▎ 摘　　要

A diode-pumped Tm:YAlO3 (Tm:YAP), solid-state Q-switched mode-locking (QML) laser was achieved for the first time by using a graphene oxide saturable absorber on gold reflective film. A pulse width for mode-locking inside the Q-switch envelope of 2?ns with a repetition rate of 156.25?MHz has been obtained at the central wavelength of 1973?nm (32?nm full width at half maximum). The measured maximum average output power amounts to 464 mW under an incident pump power of 9.52?W. By using graphene oxide saturable absorber on golden reflective film instead of the tail end cavity mirror, we not only achieved a broadened spectral region 2?mu m laser, but also deepened the modulation of the QML.