A diode-pumped tunable CW laser at quasi-three-level has been demonstrated. The output power up to at the central wavelength of was obtained, corresponding to a slope efficiency of 29.7%. Taking advantage of the broad emission spectrum of the disordered crystal Nd:LGS, we tuned the laser wavelength within the spectral range of 899.8 to with an etalon inserted into the V-type cavity. To the best of our knowledge, it is the first time to obtain a tunable laser based on the transition of -doped crystals.
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