Optical fiber femtosecond laser oscillator

Abstract

The invention provides an optical fiber femtosecond laser oscillator, which is characterized in that a pump laser (6) and a pump laser (7) respectively pump a first optical fiber (2) and a second optical fiber (3) to generate wide-spectrum emergent light, the emergent light is adjusted into a multi-wavelength light beam which is linearly distributed in space through a dispersion control device (4), the multi-wavelength light beam passes through a reflection end mirror (5) and then carries out spectrum screening on the emergent light again, the light beam subjected to spectrum screening is transmitted to a mode locking device (1) through the dispersion control device (4), the second optical fiber (3) and the first optical fiber (2) in sequence, the mode locking device (1) fixes the phase relation of the emergent light and compresses the pulse width, and the emergent light is emitted to obtain femtosecond-magnitude light pulses. According to the optical fiber femtosecond laser oscillator provided by the invention, the gain bandwidth of the femtosecond laser oscillator is expanded by adding a new gain medium in the oscillator, so that femtosecond laser pulse output with wider spectrum and narrower pulse width is output.

Description

technical field [0001] The present application relates to the field of laser technology, in particular to a fiber femtosecond laser oscillator. Background technique [0002] High-power fiber femtosecond lasers have a wide range of applications in the fields of micro-nano processing, biomedicine, scientific research and national defense. At present, the main components of mainstream high-power fiber femtosecond lasers include: fiber femtosecond laser oscillator, spectral broadening part, high-power laser amplification part and spectral compression part. Among them, the fiber laser oscillator provides seed pulses for the entire laser system and is one of the core parts of the entire system. Its output characteristics determine the pulse quality, stability and other performance indicators of the laser system. The spectral width output by the fiber laser oscillator directly determines the spectral evolution during the amplification process, and finally determines the compressed...

AI Technical Summary

Problems solved by technology

[0004] 1. The oscillator fiber generally uses a single doped fiber. Due to the limitation of the gain bandwidth, the output spectrum width of the oscillator is narrow and the pulse width is relatively wide;

[0005] 2. Although the output spectral width of the femtosecond laser oscillator can be increased by using a nonlinear method, under this condition, parameters such as dispersion, gain, and loss need to be precisely modulated, the mode-locking is unstable, and the output pulse width exists The situation of jumping increases the complexity of the system and reduces the reliability of the work

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