Thermal Sink/Heat Spreader: Fin Height 10-50 mm

Component Specifications

Definition

A thermal management component in laser diode assemblies designed to absorb and dissipate heat generated by the laser diode during operation. It typically consists of a heat spreader that distributes heat evenly from the diode junction and a thermal sink that transfers heat to the surrounding environment through conduction, convection, or radiation. This component is critical for maintaining the diode's temperature within specified limits to ensure stable output power, wavelength accuracy, and extended operational lifespan.

Working Principle

Operates on the principles of thermal conduction and convection. The heat spreader, often made of high-thermal-conductivity materials, absorbs heat from the laser diode's active region and distributes it across a larger surface area. The thermal sink then transfers this heat to the ambient air or a cooling system, utilizing fins or other structures to enhance surface area for efficient heat dissipation. In some designs, phase-change materials or heat pipes may be integrated for improved thermal performance.

Materials

Common materials include aluminum alloys (e.g., 6061, 6063) for lightweight and cost-effective solutions, copper (C11000) for superior thermal conductivity, and advanced composites like aluminum silicon carbide (AlSiC) or diamond-copper for high-power applications. Thermal interface materials (TIMs) such as thermal grease, pads, or phase-change materials are used at the interface between the diode and heat spreader to minimize thermal resistance.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Fin Height	10-50 mm
Surface Finish	Anodized or nickel-plated for corrosion resistance
Mounting Method	Screw, clip, or adhesive bonding
Thermal Resistance	0.1-5.0 °C/W
Base Plate Thickness	3-10 mm
Operating Temperature Range	-40 to +150 °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 22007, DIN EN 60747-5

Parent Products

This component is used in the following industrial products

Laser Diode Assembly

A precision optical assembly containing a laser diode and associated components for generating and directing coherent light.

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Engineering Analysis

Risks & Mitigation

Thermal runaway due to inadequate heat dissipation
Corrosion in humid environments
Mechanical fatigue from thermal cycling
Poor thermal interface leading to hotspots

FMEA Triads

Trigger: Insufficient thermal design or material selection
Failure: Laser diode overheating, causing wavelength shift, power drop, or catastrophic failure
Mitigation: Conduct thermal simulation during design, use high-conductivity materials, and implement redundant cooling or temperature monitoring systems

Trigger: Degradation of thermal interface material (TIM)
Failure: Increased thermal resistance, reduced heat transfer efficiency
Mitigation: Use reliable TIMs with long-term stability, apply proper mounting pressure, and schedule periodic maintenance or replacement

Trigger: Environmental contamination or corrosion
Failure: Reduced surface efficiency or structural integrity of the thermal sink
Mitigation: Apply protective coatings (e.g., anodization, plating), ensure clean operating environments, and use corrosion-resistant materials

Industrial Ecosystem

Compatible With

Laser diode assemblies, fiber laser systems, optical communication equipment, medical laser devices

Typical Suppliers & Equivalents

Fischer Elektronik, Aavid Thermalloy, Wakefield-Vette, Cooler Master, Alpha Novatech

Compliance & Inspection

Tolerance

Dimensional tolerances per ISO 2768-m, flatness within 0.05 mm per 25 mm, surface roughness Ra ≤ 1.6 μm

Test Method

Thermal performance tested per ISO 22007 for thermal conductivity, infrared thermography for hotspot detection, and environmental testing per IEC 60068 for corrosion and thermal cycling resistance

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.

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Manufacturers of Thermal Sink/Heat Spreader

Manufacturer profiles associated with Thermal Sink/Heat Spreader.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the difference between a thermal sink and a heat spreader?

A heat spreader distributes heat from a small source (like a laser diode) over a larger area, while a thermal sink dissipates that heat into the environment. In laser diode assemblies, they often work together as an integrated component.

How do I select the right material for a thermal sink?

Choose based on thermal conductivity, weight, cost, and application requirements. Aluminum is common for general use, copper for high performance, and composites like AlSiC for specialized high-power or weight-sensitive applications.

What are common failure modes in thermal sinks?

Key failures include thermal interface degradation, corrosion, mechanical loosening, and insufficient cooling due to design flaws or environmental factors, leading to diode overheating and failure.

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.

Thermal Sink/Heat Spreader