Gain narrowing controlled all-fiber laser amplifier for high-power picosecond pulses

Abstract

The invention discloses a gain narrowing controlled all-fiber laser amplifier for high-power picosecond pulses. The laser amplifier comprises an all-fiber picosecond seed resource. An optical fiber amplifier is connected to an output end of the all-fiber picosecond seed resource, and an output module is connected to an output end of the optical fiber amplifier; the all-fiber picosecond seed resource is a mode-locked laser in an all-fiber ring cavity structure and comprises a pump laser, a wavelength division multiplexer, a gain optical fiber, an output coupler, a first polarization controller, a polarization beam splitter, a second polarization controller and a polarization independent isolator; and a polarization-maintaining output end of the polarization beam splitter serves as an output end of the all-fiber picosecond seed resource, a non polarization-maintaining output end of the polarization beam splitter is connected with an input end of the polarization independent isolator, the second polarization controller is fixed on an optical fiber between the polarization beam splitter and the polarization independent isolator, and an output end of the polarization independent isolator is connected with the other input end of the wavelength division multiplexer, accordingly, an all-fiber ring structure is formed. By means of the gain narrowing controlled all-fiber laser amplifier for high-power picosecond pulses, long-term stable high-power picosecond pulse laser is obtained easily, and the manufacture cost of a high-power optical fiber laser system can be reduced.

Description

Technical field [0001] The invention relates to an all-fiber high-power picosecond pulse laser amplifier controlled by gain narrowing. Background technique [0002] The high-power picosecond pulse has the advantages of narrow pulse width, high peak power, good monochromaticity, and the interaction time with the material is longer than the thermal diffusion time. It is widely used in micro-nano processing, medical processing, precision ranging, high-speed communication and national defense. , Is one of the cutting-edge research directions in the laser field. Especially in applications such as nonlinear optical frequency conversion, high-power laser pulses can achieve higher conversion efficiency. At present, there are mainly three commonly used methods for generating picosecond pulses: directly modulating fast-response semiconductor lasers, using materials with saturable absorption properties as optical switches, and achieving picosecond pulse output through nonlinear polarizatio...

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Problems solved by technology

However, in principle, these devices intercept a small part of the energy from a wide spectrum. The average power of the filtered seed laser is low, and the corresponding mode-locking of the fiber laser is difficult to control stably; moreover, a larger number is required for subsequent amplification. amplifier, this method increases the complexity of the system on the one hand, and also greatly increases the cost of the product

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