Light-operated triggering laser device

The invention discloses a light-operated triggering laser device which comprises a saturable absorber, a light amplifier, an optical fiber circulator, a fiber Bragg grating and a pumping module. Key elements are the light amplifier and the saturable absorber. The light amplifier is fully pumped and provides gain for a whole resonant cavity. The saturable absorber provides main loss in the resonant cavity. In an original state, gain in the cavity is smaller than loss, and laser outgoing cannot be formed. Singe triggering is injected to the resonant cavity to start optical pulses, and light-operated triggering laser starting is achieved. In a laser starting state, singe triggering is injected to the resonant cavity to close optical pulses, and laser closing is achieved. Triggering optical pulse action time is finished, the laser device is recovered to the state of non-triggering starting, gain in the cavity is smaller than loss, the laser closing state is maintained continuously, and accordingly light-operated triggering laser closing is completely achieved. The light-operated triggering laser device is simple and compact in structure, a light-operated switch does not need to be connected in from the outside of the cavity, and accordingly the whole framework is stable.