Optical fiber type pulse widening and compressing method based on polarization beam splitting

Abstract

The invention discloses an optical fiber type pulse widening and compressing method based on polarization beam splitting. According to the method, a laser pulse beam is divided into P light and S light when passing through the beam splitting face of a polarization beam splitter, the two beams of light are transmitted along different paths, the P light or the S light continues to be transmitted in the polarization beam splitter, the S light or the P light is reflected to enter an optical fiber to be transmitted, the two beams of light generate time delay of a certain degree due to difference of the transmission paths, the time delay is completely determined by length of the optical fiber, two sub-pulses at a fixed interval are formed after the P light and the S light are combined again when passing through the beam splitting face of the polarization beam splitter, the amplitude of the sub-pulses is generally one half that of the parent pulses, and the optical fiber type pulse widening and compressing method based on polarization splitting greatly reduces the peak power of the pulse. The widening amount is easily and accurately controlled, the structure is simple, assembly is easy and stability is better.

Description

technical field [0001] The invention belongs to the field of optical devices and technologies, and relates to a pulse stretching and compression method for splitting and merging pulses based on polarization beam splitting, which is used for stretching and compressing short pulse lasers. Background technique [0002] Fiber lasers are the third generation of new lasers after traditional gas lasers and solid-state lasers. They have the advantages of compact structure, long life, maintenance-free, good beam quality, energy saving and environmental protection. Among them, pulsed fiber lasers have narrow pulses, high peak power, With outstanding advantages such as no need for water cooling, it can be widely used in the fields of marking, plastic surgery, micromachining, and laser medicine. It is one of the frontier directions in the field of optoelectronic information today. [0003] Due to the high peak power of the ultrashort laser pulse, direct pulse amplification i...

AI Technical Summary

Problems solved by technology

Common pulse stretching methods include the use of grating, dispersion, nonlinear and other methods to perform chirped pulse stretching on pulses, all of which have certain disadvantages, for example, it is not easy to accurately control the amount of stretching or compression; the optical path requires high accuracy and complexity, and the system is unstable ; Difficult to integrate in industrial production

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