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A method to improve the signal-to-noise ratio of high-energy short-pulse laser

A short-pulse laser and signal-to-noise ratio technology, applied in optics, nonlinear optics, instruments, etc., can solve the problems of high-energy short-pulse laser signal-to-noise ratio inefficiency, difficult debugging, etc., to achieve reduced adjustment difficulty, low cost, high efficiency effect

Inactive Publication Date: 2017-02-01
LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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Problems solved by technology

[0005] In view of the above shortcomings, the efficiency of improving the signal-to-noise ratio of high-energy short-pulse laser is low, and the debugging is difficult. The present invention provides a method for improving the signal-to-noise ratio of high-energy short-pulse laser

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  • A method to improve the signal-to-noise ratio of high-energy short-pulse laser
  • A method to improve the signal-to-noise ratio of high-energy short-pulse laser
  • A method to improve the signal-to-noise ratio of high-energy short-pulse laser

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Embodiment Construction

[0035] The central wavelength λ of the main peak of the high-energy short-pulse laser pulse in this embodiment 0 800nm, energy 6mJ, beam aperture 10mm, pulse width 50fs; the material of the nonlinear optical medium is K9 glass, and the nonlinear refractive index coefficient is n 2 =3.75×10 - 16 cm 2 / W. Calculate the peak power density I of the pulse main peak 0 =153GW / cm 2 by the formula Determine the thickness of the K9 glass to be 14mm.

[0036] like figure 1 Shown is a schematic diagram of the optical path structure of a method for improving the signal-to-noise ratio of high-energy short pulses in the present invention. As shown in the figure, the high-energy short-pulse laser 1 first shoots into the half-transparent half-reflective film of the first half-mirror 2, and then It is divided into two beams, including the first sub-beam 10 as a reflected beam, the second sub-beam 11 as a transmitted beam, and the second sub-beam 11 is emitted through the high-transmitt...

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Abstract

The invention discloses a method for increasing a signal-to-noise ratio of high-energy short-pulse laser. The method is characterized in that the high-energy short-pulse laser is divided by a first semi-transparent semi-reflection mirror into two beams, wherein one beam of the laser has nonlinear phase shift related to the intensity through a nonlinear optical medium, the other beam is synchronous with the previous beam through a delay optical path, and then the two beams are combined through a second semi-transparent semi-reflection mirror. The nonlinear phase shift is controlled by calculating the length of the nonlinear optical medium through the peak power density of a pulse main peak, so that the laser beam pulse main peak coherent phase outputted by the second semi-transparent semi-reflection mirror is increased, the noise coherent phase is reduced, and the signal-to-noise ratio is increased.

Description

technical field [0001] The invention belongs to the field of high-energy short-pulse lasers, and in particular relates to a method for improving the signal-to-noise ratio of high-energy short-pulse lasers. Background technique [0002] The development of high-energy short-pulse laser devices has opened up a new research field for the study of the interaction between laser and matter. Before the main peak of the pulse arrives, the pre-pulse may interact with the target to generate pre-plasma. Theoretical studies have shown that pre-pulse strengths over 10 8 W / cm 2 , the pre-plasma produced by its interaction with the solid target is sufficient to cause detrimental changes in the target, so that the main peak of the pulse cannot interact with the target as expected. Therefore, it is of great significance to suppress the pre-pulse and improve the signal-to-noise ratio of the pulse. [0003] There are several common methods to improve the pulse signal-to-noise ratio: one is ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/35
Inventor 张颖黄晚晴耿远超王文义刘兰琴孙立谢娜王晓东
Owner LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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