Network coherent amplification method for all-fiber chirped pulses

Abstract

The invention discloses a network coherent amplification method for all-fiber chirped pulses. The method comprises the following steps of: pre-amplifying seed light by utilizing a low-noise fiber amplifier; splitting pre-amplified laser pulses into a plurality of paths by using a fiber beam splitter, wherein each path of light passes through a zero-frequency pre-compensation type cascade amplification system and a pulse width compression system respectively; and coherently synthesizing a plurality of paths of light into a path of high-power laser by using a fiber beam combiner. By a coherent amplification network, the problems of thermal effect, pulse deformation, noise and the like of direct amplification of light pulses are solved; and in addition, by a pre-compensation technology, carrier-envelope phase locking is stable and high in accuracy and output power compared with the conventional method of performing amplification, measuring a carrier phase by using an f-to-2f system and controlling a laser by using the feedback of a phase-locked circuit.

Description

technical field [0001] The invention relates to the field of laser science and technology, in particular to the amplification of high-power ultrashort laser pulses, carrier envelope phase control and laser coherent synthesis technology. Background technique [0002] High-power femtosecond laser frequency comb technology (referred to as high-power optical comb) is an important means of studying basic physics, and plays a vital role in promoting the measurement accuracy of basic physical quantities such as time, frequency, and length. At the same time, as a basic technology, high-power optical combs are of great significance to the development of many high-tech technologies. For example, the high-resolution characteristics of optical comb spectra can be well applied to precision spectroscopy, optical clocks, frequency synthesis and measurement; Precise and stable characteristics can be used for macromolecular imaging, quantum coherence control, precise imaging, precise timing ...

AI Technical Summary

Problems solved by technology

This method can avoid the splitting of high-energy pulses in the laser cavity, but the CEP will be affected by the additional noise of the optical power amplifier

These noises include poor system stability caused by thermal effects, and severe pulse width broadening caused by dispersion effects caused by high-order nonlinearities, etc.

Therefore, the current schemes for obtaining high-power optical combs are mainly affected by the negative impact of the laser amplification process on the control accuracy of the carrier envelope phase of the optical comb, and the limitation of the time width of the laser pulse.

[0004] To sum up, although there are many schemes for generating high-energy laser combs, there are more or less technical deficiencies and defects in all of them.

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