Fiber laser system with narrow-line-width and high-peak power pulse output

Abstract

The invention provides a fiber laser system with narrow-line-width and high-peak power pulse output. The fiber laser system comprises a seed laser source generator capable of generating narrow-line-width seed laser which is of wavelength interval 1-50 nm and outputs multiple wavelengths. The seed laser is amplified through a high-power fiber amplifier and then output through an output fiber. The seed laser source generator comprises at least two narrow-line-width lasers with low-power fiber output, pulse modulation circuits with sequential control, a fiber combiner and a first optical isolator; laser emitted by each narrow-line-width laser is modulated by the corresponding pulse modulation circuit and then passes through the fiber combiner and the first optical isolator sequentially. The multiple low-power narrow-line-width pulse seed lasers generated by the fiber laser system have high power, thus gain of the fiber amplifier is reduced. With the low-power narrow-line-width pulse seed laser sources, power of laser of each wavelength can be reduced during amplification, and nonlinear effects such as stimulated Brillouin scattering and stimulated Raman scattering can be avoided.

Description

technical field [0001] The invention belongs to the field of laser technology, in particular to a fiber laser system with narrow line width and high peak power pulse output. Background technique [0002] In the application fields of atmospheric detection, 3D scanning, wind radar, remote sensing detection, optical sensing (Brillouin optical time domain reflectometer), laser frequency conversion, etc., pulsed lasers with narrow linewidth and high peak power are required. [0003] Because the core diameter of the fiber is small, the laser power density in the fiber core is high, especially when the pulse laser is output, its peak power is high, which is prone to nonlinear effects. [0004] When the high peak power laser is output, the output laser in the fiber will be affected by nonlinear effects such as stimulated Brillouin scattering and stimulated Raman scattering, resulting in a new wavelength of light output. When there are multiple wavelengths of laser output, if the ph...

AI Technical Summary

Problems solved by technology

However, the fiber laser with F-P structure contains laser output of multiple longitudinal modes, and the interval between each longitudinal mode is small, so it is very easy to meet the phase matching condition. When the high-power laser output, four longitudinal modes will be generated Wave mixing effect produces more new wavelength laser output, which is not conducive to practical use

Images