Abstract
Excited state absorption of laser (≅ 1.3 µ m, corresponding to the laser channel) and pump (790-860 nm) radiation have been investigated in Nd doped YAl 3 (BO 3 ) 4 non-linear laser crystal. Laser gain slope efficiency measurements as a function of pump wavelength have been used to estimate the excited state absorption of pump radiation. On the other hand, excited state absorption cross-section in the 1300−1400 nm wavelength range has been measured by using two beam spectroscopy. We have obtained that excited state absorption cross-section for pump radiation is negligible whereas around 1.3 µ m it is comparable to the stimulated emission cross-section from 4 F 3/2 state, so that the net gain cross-section becomes negative for certain wavelengths.
Published Version
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