MHz photonic crystal fiber ultra-short pulse laser based on multichannel pulse compressor

Abstract

The invention discloses a MHz photonic crystal fiber ultra-short pulse laser based on a multichannel pulse compressor. The laser comprises a diode pumping source, a photonic crystal fiber, an intra-cavity pulse compressor, a semiconductor saturable absorber mirror and an extra-cavity pulse compressor, wherein the inter-cavity pulse compressor and the extra-cavity pulse compressor respectively are an intra-cavity multichannel pulse compressor and an extra-cavity multichannel pulse compressor. The main bodies of the multichannel pulse compressors are end mirrors in which two concave spherical surfaces are coaxially and oppositely arranged, each end mirror is provided with a rotating ring, and a concave spherical reflector is arranged in the rotating ring. The MHz photonic crystal fiber ultra-short pulse laser has the advantages that the low recurrence frequency of the pulse laser greatly reduces heat accumulation of pulse on components and prolongs the service life of the components, meanwhile, the intra-cavity multichannel compressor and the extra-cavity multichannel compressor with low loss and compact structure overcome the disadvantages of other chromatic dispersion compensation technologies, and the ultra-short pulse laser with low cost, high energy and high peak power output is realized.

Description

technical field [0001] The invention relates to a megahertz photonic crystal fiber ultrashort pulse laser based on a multi-pass pulse compressor, belonging to the technical field of ultrashort pulse lasers. Background technique [0002] The prior art [1] is an optical fiber chirped pulse amplification system capable of outputting 1MHz repetition frequency and microjoule-level single pulse energy. It includes a fiber ultrashort pulse oscillator that provides a 28MHz repetition rate seed pulse, and relies on an acousto-optic modulator (AOM) to reduce the repetition rate to 1MHz. At the same time, the system also includes a fiber stretcher (fiber stretcher) and two-stage optical fiber amplifier, so the system is very complex and the cost is very high. Due to the small mode field area and high nonlinear coefficient of ordinary optical fiber, the fiber ultrashort pulse oscillator composed of it as the main body cannot support ultrashort pulses with high single pulse energy. The...

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Problems solved by technology

However, the traditional dispersion mirror compensation technology usually makes a dispersion compensation film system on a flat lens substrate. After multiple reflections, the spot usually becomes very large, and an additional beam reduction element is required, which brings additional energy loss and increases the The number and complexity of components in the system, and it is not easy to adjust easily

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