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OEM Longpass Fused Silica Filter, AR & ITO Coating, 90% Transmittance High Durability Laser Protection Filter

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Categories	Longpass Shortpass Filters
Brand	FELIX GLASS optical glass Manufacturing base
Model	FG-LP-FS-AR-ITO
Substrate Materia	High purity JGS1 bubble-free fused silica quartz glass
Functional Coating	Dual-layer broadband AR anti-reflection + transparent conductive ITO coating, target band transmitta
Customizable Parameter	Custom square/round outline, thickness, arbitrary longpass cut-off wavelength
Core Performance	Anti-static, scratch-resistant, acid-alkali resistant, stable under long-term laser irradiation
FOB port	SHENGZHEN SHANGHAI GUANGZHOU
Terms of Payment	L/C, D/A, D/P, Western Union
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OEM Longpass Fused Silica Quartz Filter With AR & ITO Composite Coating For Laser Protection

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.

Core Optical Specifications

- 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

Core Product Advantages

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

Typical Application Scenarios

- 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

OEM Manufacturing Capability

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.

Standard FAQ

1. What are the functions of AR coating and ITO coating respectively?

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

2. What is longpass filter used for in laser equipment?

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.

3. Can I customize cut-off wavelength and filter size for laser protection?

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

4. Why choose fused silica instead of BK7 glass for laser filter?

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

5. Do you provide OEM customized coating parameters for ITO AR longpass filters?

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

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What is your MOQ for custom optical glass and display glass parts?: Felix Glass offers highly flexible MOQ to support client projects, including prototype testing, small batch trial orders and large-volume mass production. All products can be fully customized according to your drawings, tolerances and application standards. Send us your specs to get an accurate price quote within 24 hours.

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What is the production lead time for custom optical glass components?: What is the production lead time for custom optical glass components?
Answer: The lead time for standard samples is 3–7 business days, while mass production takes 15–25 business days, depending on product complexity and order volume. We provide reliable, rapid delivery for orders serving the industrial, medical, automotive, and aerospace sectors. Please submit your project details to receive an accurate delivery schedule.

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Do you offer one-stop custom optical glass processing services?: Yes. We provide a full range of in-house processing services, including CNC machining, precision grinding, optical polishing, vacuum coating (AR, AF, AG, IR), tempering, and screen printing. Every step—from raw material to finished product—is carried out within our own facility. Please let us know your requirements, and we will provide you with the most cost-effective solution.