Athermal glass for the infrared.
Refractive indices of four CLAP glass systems are measured at room temperature and at higher temperatures in the wavelength range of 0.4-5.5 microm. The coefficients of temperature changes of optical path lengths are calculated and are <1 x 10(-6)/ degrees C in the wavelength range longer than 1microm. This suggests an athermal glass application in the infrared ray region.
Mitachi
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