Core Optics

A pair of polished Advanced LIGO end mirrors (ETM’s)

Core optics are the 40-kg masses that form the heart of a LIGO detector. A core optic is manufactured from fused silica, polished to a few nanometers of smoothness and coated with dozens of layers of optical coatings. The result is a tuning of the balance of reflection and transmission of the mirror at the parts per million level. See: Advanced LIGO

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