Broadband optical parametric amplification device based on double nonlinear optical process

Abstract

The invention discloses a broadband optical parametric amplification device based on a double nonlinear optical process. The broadband optical parametric amplification device mainly comprises fundamental frequency light, signal light, a beam splitter, a beam combiner, a frequency doubling crystal, an optical parametric amplification crystal and the like. Fundamental frequency light generates pump light through the frequency doubling crystal, then parametric amplification is carried out on signal light by utilizing the pump light in the optical parametric amplification crystal, meanwhile, a beam of fundamental frequency light is incident, frequency sum is carried out on the fundamental frequency light and idle light generated in the parametric amplification process, and the idle light is consumed, so that the inverse conversion process of optical parametric amplification is inhibited; and optical parametric amplification with higher efficiency and larger bandwidth is realized. The two nonlinear optical processes of optical parametric amplification and sum frequency belong to parametric processes, the heat accumulation effect is extremely low, and the two nonlinear optical processes can be simultaneously realized in many crystal materials and in a very wide wavelength range, so that the method can be suitable for the conditions of high peak power, high average power and the like; and the method can also be applied to optical parametric amplification of different crystals and different wavebands.

Description

technical field [0001] The invention belongs to the field of laser technology, and in particular relates to a broadband optical parametric amplification device based on a double nonlinear optical process. Background technique [0002] Ultra-short and ultra-intense laser pulses can generate ultra-high peak power and ultra-strong electric field strength in an extremely short time scale, and have important applications in many frontier fields. As an alternative technology to traditional laser amplification, optical parametric amplification has many advantages such as high conversion efficiency, wide gain bandwidth, low thermal accumulation effect, high signal-to-noise ratio, and flexible frequency tuning. means. However, due to material dispersion, inverse conversion and energy backflow in the process of optical parametric amplification are the key factors restricting the gain bandwidth, conversion efficiency, pulse compression width and peak power of the laser system, especia...

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Problems solved by technology

[0005] Aiming at the technical problems faced in the current high-efficiency broadband optical parametric amplification process, the present invention proposes a broadband optical parametric amplification device based on a dual nonlinear optical process, aiming to solve the problem of gain narrowing and energy loss caused by inverse conversion in the current optical parametric amplification. Reflow problems, and overcome the limitations of material selection, crystal application conditions, applicable laser wavelength range, etc., to improve the overall performance of the optical parametric amplification system

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