Pulse self-compression system and its coupling adjustment method based on kagome hollow-core photonic crystal fiber

Abstract

The invention provides a pulse self-compressing system and a coupling adjustment method based on Kagome hollow-core photonic crystal fiber, which solves the problem that the pulse width of the existing femtosecond laser is not narrow enough to realize flexible transmission. The system includes near-infrared high-reflection mirror pairs, attenuators, focusing lenses, kagome hollow photonic crystal fibers with a protective outer layer, and a vacuum unit for adjusting the air pressure inside the kagome hollow photonic crystal fiber; The infrared high mirror pair is used to adjust the left and right direction and the high and low direction of the femtosecond laser; the attenuator is used to attenuate the power of the femtosecond laser; the focusing lens is used to adjust the divergence angle and spot size of the femtosecond laser beam; kagome hollow photon The entrance and exit ends of the crystal fiber are respectively sealed by the hollow fiber sealing head; the first hollow fiber sealing head is installed on the five-dimensional adjustment frame, which is used for the up and down, front and back, left and right translation of the kagome hollow photonic crystal fiber entrance and the height, left and right angle adjustment.

Description

technical field [0001] The invention belongs to the field of laser technology and relates to an ultrashort pulse self-compression technology, in particular to a pulse self-compression system based on a Kagome hollow-core photonic crystal fiber and a coupling adjustment method thereof. Background technique [0002] With the development of industrial femtosecond laser "cold processing" technology, attention to thermal effects in ultrafast laser processing is gradually increasing. Compared with picosecond laser processing and nanosecond laser processing, hundreds of femtosecond high-energy ultrashort pulse processing The thermal effect of the laser has been significantly reduced, but in some extreme micro-hole processing, the requirements for the thermal effect are very strict. After hundreds of femtoseconds of laser processing, there is still a recast layer caused by the thermal effect, so the narrower pulse width Femtosecond laser light sources put forward higher requirements...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the technical problem that the pulse width of the existing femtosecond laser is not narrow enough to achieve flexible transmission, the present invention provides a pulse self-compression system and coupling adjustment method based on Kagome hollow-core photonic crystal fiber

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