Gravitational signals cover all the same frequencies are electromagnetism
At https://www.emf-corp.com/optical-materials/optical-material-infrared-optics/ please use the empty space to extend to 1E15 meters to cover low fruquency electromagnetic and gravitational wavelenghts. In frequency units 1 nanoHertz has a wavelength of 2.99792458E17 meters or 1E9 Light Seconds. I am looking for LWIR and longer wavelength lens materials. Since I work a lot with gravitational sensors, it always
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