Device for generating high signal-to-noise ratio pulse based on frequency-doubling type cascading chirped pulse amplification

A high signal-to-noise ratio, pulse technology, applied in the laser field, to achieve the effect of strong purification ability, high purification efficiency and scalable pulse energy

Inactive Publication Date: 2010-10-20
FUDAN UNIV
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Problems solved by technology

[0004] Aiming at the deficiencies of the existing nonlinear short pulse purification technology, the purpose of the present invention is to provide a devic...

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  • Device for generating high signal-to-noise ratio pulse based on frequency-doubling type cascading chirped pulse amplification
  • Device for generating high signal-to-noise ratio pulse based on frequency-doubling type cascading chirped pulse amplification
  • Device for generating high signal-to-noise ratio pulse based on frequency-doubling type cascading chirped pulse amplification

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Embodiment Construction

[0015] Further describe the present invention below in conjunction with accompanying drawing.

[0016] figure 1 Shown is a high signal-to-noise ratio near-infrared light pulse generating device designed according to the present invention. The device includes a mid-infrared OPCPA system with a freely designable wavelength, a frequency doubling pulse purification system, and a near-infrared neodymium glass amplification system. in:

[0017] In the mid-infrared OPCPA system, the femtosecond laser 3 emitted by the pump femtosecond laser source 1 passes through the first nonlinear crystal 4 satisfying a positioning matching angle, and performs an optical parametric generation (OPG) process, thereby obtaining the mid-infrared femtosecond laser 6 . Then, under the action of the first dichroic mirror 5, the mid-infrared femtosecond laser 6 is separated from the remaining femtosecond pump light 7 to remove unnecessary stray light generated during the OPG process. After the remaining...

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Abstract

The invention belongs to the technical field of laser, in particular to a device for generating high signal-to-noise ratio optical pulse. The device mainly consists of a multi-level chirped pulse amplification part and a pulse frequency-doubling purification part, wherein each level of chirped pulse amplification system respectively operates in different wavelengths (namely fundamental wave and harmonic wave); and non-linear purification of the pulse and conversion matching of the wavelengths can be realized through the frequency-doubling process between the fundamental wave and the harmonic wave, so as to obtain the high signal-to-noise ratio pulse. The device has the advantages of strong pulse purification ability, high overall efficiency and favorable expansibility performance towards a heavy calibre high energy state, and can be used for constructing laser systems of the petawatt magnitude.

Description

technical field [0001] The invention belongs to the field of laser technology, and in particular relates to a device for generating light pulses with high signal-to-noise ratio. Background technique [0002] The development of high-intensity femtosecond chirped pulse amplification laser system provides the possibility to carry out experimental research on the interaction between light and matter under extreme relativistic physical conditions. At present, high-power lasers have reached a focused light intensity of 10 22 W / cm 2 , in order to prevent the pulse sidelobe from generating pre-plasma, the signal-to-noise ratio of the laser pulse is required to be at least greater than 10 11 : 1, especially at the leading edge of the pulse. As the focused laser intensity continues to increase, the requirements for the signal-to-noise ratio are further enhanced. In order to solve this bottleneck problem in the chirped pulse amplification laser system, a variety of methods for impr...

Claims

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Application Information

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IPC IPC(8): H01S3/00G02F1/37G02F1/39H01S3/23
Inventor 钱列加袁鹏张东方钟亥哲
Owner FUDAN UNIV
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