Feedback type high-peak-power picosecond-pulse fiber laser system

Abstract

The invention relates to a feedback type high-peak-power picosecond-pulse fiber laser system. A pulse shaping unit is added to the rear of a seed source to shape pulses, the pulse width of the seed source is compressed, the waveform of the seed source is improved, and the quality of seed light is improved. A fiber isolator and a narrow-band filter are connected to the front of a pre-amplifier stage and the front of a main amplifier stage respectively, harmful ASE is filtered out, and the stability of the system is improved. A red light indicator is added between the pre-amplifier stage and the main amplifier stage, and thus the safety and the flexibility of operation on a laser are improved. Photodiodes are connected to the rear of the seed source and the rear of the main amplifier stage respectively, and real-time protection and dynamic power regulation of the laser are achieved through a master control unit. The feedback type high-peak-power picosecond-pulse fiber laser system is an all-fiber system, and thus the mechanical stability and the adaptability to the environment of the system can be effectively improved. The quality of light beams of the laser is improved through a fiber grating, the narrow-band filter and a pattern adapter, the nonlinear effect in a doped fiber is effectively suppressed, and high-peak-power picosecond-pulse laser output is achieved.

Description

technical field [0001] The invention relates to the field of fiber lasers, in particular to a feedback type high peak power picosecond pulse fiber laser system. Background technique [0002] High-power picosecond pulsed fiber lasers have the advantages of good beam quality, narrow pulse width, "cold" ablation of materials, high reliability, easy integration, and no need for complicated maintenance. field of material processing. [0003] At present, the main control oscillation-amplification (MOPA) method is used to obtain picosecond pulses with high peak power. The seed source MO generally uses a fast-response modulated semiconductor laser to generate seed light with a pulse width of the order of picoseconds. The seed light Injected into the amplifier PA for amplification. Although short-pulse lasers can be obtained by driving semiconductor lasers with short pulses, the spectral width is narrow. If no processing is performed, the pulse will be broadened and the noise will ...

AI Technical Summary

Problems solved by technology

Although short-pulse lasers can be obtained by driving semiconductor lasers with short pulses, the spectral width is narrow. If not processed, the pulse will be broadened and the noise will be enhanced during re-amplification, which limits the increase in the peak power of the laser.

[0004] During the long-term use of the laser, the power of the pump semiconductor laser and other devices will fluctuate due to the influence of temperature, which directly affects the stability of the output power of the laser. The consistency and integrity of the laser processing process cannot meet the requirements.

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