High beam quality narrow linewidth microsecond pulse Ti:sapphire laser operating at 819.710 nm

摘要

A sub-pm linewidth high beam quality microsecond (ps) Ti:sapphire laser was reported, which was end-pumped by a frequency-doubled 1064 nm Nd:YAG laser. By inserting three birefringent plates tuner and one etalon into the cavity of the Ti:sapphire laser, a similar to 0.8 pm linewidth at 819.710 nm was achieved with a maximum output power of 3 W operating at a high repetition rate of 500 Hz with pulse width of similar to 25 mu s. The beam quality factor M-2 was measured to be similar to 1.14. The wavelength could be finely tuned from 819.699 to 819.718 nm with tuning resolution of 0.76 pm. To the best of our knowledge, this is the first demonstration on the mu s pulse Ti:sapphire laser at 819.710 nm with narrow linewidth and high beam quality simultaneously. Such mu s 819.710 nm laser could be used to efficiently generate a polychromatic laser guide star together with a 589 nm laser for the tip-tilt correction of ground-based telescopes.