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Ultra-short pulse laser space-time compression method based on flight focus and plasma waveguide

A technology of ultrashort pulse laser and plasma, applied in the field of laser

Active Publication Date: 2020-10-23
LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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Problems solved by technology

However, there is no report on the application of flying focus technology to space-time compression of ultrashort pulse laser

Method used

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  • Ultra-short pulse laser space-time compression method based on flight focus and plasma waveguide
  • Ultra-short pulse laser space-time compression method based on flight focus and plasma waveguide

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Embodiment

[0026] A method for space-time compression of ultrashort pulses, the steps of which are as follows: first, a chromatic aberration focusing system is used to generate a flying focus, and then a plasma waveguide is used to collect and collimate the flying focus, so that the focused laser is transmitted in the plasma waveguide, preferably through a grating Adjust the moving speed of the flying focus to be equal to the group velocity of the laser in the waveguide to obtain the time compression of the output pulse;

[0027] Specifically, as figure 1 As shown, the wavelength of the initial laser pulse 1 with chirp decreases successively from blue light a to orange light d, and after passing through the dispersion focusing system, that is, the Kepler lens group 2 with chromatic aberration material, the flying focus 4 forms a line in the propagation direction line, subsequently, the flying focal point 4 enters the plasma waveguide 8 in turn and propagates along the waveguide, and fina...

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PUM

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Abstract

The invention discloses an ultra-short pulse laser space-time compression method based on a flight focus and a plasma waveguide, and belongs to the technical field of laser. The method adopts the plasma waveguide to collect and collimate the flight focus, enables focused laser to be transmitted in the plasma waveguide, and then adjusts the moving speed of the flight focus to be just equal to the group speed of the laser in the waveguide through a grating. Due to the fact that light paths of light with different wavelengths are different, output pulses obtain a time compression effect, and meanwhile, due to the self-focusing effect of strong laser in plasma, the laser is further focused, and a space compression effect is achieved. The invention solves the problems of material damage of theexisting chirped pulse amplification technology and low stability, low efficiency and the like of the plasma compression technology.

Description

technical field [0001] The invention relates to the field of laser technology, in particular to an ultrashort pulse laser space-time compression method. Background technique [0002] At present, high-energy, ultra-short (generally refers to the pulse time width of 10 -12 -10 -15 s, that is, between 1ps-1fs), the main technical approach of ultra-intense pulsed laser is chirped pulse amplification technology, and its basic working principle is: using a stretcher (usually composed of prisms, gratings and other dispersive elements) to convert a beam The short-pulse laser is stretched in the time domain (because the instantaneous frequency at each moment is different, the stretched pulse is called a chirped pulse), and the stretched laser pulse is amplified in the amplifier to extract enough energy, and finally passed through The compressor narrows the pulse width to obtain extremely high pulse peak power. [0003] However, as the pulse power density continues to increase, the...

Claims

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Application Information

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IPC IPC(8): H01S3/00
CPCH01S3/0057
Inventor 吴朝辉左言磊曾小明王晓东王逍母杰胡必龙
Owner LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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