High-contrast femtosecond laser pulse generation device

Abstract

The invention provides a high-contrast femtosecond laser pulse generation device which comprises a first optical parameter crystal which is used for receiving first signal light and first pump light, amplifying an optical parameter and outputting first idler frequency light. Selectively, the high-contrast femtosecond laser pulse generation device further comprises a second optical parameter crystal which is used for receiving second signal light and second pump light, amplifying an optical parameter and outputting second idler frequency light. The second signal light is the first idler frequency light. Selectively, the high-contrast femtosecond laser pulse generation device further comprises a third optical parameter crystal which is used for receiving third signal light and third pump light, amplifying an optical parameter and outputting third idler frequency light. The third signal light is the second idler frequency light. On one hand, the contrast of a femtosecond laser and amplifying efficiency of the optical parameter are improved, and on the other hand, the amplified parameter bandwidth in the optical parameter is also increased.

Description

technical field [0001] The invention relates to the field of laser technology, in particular to a high-contrast femtosecond laser pulse generating device. Background technique [0002] High-power and high-quality ultra-short and ultra-intense laser pulses are important tools for studying inertial confinement fusion, high energy density physics, and simulating the state of celestial bodies based on fast ignition technology solutions. The contrast of laser pulses is the key to ensure the best research results Parameters, for example, in physical experiments of the interaction between ultrashort and ultraintense lasers and matter, the peak power density of the laser used after focusing is generally higher than 10 17 W / cm 2 , if the intensity of the pulse front exceeds 10 11 W / cm 2 , so that the ASE or pre-pulse begins to generate the pre-plasma before the main laser interacts with the matter. The existence of pre-plasma changes the initial state of laser-matter interaction ...

AI Technical Summary

Problems solved by technology

However, in the chirped pulse amplification process, due to the limitation of the extinction ratio of the selection element and the spontaneous emission effect (Amplified Spontaneous Emission, ASE) in the amplification process, there is inevitably background noise, which leads to a decrease in the contrast of the laser pulse.

[0004] In a general CPA laser system, if no other technology to improve the contrast is adopted, the contrast of the final output laser is only 10 5 -10 6 It is far from satisfying the research of laser nuclear fusion, high energy density, etc.

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