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Undoped and Er-doped NaY(WO 4 ) 2  disordered single crystals have been grown by the Czochralski technique. The specific heat and thermal conductivity ( κ ) of these crystals have been characterized from  T  = 4 K to 700 K and 360 K, respectively. It is shown that  κ  exhibits anisotropy characteristic of single crystals as well as a  κ ( T ) behavior observed in glasses, with a saturation mean free phonon path of 3.6 Å and 4.5 Å for propagation along  a  and  c  crystal axes, respectively. The relative energy positions and irreducible representations of Stark Er 3+  levels up to  4 G 7/2  multiplet have been determined by the combination of experimental low (<10 K) temperature optical absorption and photoluminescence measurements and simulations with a single-electron Hamiltonian including both free-ion and crystal field interactions. Absorption, emission and gain cross sections of the  4 I 13/2 ↔ 4 I 15/2  laser related transition have been determined at 77 K. The  4 I 13/2  Er 3+  lifetime (τ) was measured in the temperature range of 77–300 K, and was found to change from τ (77K) ≈ 4.5 ms to τ (300K) ≈ 3.5 ms. Laser operation is demonstrated at 77 K and 300 K by resonantly pumping the  4 I 13/2  multiplet at λ≈1500 nm with a broadband (FWHM≈20 nm) diode laser source perfectly matching the 77 K crystal  4 I 15/2  →  4 I 13/2  absorption profile. At 77 K as much as 5.5 W of output power were obtained in π-polarized configuration with a slope efficiency versus absorbed pump power of 57%, the free running laser wavelength in air was λ≈1611 nm with the laser output bandwidth of 3.5 nm. The laser emission was tunable over 30.7 nm, from 1590.7 nm to 1621.4 nm, for the same π-polarized configuration.

Thermal Characterization, Crystal Field Analysis and In-Band Pumped Laser Performance of Er Doped NaY(WO4)2 Disordered Laser Crystals