Laser plasma optical device and method for generating ultra-short and ultra-strong mid-infrared pulses

Abstract

The invention discloses a laser plasma optical device. The laser plasma optical device comprises a laser system, a vacuum target chamber, a gas target generating device and a focusing element, whereinthe laser system is used for outputting a driving light pulse and a signal light pulse; the gas target generation device is used for generating gas and forming a required plasma channel target through capillary high-voltage discharge ionization (or laser picosecond pre-pulse ablation) gas; a drive light pulse is focused onto the generated plasma channel target by a focusing element, and then a density-modulated plasma wake is generated; and after a delay of a predetermined time T, the signal light pulse is focused to a leading edge region of a second plasma density cavity of the plasma tail wave through a focusing element, so the frequency of the signal light pulse is subjected to red shift, an ultra-strong near-single-cycle intermediate infrared pulse is generated, the intermediate infrared pulse cannot be achieved by a traditional optical device at present, and the optical device has potential wide application value for basic scientific research, medical and industrial application and the like.

Description

technical field [0001] The invention relates to the fields of laser plasma physics and nonlinear optics, in particular to a plasma optical device driven by an ultrashort pulse intense laser and a device for generating mid-infrared light pulses with single pulse energy reaching several millijoules, relativistic intensity, and near single period method. Background technique [0002] Laser pulses in the mid-infrared band (3-20 [μm] microns) have important application values ​​in basic scientific research, biomedical applications, and precision manufacturing. Because the spectrum of this band covers a large number of characteristic oscillation modes of organic molecules, it can generate characteristic oscillation absorption spectra, so it has unique diagnostic identification and manipulation research capabilities. In particular, the generation of ultra-short and ultra-intense mid-infrared laser pulses has brought important research methods to scientific research, such as the re...

AI Technical Summary

Problems solved by technology

However, the efficiency of mid-infrared pulses generated by pulse self-modulation and self-compression is very low (generally less than a few percent), the spectral tunability is poor, and it is a continuous ultra-wide spectrum

In addition, the incident laser pulses need to reach hundreds of terawatt-level powers and single pulses can reach joule-level energy, which will require large and expensive laser devices

At present, only some medium and large laboratories have such laser devices, and their operating repetition frequency is generally only a few hertz, and the stability is relatively poor

These greatly limit the practical use, application value and scope of the mechanism scheme

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