The invention provides a passive all-optical synchronous all-polarization-maintaining ultrafast fiber laser system, A laser cavity for interfering with that spontaneous emission to stabilize the output pulse and a gain optical fib for absorbing the pumped light to generate spontaneous emission are provided And the master laser, for injecting pulses into the slave laser, and using nonlinear phasemodulation to modulate the intensity of slave laser, so that the synchronous pulse output from the laser is carried out, wherein the laser cavity is 8-shaped cavity or 9-shaped cavity, having a non-linear magnifying annular mirror, The laser cavity is a fully polarization-maintaining laser cavity configuration based on a nonlinear amplifying ring mirror, and the laser cavity is provided with a first optical fiber wavelength division multiplexer, a second optical fiber wavelength division multiplexer, a first optical fiber beam splitter and a second optical fiber beam splitter in series, and anoptical fiber mirror for reflecting pulses to form a laser cavity loop The laser cavity includes a first optical fiber wavelength division multiplexer, a second optical fiber wavelength division multiplexer, and a second optical fiber beam splitter

A passive all-optical synchronous all-polarization-maintaining ultrafast fiber laser system

The invention belongs to the technical field of fiber lasers, and particularly relates to an all-fiber mode-locked fiber laser. An existing mode-locked fiber laser is low in damage threshold value, not high in stability and not compact in structure. The provided all-fiber mode-locked fiber laser comprises a laser emitting assembly, a wavelength division multiplexer, an all-fiber saturable absorption assembly, a coupler, a gain fiber and a polarization independent isolator which are connected in sequence, wherein the polarization independent isolator is connected with the wavelength division multiplexer; and the all-fiber saturable absorption assembly comprises a polarization controller and an optical fiber group, wherein the optical fiber group comprises a single-mode optical fiber, a single-cladding multimode optical fiber and an output single-mode optical fiber which are connected in sequence. Mode locking is achieved through the nonlinear multimode interference effect in the multimode optical fiber, traditional soliton output in the 1.5-micron waveband is obtained, and high-order harmonic mode locking is achieved. The all-fiber mode-locked fiber laser has an all-fiber structure,and is high in damage threshold, high in stability and compact in structure.

All-fiber mode-locked fiber laser

The invention relates to a nonlinear polarization rotary mode-locked laser of an all-polarization-maintaining fiber. The nonlinear polarization rotary mode-locked laser is formed through the sequential connection of a wavelength division multiplexer, a gain fiber, a polarization-related isolator, a spiral fiber and a polarization-related beam splitter, the closed loop light path forms a resonant cavity, and the spiral fiber and the polarization-related beam splitter form a non-linear optical switch to realize the passive mode locking. The whole annular cavity structure is formed by connectingoptical fibers or optical fiber coupling devices. The fiber-space-fiber light path conversion is not needed, and the space light is not needed to be tediously adjusted. The influence of mechanical disturbance is naturally weakened, the spiral fiber realizes the polarization rotation evolution, and meanwhile, the polarization state of the polarization beam splitter can be changed by combining the spiral angle as a polarization controller, and the narrow pulse is realized. A traditional polarization control mode is changed. Meanwhile, the nonlinear polarization rotation control of the polarization maintaining fiber is realized simply and directly in a new form.

Nonlinear polarization rotary mode-locked laser of all-polarization-maintaining fiber

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Nonlinear polarization rotary mode-locked laser of all-polarization-maintaining fiber