Germanium and LIGO: what they have in common

1. Step 1. Germanium — is material for — Infrared seeker. The optics of infrared seekers are germanium and sapphire.
2. Step 2. Infrared seeker — has part — Photodiode. A photodetector.
3. Step 3. Photodiode — is part of — LIGO. A photodetector of the interference.

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