Peak power intensifier and high peak power MOPA fiber laser

Abstract

The invention relates to a peak power intensifier and a high peak power MOPA fiber laser. The peak power intensifier comprises a master oscillator assembly and a power amplification assembly. The master oscillator assembly comprises a seed resource laser and a forward isolator. The power amplification assembly comprises a plurality of diode-pumped lasers, a beam combiner and a peak power intensifier. The peak power intensifier comprises a diode-pumped module, a first collimating lens, a second collimating lens, an input tail fiber and an expanded beam lens. After a laser signal is output from the beam combiner, the laser signal sequentially passes through the first collimating lens, the diode-pumped module, the second collimating lens and the expanded beam lens, and then a high peak power laser signal is output. The peak power intensifier directly replaces a main amplification light path in an optical fiber MOPA structure, and the high-power isolator serves as the main amplification light path in the MOPA laser to directly output light, as a result, the light path optical fiber length can be reduced greatly, the nonlinear effect of a light path amplification system is effectively restrained, and the peak power output by the laser is increased.

Description

technical field [0001] The invention relates to a high-power MOPA fiber laser. Background technique [0002] Due to its compact structure, good light speed and quality, high efficiency, narrow line width, narrow pulse width and high peak power, fiber MOPA lasers can be widely used in marking, drilling, micromachining, military, laser medicine and other fields. [0003] The structure of the existing fiber laser is as follows figure 1 As shown, it usually includes a main oscillator part 10 and a power amplification part 20. The main function of the main oscillator is to generate high-quality seed light, and the output power can be large or small, so the output light is easier to achieve the required time domain, Frequency domain characteristics and maintain good beam quality; the main function of the power amplification part is to amplify the seed light, which is composed of one or several stages of fiber amplifiers, while ensuring the high beam quality of the output light an...

AI Technical Summary

Problems solved by technology

[0006] The disadvantage of this method is that the output power of the seed source is small. Due to the multi-stage amplification to achieve the required power, and before each stage of amplification, an optical fiber isolator, a certain length of active optical fiber and the remaining optical fiber in each component are required. etc., it is easy to produce nonlinear effects inside the fiber, that is, the peak power of the above-mentioned entire fiber laser is suppressed at 25KW, which limits the further improvement of its output power, thereby inhibiting the enhancement of peak power

If the peak power is higher than 25KW, the stability of the laser optical system cannot be guaranteed

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