OEM longpass fused silica filter AR & ITO Coating, High Durability Laser Protection Filter

 

Felix Glass OEM longpass optical filter adopts high-purity JGS1 fused silica quartz as substrate, processed with double-sided composite vacuum coating: broadband AR anti-reflection film + conductive ITO transparent film, integrating long-wave cut-off filtering, high light transmittance, static elimination and laser protection functions.

 

Longpass optical design blocks short-wave light below customized cut-off wavelength and stably transmits long-wave target band, the composite AR+ITO coating ensures the transmittance of target spectrum reaches above 90%. ITO conductive layer eliminates static accumulation on the filter surface to avoid dust adsorption and laser beam distortion; AR coating reduces surface reflection loss and suppresses stray light interference. Fused silica substrate features ultra-low thermal expansion and high scratch resistance, achieving ultra-high durability for long-time continuous laser equipment operation.

 

 

- Raw Material: Bubble-free high purity JGS1 fused silica quartz glass

- Filter Type: Longpass wavelength cut-off filter, customizable cut-off point

- Composite Coating: Broadband AR anti-reflection coating + transparent conductive ITO coating

- Target Band Transmittance: ≥90%

- Blocking Depth: OD2~OD6 customizable for short-wave rejection

- Working Spectrum: 185nm–2100nm deep UV to near infrared

- Surface Quality: Standard 60-40 scratch-dig, upgradeable to high precision 40-20

- Durability: Acid & alkali resistant, anti-scratch, anti-static, stable under long-term laser irradiation

- Custom Parameter: Custom square/round size, thickness, cut-off wavelength

 

 

1. AR+ITO dual functional composite coating, realize anti-reflection high transmittance and static elimination conductive performance at the same time

2. Longpass filtering function, customizable cut-off wavelength to filter stray short-wave light and protect laser internal optical elements

3. ≥90% transmittance in working band, reduce laser energy loss and improve equipment output efficiency

4. Fused silica quartz substrate with ultra-high temperature resistance and stable performance, far more durable than ordinary K9 glass filters

5. OEM full customization support: shape, size, cut-off wavelength, coating parameters all adjustable according to customer laser system drawings

6. Anti-static ITO layer prevents dust adhesion, reduce equipment maintenance frequency and extend service life

 

 

- Industrial fiber laser, UV laser marking & cutting machine protection windows

- Laboratory UV-Vis-NIR spectral analysis optical instruments

- Semiconductor wafer detection optical filter modules

- Machine vision long-wave imaging detection equipment

- Medical laser diagnosis & beauty laser safety protection assemblies

- Optical testing equipment anti-stray-light filtering windows

 

We provide full one-stop fused silica filter processing including quartz blank double-sided polishing, vacuum AR+ITO composite coating deposition, wavelength spectral testing, laser durability aging test, edge chamfer treatment.

Prototype sample customization, small-batch trial order and mass OEM supply are supported. Every longpass quartz filter is fully tested for transmittance, blocking depth and coating adhesion before delivery.

 

 

AR coating reduces surface reflection to raise light transmittance; ITO conductive coating eliminates static electricity to prevent dust adsorption and laser beam distortion.

It blocks short-wave stray light below the cut-off wavelength, only transmits the required long-wave laser band, protects internal optical lenses and sensors from stray light damage.

Yes, we support custom square/round dimensions, thickness, and arbitrary longpass cut-off wavelength matched to UV, visible or near-infrared laser equipment.

Fused silica transmits deep UV light, high temperature resistant, low thermal expansion, no deformation under long-time laser irradiation, better durability than BK7 glass.

We support OEM custom coating sheet resistance, AR band range and light blocking depth, provide complete spectral test report for each batch