Abstract
A comparative study of three disordered calcium niobium gallium garnet (CNGG)-type crystals codoped with Tm<sup>3+</sup> and Ho<sup>3+</sup> ions is performed: (i) without host modifiers (CNGG), (ii) with Li<sup>+</sup> cations added (CLNGG), and (iii) with Li<sup>+</sup> and La<sup>3+</sup> cations added (LCLNGG), all grown by the Czochralski method. The crystals exhibit inhomogeneously broadened luminescence bands extending beyond 2.1 μm. A diode-pumped Tm,Ho:LCLNGG laser generates 562 mW at 2082 nm with a slope efficiency of 17.4% and a laser threshold of 0.46 W. A continuous wavelength tuning between 1904.1 and 2121.1 nm (tuning range: 217 nm) is achieved with this new garnet compound. The Tm,Ho:LCLNGG crystal is promising for generation of ultrashort pulses from mode-locked lasers emitting above 2 μm.
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