A. Dilieto et al., EFFECT OF TM CONCENTRATION ON THE TUNABILITY OF THE YLF LASER IN THE 1.9 MU-M REGION, Applied physics. B, Lasers and optics, 62(5), 1996, pp. 443-447
We describe the continuous-wave (cw) operation of a LiYF4 laser based
on crystals doped with different concentrations of Tm3+. We observed t
he fluorescence spectra from the upper laser level when the crystal is
placed inside the laser resonator, in the same optical environment of
the coherent emission. We measured the laser intensity as a function
of pump power and obtained a 24% slope efficiency by selecting a suita
ble orientation of the crystal. Using all this information, we were ab
le to demonstrate laser tunability at 1.9 mu m in a 50 cm(-1) wide int
erval.