The structural, optical, and spectroscopic properties of new Tm 3+ : Lu 2 O 3 laser ceramics are studied. The average size of a ceramic grain (crystallite) is found to be 540-560 nm. The absorption spectrum measured in the near-IR region shows that this ceramics can be pumped by commercially available laser diodes at wavelengths of 796 and 811 nm. The high-transmission region of the ceramics in the mid-IR region extends to 7 mm. Investigations of the luminescence spectrum in the region of 1.75-2.2 mm upon laserdiode pumping show strong lines peaked at wavelengths of 1942, 1965, and 2066 nm. Ellipsometric measurements yield refractive indices n » 1.92 at the pump wavelength 796 nm and n » 1.94 at the laser wavelength 2066 nm. Continuous-wave lasing of a Tm 3+ : Lu 2 O 3 ceramic laser at a wavelength of 2066 nm is demonstrated under diode-laser pumping at wavelengths of 796 and 811 nm.
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