High-contrast femtosecond laser generating device

Abstract

The invention provides a high-contrast femtosecond laser generating device comprising a first optical parallel moving table and a first optical parameter crystal. The first optical parallel moving table is suitable for controlling the optical path difference between a first signal light and a first pump light, so as to achieve the time synchronization of the first signal light and the first pump light; and the first optical parameter crystal is suitable for receiving the first signal light and the first pump light which are in time synchronization, carrying out optical parameter enlargement, and outputting a first enlarged signal light. The high-contrast femtosecond laser generating device further comprises a second optical parallel moving table and a second optical parameter crystal, the second optical parallel moving table is suitable for controlling the optical path difference between the first enlarged signal light and the second pump light, so as to achieve the time synchronization of the first enlarged signal light and the second pump light; the second optical parameter crystal is suitable for receiving the first enlarged signal light and the second pump light which are in time synchronization, carrying out optical parameter enlargement, and outputting a second enlarged signal light. The generating device provided by the invention can improve the contrast and the optical parameter enlargement efficiency of the femtosecond laser and increase parameter bandwidth in the process of the optical parameter enlargement.

Description

technical field [0001] The invention relates to the field of laser technology, in particular to a high-contrast femtosecond laser generating device. Background technique [0002] In the past two decades, ultra-short and ultra-intense lasers have been widely used in many fields such as basic science, national security, and industrial processing. [0003] Generating high-quality ultra-short and ultra-intense laser pulses has become a goal pursued by scientists from all over the world. Chirped Pulse Amplification (CPA) is a commonly used and effective means to generate ultra-short and ultra-intense laser pulses. However, in the chirped pulse amplification process, due to the limitation of the extinction ratio of the selected elements 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. In a general CPA laser system, if no other ...

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Problems solved by technology

Although OPCPA can improve the contrast of the pulse, since the pulse width of the signal light used is on the order of hundreds of picoseconds, and the pulse width of the pump light is generally on the order of nanoseconds, there are still parameters within the time scale of hundreds of picoseconds. Fluorescence, which affects the contrast of the pulse

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