System and method for generating femtosecond seed light

Abstract

The invention discloses a system and a method for generating femtosecond seed light. The system comprise a signal light source, a pumping light source, a signal light generating module and a pump light generating module, wherein the signal light generating module comprises a cross polarization wave generating device (3) and an optical parameter amplifying device (6); the pump light generating module comprises a time delay device (4) and a frequency doubling device (5); a signal light source output light beam is used as signal light (100) after passing through the cross polarization wave generating device to enter the optical parameter amplifying device; a pumping light source output light beam passes through the time delay device and the frequency doubling device to serve as pump light (200) to enter the optical parameter amplifying device; and the signal light (100) and the pump light (200) pass through the optical parameter amplifying device to generate idler frequency light (300), wherein the idler frequency light (300) is used as seed light. According to the method, cross polarization wave generation and femtosecond optical parameter amplification are combined to generate idlefrequency light which is taken as seed light, the hollow optical fibers do not need to be shaped, a vacuum system does not need to be introduced, and the device has the characteristics of being simplein structure, convenient to adjust, high in efficiency and easy to implement.

Description

technical field [0001] The invention relates to the field of ultrashort laser pulses, in particular to a system and method for generating femtosecond seed light, which improves the contrast of a chirped pulse amplification device based on cross-polarized wave generation and idler light in femtosecond optical parametric amplification. Background technique [0002] The invention of chirped pulse amplification (CPA) technology has opened up a new path for ultrashort and ultraintense lasers. Since the 1990s, CPA technology has developed rapidly. At present, many research institutions in the world have established hundreds of terawatts (TW) or even petawatts (PW) based on chirped pulse amplification technology. class laser device. Such a high peak power laser device provides humans with unprecedented experimental means and extreme physical conditions, which is conducive to in-depth study of the laws of the objective world. However, at such a high peak power, when the laser inte...

AI Technical Summary

Problems solved by technology

These technologies have their own advantages and disadvantages. For example, the saturable absorber technology is a simple and traditional method, but the ability to improve the contrast is not strong, and can only be improved by 1-2 orders of magnitude; the contrast conversion efficiency of the plasma mirror is low, and the parameters are difficult. control, and the cost is high, and the contrast is generally increased by 2-3 orders of magnitude; the technology of cross-polarized wave generation has developed rapidly in recent years. The extinction ratio, while the conversion efficiency is low, the output energy is low, and the contrast can generally be increased by 4-5 orders of magnitude; The contrast enhancement capability of optical parametric amplification technology will be limited by the amplification gain

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