Stable high-contrast femtosecond laser pulse source

Abstract

A stable high-contrast femtosecond laser pulse source comprises a pumping source, a spectrum broadening system, a laser pulse purification system, a parametric amplification system and a dispersion compensation system. The pulse is subjected to shaping filtering through hollow optical fibers, to pulse purification through a cross polarized wave generating device, to optical parametric amplification and pulse compression, finally, the output of the high-contrast femtosecond laser pulse is achieved. According to the high-contrast femtosecond laser pulse source, not only the problem of the serious damage to crystals due to cross polarized waves under large energy is avoided, but also the stable output of the high-contrast femtosecond laser pulse during long working time is achieved. The stable high-contrast femtosecond laser pulse source is widely applicable to attosecond pulse generation and the like.

Description

technical field [0001] The invention relates to ultrashort laser pulses, in particular to a stable high-contrast femtosecond laser pulse seed source. The device amplifies the low-energy high-contrast femtosecond laser pulses generated by cross-polarized waves through an optical parameter amplification process, and then compensates and compresses them to achieve long-term stable output of high-contrast ultrashort laser pulses. Background technique [0002] With the rapid development of laser technology, the focus power density of high-power laser systems has reached >10 22 W / cm 2 , which may reach >10 in the near future 25 W / cm 2 , at such extreme intensities, the time-domain contrast of ultra-intense and ultra-short laser pulses has become a key factor in cutting-edge research such as high-field laser physics. The time-domain contrast of ultra-intense and ultra-short laser pulses is defined as the ratio of the intensity of the main pulse to the intensity of other s...

AI Technical Summary

Problems solved by technology

Saturable absorber technology is a simple and traditional method, but the ability to improve contrast is not strong

Double-chirped pulse amplification technology can effectively improve the contrast, but the cost is high and the structure is more complicated

The cross-polarized wave generation technology has a simple structure, is easy to use, and can generate broadband ultrashort laser pulses, but the contrast improvement is limited by the extinction ratio of the polarizer, which cannot meet the higher contrast required by the future higher focusing power density, and is very Linear crystals need to work at a higher power density, are easy to be broken during the work process, and have poor long-term work stability

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