An active q-switched fiber laser with narrow linewidth, narrow pulse width and high repetition rate

Abstract

The invention discloses an active Q-switching fiber laser with narrow line width, narrow pulse width and high repetition frequency. The output port of the pump source is connected with the pump port of the pump fiber combiner. The common end is connected to one end of the doped fiber 1, the other end of the doped fiber 1 is directly used as the input fiber of the port 1 of the pump stripper 4, the port 2 of the pump stripper is connected to the port 1 of the fiber coupler, and the fiber is coupled The port three of the modulator is connected to the port one of the modulator, the port four of the fiber coupler is used as the laser output port, the port two of the modulator is connected to the port one of the circulator, and the port three of the circulator is connected to one end of the second doped fiber. The other end of the second doped fiber is connected with the signal end of the pump fiber combiner. The invention can not only narrow the pulse width of the Q-switched pulse, but also greatly increase the repetition frequency of the Q-switched pulse, and finally realize the output of the Q-switched pulse with high repetition frequency, narrow line width and narrow pulse width.

Description

technical field [0001] The invention relates to the technical field of high-energy nanosecond laser pulses, in particular to an active Q-switched fiber laser with narrow line width, narrow pulse width and high repetition frequency. Background technique [0002] High-energy nanosecond laser pulses have extremely important applications in the fields of precision machining, laser radar, and nonlinear frequency conversion. Usually, such pulses are obtained by a MOPA system composed of a high-quality seed light source followed by a power amplifier, and the pulse seed sources mainly include directly modulated semiconductor lasers, Q-switched solid-state lasers, and fiber lasers. In contrast, Q-switched fiber lasers have the advantages of good beam quality, compact structure, high conversion efficiency, and little influence from subsequent power amplifiers, making them ideal seed sources for high-energy nanosecond laser pulses. At present, linear cavity Q-switched lasers based on ...

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Problems solved by technology

However, if you want to obtain a Q-switched pulse with a narrower linewidth, you need to use a sub-nanometer narrow-band filter, which will inevitably weaken the feedback strength of the resonator, and the gain self-saturation effect caused by a large amount of amplified spontaneous emission (ASE) will cause weak feedback. The signal is difficult to fully amplify in the gain fiber, making it difficult to obtain Q-switched pulses with narrow pulse width and high repetition frequency

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