Pulse self-compression system based on Kagome hollow photonic crystal fiber and coupling adjustment method of pulse self-compression system
A hollow photonic crystal and compression system technology, applied in the laser field, can solve problems such as insufficient pulse width and inability to achieve flexible transmission, and achieve the effects of simple structure, low cost, and high adjustment accuracy
Active Publication Date: 2020-11-20
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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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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[0052] The content of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0053] The output pulse width of existing femtosecond lasers is limited by the emission spectral width of the gain medium, and the output pulse width is generally in the range of hundreds of femtoseconds to one picosecond. In order to further compress the pulse width, high-energy ultra-short The pulse output meets the requirements of high-precision industrial cold processing under extremely harsh conditions for the pulse width of laser light sources and the requirements of high-energy physics for the limit pulse width. The present invention designs a pulse self-compressing system based on Kagome hollow photonic crystal fiber and its coupling adjustment method.
[0054] like figure 1 As shown, a pulse self-compression system based on the Kagome hollow-core photonic crystal fiber defines the outgoing direction of the fem...
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Abstract
The invention provides a pulse self-compression system based on a Kagome hollow photonic crystal fiber and a coupling adjustment method, and solves problems that an existing femtosecond laser is not narrow enough in pulse width and cannot realize flexible transmission. The system comprises a near-infrared high-reflectivity mirror pair, an attenuator, a focusing lens, a kagome hollow photonic crystal fiber with a protective outer layer and a vacuum unit for adjusting air pressure of an air cavity in the kagome hollow photonic crystal fiber which are sequentially arranged from left to right. Thenear-infrared high-reflectivity mirror pair is used for adjusting a femtosecond laser in a left-right direction and a height direction; the attenuator performs power attenuation on the femtosecond laser; the focusing lens is used for adjusting a divergence angle of a femtosecond laser beam and the size of a light spot; an inlet end and an outlet end of the kagome hollow photonic crystal fiber aresealed through hollow fiber sealing heads respectively; and a first hollow fiber sealing head is mounted on a five-dimensional adjusting frame and is used for translating the inlet end of the kagomehollow photonic crystal fiber up and down, front and back and left and right and adjusting the height and left and right angles.
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...
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Patent Timeline
Login to View More IPC IPC(8): H01S3/067H01S3/10H01S3/102H01S3/105H01S3/106
CPCH01S3/06741H01S3/10015H01S3/102H01S3/105H01S3/106
Inventor 李峰赵卫杨小君王屹山杨直王娜吕志国温文龙李强龙杨洋
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI