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Thermal emission spectra of ruby single crystals in the range 400–800 nm were studied experimentally as functions of the intensity at 10.6 μm of exciting pulses (~0.5 s) from a continuous-wave electrical-discharge CO2 laser. Spectra at excitation intensity 1–20 kW/cm2 were superpositions of the thermal emission continuum of the sapphire crystal lattice in the range 600–800 nm and selective emission...
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