English: Optical and near-IR transmittance of a ca. 1 cm thick ruby crystal. Measured on an automatic Shimadzu spectrometer. Note the two broad blue and green absorption bands and one narrow absorption band on the wavelength of 694 nm, which is the wavelength of the ruby laser.
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{{Information |Description=Optical and near-IR transmittance of a ca. 1 cm thick ruby crystal. Measured on the Shimadzu spectrometer. Note the two broad UV and blue absorption bands and one narrow absorption band on the wavelenght of 694 nm, which is the