Stable seed source used for high-power MOPA pulse laser

Abstract

The invention relates to the technical field of fiber gratings and fiber lasers, and particularly discloses a stable seed source used for a high-power master oscillator power-amplifier (MOPA) pulse laser. The stable seed source comprises an F-P semiconductor laser, the fiber gratings, optical fibers used for manufacturing the fiber gratings and a depolarizer, wherein the F-P semiconductor laser, the fiber gratings, the optical fibers and the depolarizer are successively arranged along the light transmission direction. The stable seed source is a signal light source which is simple in structure, stable in central wavelength, stable in peak wavelength, stable in linewidth, low in cost and great in performance and can act as the fiber laser through amplification, then the optical fibers are connected with the simple and cheap depolarizer, and the laser polarization obtained through the depolarizer is greater than or equal to 10DB so that the light is close to non-polarized light, the light is amplified and passes through a vibrating mirror and then laser processing is performed and thus the fine processing precision can be achieved.

Description

technical field [0001] The invention relates to the technical field of fiber gratings and fiber lasers, in particular to a stable seed source for high-power MOPA pulse lasers. Background technique [0002] With the deepening of laser research, short-pulse fiber lasers with high power, high peak power, high single pulse energy, and high beam quality have attractive application prospects in the fields of micromachining, marking, etc., and have become a research topic for people today. One of the hot spots. The single pulse energy of traditional single Q-switched or mode-locked pulsed fiber lasers is often limited, which limits its application fields. [0003] The master oscillator power amplification (Master Oscillator Power-Amplifier, MOPA) technology can further increase the pulse energy. The high-energy pulse laser obtained by this structure in the optical fiber is the same as the laser spectral wavelength and pulse repetition frequency of the seed signal light source, and...

AI Technical Summary

Problems solved by technology

[0005] The spectrum and line width of the laser output from the tail fiber of the existing F-P semiconductor laser are relatively wide, which is not easy to control

At the same time, due to the difference in the temperature of the environment where the semiconductor laser is located and the difference in the control current, the central wavelength or peak wavelength of the spectral bandwidth below 10dB of the laser will drift, which seriously affects the stability of the amplified high-power fiber laser.

[0006] like Figure 4 As shown, the pulse generated by the ordinary F-P semiconductor laser is amplified and then a spike is generated due to nonlinear phenomena. The peak power of this sudden peak is at least 3 times the peak power of the normal amplified pulse, which will seriously damage the inside of the laser. corresponding device

At the same time, the light output directly from the F-P semiconductor laser is polarized light, and the amplified laser is used for the vibrating mirror used in laser processing. The vibrating mirror is very sensitive to polarized light, which leads to problems such as uneven laser processing, which seriously affects the Precision

Images