INDUSTRY COMPONENT

Optical Filter

Optical filter selectively transmits specific wavelengths while blocking others in phototherapy devices.

Component Specifications

Definition
An optical filter is a precision optical component designed to selectively transmit or block specific wavelengths of light in the visible and near-infrared spectrum. In portable home phototherapy devices, it precisely controls the spectral output to ensure therapeutic wavelengths (typically 400-500nm for neonatal jaundice treatment) are delivered while filtering out potentially harmful UV and infrared radiation. The filter maintains consistent optical performance across temperature variations and device orientations.
Working Principle
Operates through interference or absorption mechanisms. Interference filters use thin-film coatings to create constructive/destructive interference for specific wavelengths, while absorption filters utilize dyed glass or plastic materials that absorb unwanted wavelengths. The filter precisely separates therapeutic blue light (peak ~450nm) from other spectral components.
Materials
Optical glass substrate (BK7, fused silica) with dielectric thin-film coatings (TiO2, SiO2, MgF2) or colored optical polymers (PMMA, polycarbonate) with UV stabilizers. Coating thickness: 100-500nm per layer with 10-50 layers total.
Technical Parameters
ParameterTypical rangeNotes & selection driver
Diameter25.4±0.1mm
Thickness2.0±0.2mm
Blocking Range<1% transmission at 300-400nm & 500-700nm
Surface Quality60-40 scratch-dig
Bandwidth (FWHM)30±5nm
Angular Tolerance±2°
Center Wavelength450±5nm
Peak Transmission>85%
Operating Temperature-10°C to +60°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards
ISO 10110, ISO 14997, DIN 3140, DIN 58196

Parent Products

This component is used in the following industrial products

Engineering Analysis

Risks & Mitigation
  • Wavelength drift over time
  • Coating delamination
  • Surface contamination reducing transmission
  • Thermal damage from prolonged exposure
  • Mechanical cracking from improper handling
FMEA Triads
Trigger: Coating degradation from UV exposure
Failure: Reduced transmission efficiency below 70%
Mitigation: Implement UV-blocking pre-filters and scheduled replacement intervals (every 2 years or 2000 hours)
Trigger: Thermal expansion mismatch between layers
Failure: Wavelength shift exceeding ±10nm
Mitigation: Use materials with matched CTE and thermal cycling testing from -20°C to +80°C

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance
Wavelength: ±2nm, Transmission: ±3%, Dimensions: ±0.1mm
Test Method
Spectrophotometry (ISO 13695), Environmental testing (IEC 60601-1), Biocompatibility (ISO 10993)

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation
Request current drawings, revision history, and a signed specification sheet.
Manufacturing capability
Verify equipment lists, process limits, capacity, and representative production evidence.
Inspection readiness
Confirm test methods, calibrated equipment, sampling plans, and traceable reports.
Supplier transparency
Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Optical Filter

2 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

ECOPTIK
Shenzhen, Guangdong, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Fuzhou Alpha Optics
Fujian, CN
Listed on the company's own website · profile compiled by CNFX from public sources

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

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Frequently Asked Questions

Why is wavelength precision critical in phototherapy filters?

Therapeutic effectiveness depends on delivering specific wavelengths (450nm for bilirubin breakdown) while blocking harmful UV/IR radiation. Even 10nm deviation can reduce treatment efficacy by 30% or cause skin damage.

How do environmental factors affect filter performance?

Temperature changes cause wavelength shifts (~0.02nm/°C), humidity affects coating adhesion, and mechanical stress alters optical path. Medical-grade filters include compensation coatings and robust sealing.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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