimizes ghost images and flare caused by surface reflections.

• Enhances signal-to-noise ratio for accurate defect detection.

• Preserves light intensity across complex optical paths.

Main Applications in Inspection Systems:

1. Semiconductor Metrology:

   • Wafer defect scanners

   • EUV lithography inspection optics

   • Mask alignment systems

2. Automated Optical Inspection (AOI):

   • PCB assembly verification

   • Display panel defect detection (OLED/LCD)

3. Biomedical Imaging:

   • Microscope objectives for pathology

   • Flow cytometry lenses

4. Industrial Vision Systems:

   • Laser triangulation sensors

   • Machine vision lenses for assembly lines

5. Aerospace NDT:

   • Ultrasonic probe windows

   • Endoscope optics for turbine inspection

6. Photonics Testing:

   • Optical interferometer plates

   • Spectrometer windows

In essence: Anti-reflective Coating Optical Glass Substrates are precision-engineered components that solve reflection-induced accuracy issues in critical inspection systems. By applying advanced multi-layer dielectric coatings to ultra-flat borosilicate or fused silica substrates, they achieve near-invisible surface performance (<0.5% reflectance), enabling defect detection at micron/sub-micron scales. These substrates directly enhance the reliability of semiconductor metrology, AOI equipment, and biomedical imaging tools where every photon matters.