All-fiber active Q-switched laser based on saturable absorption optical fiber

Abstract

The invention discloses an all-fiber active Q-switched laser based on a saturable absorption optical fiber. The all-fiber active Q-switched laser based on the saturable absorption optical fiber comprises a fiber laser unit and an active Q-switched unit (20), wherein the active Q-switched unit (20) comprises the saturable absorption optical fiber (5), a saturable absorption optical fiber pumping wavelength division multiplexer (6), a saturable absorption optical fiber pumping source (8) and a function generator (9). The saturable absorption optical fiber (5) and the saturable absorption optical fiber pumping wavelength division multiplexer (6) are connected into an optical fiber link of the fiber laser unit in series. The function generator (9) is used for conducting electric pulse modulation on the saturable absorption optical fiber pumping source (8). According to the all-fiber active Q-switched laser based on the saturable absorption optical fiber, traditional saturable absorption passive Q-switching is converted to active Q-switching, continuous adjustment of the parameters such as the pulse width and the repetition frequency of the pumping source is achieved through the externally arranged function generator, and then the proper all-fiber structure is obtained. The all-fiber active Q-switched laser based on the saturable absorption optical fiber has the advantages of being reliable in performance, stable in output parameter, resistant to vibration, high in environmental adaptation and the like.

Description

technical field [0001] The invention relates to an all-fiber active Q-switching laser, in particular to an all-fiber active Q-switching laser based on a saturable absorption fiber. Background technique [0002] All-fiber pulsed fiber lasers have very important applications in the fields of communication, coherent lidar, and atmospheric remote sensing, especially in space-based and space-based applications. [0003] Q-switching technology is an important method for lasers to obtain pulsed output. The basic principle is that by introducing a certain periodic loss in the resonator, the resonator has a high loss in the initial state, the gain in the cavity is less than the loss, and laser oscillation cannot be generated; then the loss is reduced at an appropriate time, and the cavity The gain is greater than the loss, and laser oscillation is generated, so a very narrow laser pulse can be generated. When the intracavity loss is controlled by an external driving source, it is c...

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Problems solved by technology

However, limited by the slow thermal effect of the ytterbium-doped fiber grating region, the device needs to actively cool the grating region when the repetition frequency is greater than 1 Hz, making the structure of the device more complex

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