Abstract
Output powers as high as were obtained at in the cw regime with a Tm laser operating at room temperature, either with Ti-sapphire or diode laser pumping, using a new single crystal of grown by the Czochralski method and doped with of in the melt. This crystal belongs to the tetragonal space group and exhibits a locally disordered structure due to the random occupancy of the same lattice sites by Na and Gd (or Tm) ions. The local disorder results in large bandwidths of the optical transitions (e.g., at for the transition involved in the laser emission), which allows one to obtain one of the broadest laser tunability ranges, from 1813 to , achieved with a -doped crystalline material. A detailed characterization of the optical spectroscopy in this novel host was performed at 5 and .
© 2006 Optical Society of America
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