Abstract
An efficient, directly diode-pumped Er:YAG laser at 1617nm was demonstrated. A folding mirror with high reflectivity for the s-polarized light at the laser wavelength was used to achieve a linearly polarized laser. A maximum continuous-wave output power of 7.73W was yielded under incident pump power of 50.57W, and the optical conversion efficiency with respect to incident pump power was ∼15.28%, which was the highest optical conversion efficiency with directly diode-pumped Er:YAG lasers up to now; in Q-switched operation, the maximum pulse energy of 7.82mJ was generated with pulse duration of about 80ns at a pulse repetition frequency of 500Hz.
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