High-repetition-frequency passive-mode-locking ultrashort-pulse all-fiber laser

Abstract

A high-repetition-frequency passive-mode-locking ultrashort-pulse all-fiber laser belongs to a laser technology and the nonlinear optics field. The laser mainly comprises: a laser pumping source, a wavelength division multiplexer, a fiber bragg grating, a doped fiber, a saturable absorber and the like. A short linear cavity is used to realize the high repetition frequency of the passive mode locking and ultrashort laser pulse output. The high-repetition-frequency ultrashort-pulse fiber laser uses a design of an all-fiber structure. Through multistage fiber power amplifiers, average output power can reach hundred watts. Therefore, by using the high-repetition-frequency ultrashort-pulse all-fiber laser, industrialization application is easy to be realized.

Description

technical field [0001] The invention relates to a high repetition frequency passive mode-locked ultrashort pulse all-fiber laser, which belongs to the field of laser technology and nonlinear optics. Background technique [0002] A high-power ultrashort pulse fiber laser usually consists of a low-power seed source and a multi-stage power amplifier. The low-power seed source determines key properties such as the output wavelength, pulse width, and repetition frequency of the laser, while the power amplifier determines the average power, pulse energy, and peak power of the laser output. Since the repetition frequency of the high-power ultrashort pulse fiber laser seed source is generally between 500kHz and 100MHz, the average output power of the seed source after passing through the fiber amplifier is less than a hundred watts. In the case of maintaining the same laser peak power, in order to obtain higher average output power, it can be achieved by increasing the repetition f...

AI Technical Summary

Problems solved by technology

However, the pulse gain switching semiconductor laser has the disadvantages of complex structure and high production cost; while the harmonic passive mode-locked fiber laser has large jitter and relatively poor environmental stability; the high repetition rate passive mode-locked fiber laser does not require any external active modulation device, so the laser system has a simple structure and low cost and has been favored in recent years

At present, the highest repetition frequency of passively mode-locked fiber lasers with all-fiber structure is about 200MHz, the laser pulse width is on the order of hundreds of femtoseconds, and the output power after passing through multi-stage fiber amplifiers is also less than a hundred watts.

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