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Method for improving contrast of ultrashort pulse

An ultra-short pulse, contrast technology, applied in laser parts, electrical components, phonon exciters, etc., can solve problems such as pre-ionization, affecting experimental results, target breakage, etc., to reduce the generation of ASE, laser pulse contrast The effect of increasing, increasing strength

Active Publication Date: 2012-03-07
CHONGQING INST OF EAST CHINA NORMAL UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0007] With the in-depth study of electron acceleration, advanced light source, attosecond physics, ultrafast matter, fast ignition fusion and laser nuclear physics, the focused light intensity of the target light pulse from the high-energy laser system is as high as 10 20 -10 21 W / cm 2 , although the existing technology has been able to obtain 10 -11 pulse contrast, but the focal spot intensity of the remaining pre-pulse still exceeds 10 10 W / cm 2 , such a high-intensity pre-pulse will cause the rupture and pre-ionization of the target before the main pulse reaches the target, which will affect the experimental results

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  • Method for improving contrast of ultrashort pulse
  • Method for improving contrast of ultrashort pulse

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Embodiment one: if figure 2As shown, the schematic diagram of active external cavity coherent synthesis with adjustable repetition rate and cavity emptying mode output, implementation details:

[0026] (1) The seed pulse enters the enhanced cavity from the input coupling mirror 1, and the cavity length is precisely locked by the piezoelectric ceramic controlled by the electronic circuit 6.

[0027] (2) The input pulse is focused to the nonlinear crystal 5 by the acousto-optic modulator 7 and the curved mirrors 8 and 3. Under the action of the synchronous pump pulse, a parametric process occurs and the pulse amplitude is amplified.

[0028] (3) The amplified pulse is reflected by the curved mirror 4 to the input coupling mirror 1, and coherently synthesized with the next pulse entering the cavity. The synthesized pulse is transmitted in the cavity and continues to be parametrically amplified in the nonlinear crystal. Subsequent pulses entering the cavity are coherently...

Embodiment 2

[0030] Embodiment two: if image 3 As shown, a schematic diagram of optical parametric chirped pulse amplification using Ti: S laser as a seed source and frequency division amplification technology to obtain synchronous pump light to realize active external cavity coherent combination.

[0031] Implementation details:

[0032] (1) A commercially available Ti:Sapphire laser is selected, and its output spectral range covers 650 nm to 1100 nm.

[0033] (2) Use a coated AR800 nm / HR910 nm dichroic mirror to filter out the laser output from the titanium sapphire laser whose spectral center is in the 910 nm band, enter the optical stretcher, and stretch it to the order of picoseconds as an optical parametric chirped pulse amplification process the seed pulse.

[0034] (3) Use a coated AR800 nm / HR1030 nm dichroic mirror to filter out the laser light whose spectral center is in the 1030 nm band output by the titanium sapphire laser, and use a microscope objective lens to couple i...

Embodiment 3

[0041] Embodiment three: as Figure 4 As shown, the schematic diagram of optical parametric chirped pulse amplification using Ti: S laser as the seed source and cross-absorption modulation technology to obtain synchronous nanosecond square wave to realize active external cavity coherent combination.

[0042] Implementation details:

[0043] (1) Choose a Ti:Sapphire laser with a center wavelength of 800 nm, a spectral width of 60 nm, and a repetition rate of 240 kHz.

[0044] (2) Build a half-space and half-fiber structure with an ytterbium-doped fiber laser with a repetition rate of 240 kHz, add a wavelength division multiplexer in the 800 / 1064 nm band to the fiber laser, and follow the wavelength division multiplexer with a section An erbium-doped fiber with a length of 1 m is used as the absorption medium for cross-absorption modulation.

[0045] (3) Using an 800 nm beam-splitting lens, the laser output from the Ti:Sapphire laser is divided into two parts. One part of the ...

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Abstract

The invention relates to the ultrafast laser technology field, more particularly to a method for improving a contrast of an ultrashort pulse. The method is characterized in that: an active enhanced external cavity coherent combination optical parametric amplification method is employed and the method relates to an active non-linear optical resonant cavity; the structure of the optical resonant cavity can be formed by a plurality of cavity mirrors in an annular shape or a folding shape; a non-linear crystal is arranged in the cavity to realize parametric amplification; the length of the enhanced external cavity is accurately controlled by electronic line control that is adhered to one of cavity mirrors; a repetition frequency corresponded to the length of the enhanced external cavity is locked on a repetition frequency of an input seed pulse through an electronic feedback loop. According to the method provided in the invention, it is hopeful to realize output of high energy laser, wherein the pulse contrast of the high energy laser is superior to 10-12; it is helpful for researchers to know better a process and a mechanism of mutual interaction between a laser and a substance; and a reliable and stable research tool is provided for researches on strong field laser physics and nonlinear optics.

Description

[0001] technical field [0002] The invention relates to the field of ultrafast laser technology, in particular to a method for providing ultrashort pulse contrast. The method adopts an active external cavity coherent synthesis optical parameter amplification technology to improve the ultrashort pulse contrast. Background technique [0003] Femtosecond laser pulses with high power and high repetition rate have broad application prospects in the fields of material processing, medical treatment, laser chemistry and high energy physics. The peak power of a single laser pulse has been obtained from the Q-switched technique in gigawatts (GW, 10 9 W) order of magnitude increased to terawatts (TW, 10 12 W) order of magnitude, the corresponding laser focus power density has reached 10 20 -10 22 W / cm 2 , the extreme experimental conditions of strong electric field and strong magnetic field provide a basic tool for the research of strong field physics and high energy density ph...

Claims

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Application Information

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IPC IPC(8): H01S3/10H01S3/105
Inventor 李文雪杨康文沈旭玲闫明周慧曾和平
Owner CHONGQING INST OF EAST CHINA NORMAL UNIV
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