Mine-to-Magnet Capability Tracker

Applications exposure screen

Material exposure in photonics and AI hardware.

Rare earths and adjacent critical materials often sit as small, performance-critical inputs in optics, lasers, semiconductor tools, power systems, and defense electronics. This screen maps public-source exposure by material family and domain.

8 input familiesPublic-source exposure screen

Caveat: Exposure screen. Presence and strategic relevance are public-source based; exact bill-of-material quantities are usually not disclosed.

01 Exposure matrix

Exposure intensity by material family and domain.

Each cell is a qualitative judgment of how central the material family is to that domain, derived from the per-row exposure mechanism and end-use text. Empty dashes mean the cell has not yet been assessed.

Exposure intensity
Core

Primary performance-limiting input in this domain.

Major

Common enabling input, though not universal across all systems.

Specific

Important in selected device classes, architectures, or components.

Indirect

Mainly present through supporting subsystems, tools, or materials.

Limited

Niche, episodic, or weakly evidenced relevance.

Rare-earth laser dopants and active fibers

Compute and memory
Limited
Optical links
Core
Sensing and imaging
Major
RF and power
Limited
Photonic integration
Specific
Thermal and motion
Limited

Rare-earth functional oxides, ceramics, and coatings

Compute and memory
Specific
Optical links
Major
Sensing and imaging
Specific
RF and power
Indirect
Photonic integration
Specific
Thermal and motion
Indirect

Rare-earth permanent magnets

Compute and memory
Indirect
Optical links
Indirect
Sensing and imaging
Indirect
RF and power
Major
Photonic integration
Limited
Thermal and motion
Core

Gallium compound semiconductors

Compute and memory
Specific
Optical links
Core
Sensing and imaging
Major
RF and power
Core
Photonic integration
Major
Thermal and motion
Limited

Indium compounds and transparent conductors

Compute and memory
Specific
Optical links
Major
Sensing and imaging
Major
RF and power
Specific
Photonic integration
Major
Thermal and motion
Limited

Germanium materials

Compute and memory
Major
Optical links
Major
Sensing and imaging
Core
RF and power
Specific
Photonic integration
Major
Thermal and motion
Limited

Electro-optic and dielectric oxide family

Compute and memory
Limited
Optical links
Core
Sensing and imaging
Specific
RF and power
Major
Photonic integration
Core
Thermal and motion
Limited

Tellurium-centered IR, acousto-optic, and radiation materials

Compute and memory
Limited
Optical links
Specific
Sensing and imaging
Major
RF and power
Limited
Photonic integration
Specific
Thermal and motion
Limited

02 Input families

Expanded notes on each material family.

Rows flag material families where supply concentration, export-control signaling, specialty processing, or qualification depth could be load-bearing. They do not assert universal use across all AI hardware.

Input family

Rare-earth laser dopants and active fibers

Small dopant quantities can sit inside high-value optical gain media; exposure is less about mass and more about purity, host compatibility, specialty fiber fabrication, and qualified supplier depth.

Evidence
secondary supported
Confidence
medium
Sources

3

Example materials
Yb-doped fiberEr-doped fiberNd:YAGTm- and Ho-doped gain media
End uses
  • Fiber lasers and amplifiers
  • Optical communications and sensing
  • Lidar, metrology, and directed-energy-adjacent photonics
China / export-control relevance

Rare-earth supply chains are exposed to Chinese mining, separation, and magnet-rare-earth concentration; export-control relevance is indirect unless a specific dopant, oxide, fiber, or technology transfer is controlled.

Caveat

This flags active-media dependence only. It does not estimate dopant mass, fiber preform sourcing, or laser-module supplier shares.

Claims
  • secondary supportedmediumfact

    Rare-earth ions such as ytterbium, erbium, neodymium, thulium, and holmium are used as active dopants in laser gain media and optical fibers for lasers and amplifiers.

Input family

Rare-earth functional oxides, ceramics, and coatings

The exposure is functional-material substitution risk: performance can depend on purity, particle morphology, coating process, and ceramic qualification rather than bulk rare-earth tonnage.

Evidence
secondary supported
Confidence
medium
Sources

2

Example materials
Y2O3CeO2Lu2O3YAG and rare-earth-doped glass ceramics
End uses
  • Laser ceramics and phosphors
  • Optical coatings and protective ceramics
  • Semiconductor-process chamber components and high-temperature functional materials
China / export-control relevance

China relevance is mainly upstream rare-earth oxide concentration and processing know-how; the export-control signal is weaker than for explicitly controlled gallium, germanium, indium, or tellurium items.

Caveat

This is a broad materials family. Product-level exposure depends on the exact oxide, coating stack, and qualified ceramic supplier.

Claims
  • secondary supportedmediumfact

    Rare-earth-doped glasses, ceramics, and oxides are used in optical materials, phosphors, laser ceramics, protective coatings, and other functional photonic materials.

Input family

Rare-earth permanent magnets

Exposure runs through motion, thermal-management, power-conversion, and precision-control subsystems around AI hardware, not only through the compute package itself.

Evidence
partially supported
Confidence
medium
Sources

3

Example materials
NdFeB magnetsDy- and Tb-containing high-coercivity magnet gradesPr-Nd alloy inputs
End uses
  • Data-center cooling and power systems
  • Robotics and precision motion
  • Actuators, pumps, fans, generators, and optical-positioning hardware
China / export-control relevance

High: China dominates refined magnet rare earths and sintered permanent magnet production, and rare-earth export controls can affect magnet-critical materials and downstream availability.

Caveat

This is a systems exposure signal. It is not a claim that every AI server or photonics module contains rare-earth magnets.

Claims
  • partially supportedmediuminterpretation

    NdFeB permanent magnets expose AI hardware and data-center infrastructure through motors, actuators, cooling systems, robotics, power equipment, and precision motion systems rather than only through chips.

Sources
Input family

Gallium compound semiconductors

Gallium exposure appears where III-V compound semiconductors enable speed, RF performance, power density, or optoelectronic conversion that silicon alone may not provide.

Evidence
primary confirmed
Confidence
high
Sources

2

Example materials
GaAsGaNGaPInGaAs and related III-Vs
End uses
  • RF power amplifiers and high-frequency electronics
  • Laser diodes, LEDs, photodetectors, and solar cells
  • Power electronics and optical interconnect-adjacent components
China / export-control relevance

High: China announced export controls on gallium-related items in 2023, and USGS identifies gallium use in GaAs, GaN, and GaP wafers for ICs and optoelectronics.

Caveat

The screen identifies material-family exposure; it does not map the gallium content of any particular AI accelerator, transceiver, or RF module.

Claims
  • primary confirmedhighfact

    USGS identifies most U.S. gallium consumption as GaAs, GaN, and GaP wafers used in integrated circuits and optoelectronic devices, and China announced export controls on gallium-related items in 2023.

Sources
Input family

Indium compounds and transparent conductors

Indium exposure sits at the interface of conductivity and optical transparency, plus compound-semiconductor detector and photonic-device families.

Evidence
primary confirmed
Confidence
medium
Sources

2

Example materials
Indium tin oxideInPInGaAsInSb
End uses
  • Transparent electrodes and displays
  • Photodetectors and optical communications components
  • Sensors, imaging, and optoelectronic packaging
China / export-control relevance

High for control signal: Chinese government sources reported export controls on indium-related items in 2025. Device-level exposure depends on whether the architecture uses ITO or indium compound semiconductors.

Caveat

ITO is common in displays and transparent electrodes, but this does not mean all AI hardware has material exposure at strategic scale.

Claims
  • primary confirmedmediumfact

    Indium exposure enters photonics and AI hardware through indium compounds including indium tin oxide transparent conductors, while China announced export controls on indium-related items in 2025.

Sources
Input family

Germanium materials

Germanium exposure is strongest where infrared transmission, fiber-optic glass chemistry, or high-speed semiconductor materials matter to sensing, communications, or packaging.

Evidence
primary confirmed
Confidence
high
Sources

2

Example materials
Ge substratesGe lenses and windowsGeCl4SiGe
End uses
  • Infrared optics and thermal imaging
  • Fiber-optic systems
  • Semiconductor substrates and silicon-germanium electronics
China / export-control relevance

High: China announced export controls on germanium-related items in 2023, and USGS describes germanium uses in fiber optics, infrared devices, and semiconductor substrates.

Caveat

The exposure depends on optical wavelength, substrate choice, and package design; silicon photonics does not automatically imply germanium material dependence at every node.

Claims
  • primary confirmedhighfact

    USGS describes germanium as used in fiber optics, infrared night-vision devices, and semiconductor substrates, and China announced export controls on germanium-related items in 2023.

Sources
Input family

Electro-optic and dielectric oxide family

Exposure comes from specialized crystal growth, wafer quality, domain engineering, and thin-film platform availability rather than commodity tonnage.

Evidence
secondary supported
Confidence
medium
Sources

1

Example materials
LiNbO3LiTaO3BaTiO3KTaO3 and related oxide platforms
End uses
  • Electro-optic modulators
  • Frequency conversion and photonic integrated circuits
  • RF photonics, timing, sensing, and optical switching
China / export-control relevance

Currently indirect in this screen: niobium, tantalum, lithium, and oxide-wafer supply chains matter, but the selected source does not establish a China export-control event for this whole family.

Caveat

This family is included because of photonic function, not because a complete supply-chain control case has been established.

Claims
  • secondary supportedmediumfact

    Lithium niobate and related electro-optic or dielectric oxide materials are used in optical modulation, frequency conversion, and integrated photonics, making them relevant to photonics interconnect and sensing exposure screens.

Input family

Tellurium-centered IR, acousto-optic, and radiation materials

Tellurium exposure appears in specialty crystal and compound materials where optical, acoustic, or radiation-response properties are hard to substitute quickly.

Evidence
primary confirmed
Confidence
medium
Sources

3

Example materials
TeO2CdTeCdZnTePbTe and related tellurides
End uses
  • Acousto-optic modulators and deflectors
  • Infrared and radiation-detection materials
  • Photovoltaic and specialized optoelectronic materials
China / export-control relevance

High for control signal: Chinese government sources reported export controls on tellurium-related items in 2025; USGS also treats tellurium as a byproduct commodity with concentrated supply context.

Caveat

This is an architecture-dependent exposure family. Te-centered materials are important in specific photonic and detector systems, not universal AI hardware inputs.

Claims
  • primary confirmedmediumfact

    Tellurium exposure includes tellurium dioxide crystals for acousto-optic devices and broader tellurium materials used in infrared, radiation-detection, and optoelectronic contexts; China announced export controls on tellurium-related items in 2025.

Sources