Fe₃O₄ nanoparticles (FONP) are made into saturable absorbers and assembled into the resonant cavity, for the first time, and passively Q-switched mode-locked (QML) pulse output is realized in a 1.3 μm all-solid-state laser. When the pump power increases to 8 W, the repetition frequency of the Q-switched pulse increases from 47 kHz to 116 kHz, the pulse width changes from 1.137 μs to 767 ns, and the corresponding single pulse energy is 1.2 μJ. At the same time, the passively QML operation was observed on the oscilloscope, with a pulse repetition frequency of 154.5 MHz and a pulse width of 660 ps. Our experiments demonstrate that FONP exhibits good nonlinear optical characteristics in the 1.3 μm waveband, and has the potential to realize giant ultrashort and multiwavelength tunable pulse output in all-solid-state pulsed lasers.

的Fe ₃ ø _4个纳米颗粒（FONP）被制成可饱和吸收体和组装成谐振腔，用于在第一时间，和被动Q开关模式同步（QML）脉冲输出在1.3实现μ m该固态激光。当泵功率增加至8 W，从47千赫至116千赫的Q开关脉冲的增加重复频率，宽度从1.137改变脉冲μ s至767纳秒，和相应的单脉冲能量为1.2 μ J.在同时，在示波器上观察到被动QML操作，脉冲重复频率为154.5 MHz，脉冲宽度为660 ps。我们的实验表明，表现出FONP在1.3良好的非线性光学特性μm波段，并有可能在全固态脉冲激光器中实现超短和多波长超大可调脉冲输出。