Package Window: Diameter 3.0-10.0 mm, Thickness 0.5-2.0 mm

Q: What is the primary function of a package window in photodiode receivers?

The package window serves dual functions: transmitting target light wavelengths to the photodiode while providing hermetic sealing against environmental contaminants, moisture, and mechanical damage to ensure long-term reliability and consistent optical performance.

Q: How do anti-reflective coatings improve package window performance?

Anti-reflective coatings reduce surface reflections by up to 99%, increasing light transmission to the photodiode active area. This improves signal-to-noise ratio, enhances sensitivity, and minimizes stray light interference that could cause measurement errors in precision optical systems.

Component Specifications

Definition

A precision optical component integrated into photodiode receiver packaging that serves as a transparent interface between the external environment and the photosensitive semiconductor element. It maintains hermetic sealing while permitting specific wavelengths of light to reach the photodiode, protecting against contaminants, moisture, and mechanical damage while optimizing optical performance through anti-reflective coatings and precise geometric tolerances.

Working Principle

The package window operates on principles of optical transmission and environmental protection. It transmits incident photons within the photodiode's spectral response range (typically 400-1100nm for silicon photodiodes) while blocking harmful particles and moisture. Its optical properties are engineered to minimize reflection losses and maintain signal integrity through precise thickness control, surface flatness, and coating applications that enhance transmission efficiency.

Materials

Optical-grade fused silica (SiO₂) or borosilicate glass with anti-reflective coatings (MgF₂ or multilayer dielectric coatings). Alternative materials include sapphire (Al₂O₃) for extreme environments or optical polymers like polycarbonate for cost-sensitive applications. Material specifications include: transmission >90% at target wavelengths, thermal expansion coefficient matching packaging materials, and chemical resistance to cleaning agents.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Coating	Broadband AR coating (400-1100 nm)
Diameter	3.0-10.0 mm
Thickness	0.5-2.0 mm
Parallelism	<3 arc minutes
Scratch Dig	80-50 per MIL-PRF-13830B
Transmission	>90% @ 400-1100 nm
Surface Quality	40-20 scratch-dig
Surface Flatness	λ/4 at 632.8 nm

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, MIL-PRF-13830B

Parent Products

This component is used in the following industrial products

Photodiode Receiver

A semiconductor device that converts infrared light signals into electrical current within an optical port system.

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Engineering Analysis

Risks & Mitigation

Optical degradation from surface contamination
Mechanical failure due to thermal stress
Hermetic seal compromise leading to moisture ingress
Coating delamination under UV exposure

FMEA Triads

Trigger: Improper cleaning during installation
Failure: Surface contamination reducing light transmission
Mitigation: Implement cleanroom handling procedures and use specified optical cleaning solvents with lint-free wipes

Trigger: Thermal expansion mismatch between window and package
Failure: Cracking or seal failure during temperature cycling
Mitigation: Select materials with matched thermal expansion coefficients and implement gradual thermal cycling during manufacturing

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.1 mm diameter, ±0.05 mm thickness, surface flatness λ/4

Test Method

ISO 10110 optical testing, helium leak testing for hermeticity (<1×10⁻⁸ atm·cc/sec), spectral transmission measurement per ISO 13696

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

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Inspection readiness

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Supplier transparency

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Manufacturers of Package Window

Manufacturer profiles associated with Package Window.

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Frequently Asked Questions

What is the primary function of a package window in photodiode receivers?