Abstract
We present a quantitative comparison between thermal lenses under lasing and non-lasing conditions in a diode-laser pumped self-frequency-doubled Nd,Lu:YAl3(BO3)4 laser using an interferometric technique. At the pump power of 1.5 W, the thermal lens under the non-lasing condition attained 8 m-1, and this corresponded to 170% of that under the lasing condition. Validity of the measured thermal lenses was confirmed by investigating the dependence of output power on the cavity length. The difference between thermal lenses under lasing and non-lasing conditions is caused by the nonradiative loss process of the upper level due to the cross-relaxation.
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