As one of the most important scientific inventions of the 20th century, laser has directly promoted the development of a number of new disciplines and high-tech, such as nonlinear optics, laser spectroscopy, strong field physics, optical communication, Optical information storage, burning laser pointer chemistry, laser medicine, laser biology, laser fusion, laser separation isotope, laser holography, laser processing and so on. At the same time, laser technology has also entered the people's daily lives, such as CD players, VCD players, supermarket cash register bar code scanner, laser printers, all without using advanced laser technology. The development of laser technology has opened up the application of laser technology, laser technology has promoted the further development of laser science and technology.
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Super high power and power density (the power per unit area), a laser system can even produce up to 1015 watts of peak power, and the world's average power grid is only 1012 watts of magnitude; Short time scale, the shortest laser pulses, but a few femtoseconds (10-15 seconds), the light within a femtosecond only spread 0.3 micron.
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In recent years, the rapid development of new miniaturization superfast ultrafast laser technology has provided a new experimental means and extreme physical conditions for mankind. The extreme physical conditions created in the lab are still only found in nuclear explosions, inside stars, or at the edges of black holes. In today's ultra-fast laser pointer technology has been provided and because of its further development can provide increasingly strong and faster light field conditions, the laser and the interaction between the various forms of material, will enter into An unprecedented high degree of nonlinear and relativistic dominance of the strong field of ultra-fast range, and further the light and material interaction research into a deeper material levels, and even light and vacuum interaction, which created a super Ultra-fast laser new frontiers of modern science and technology in this field.
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At present, ultra-short pulses of high repetition frequency (usually 10-13 seconds or less) have been produced on benchtop laser systems that are much smaller than conventional devices. The laser output is too much or even higher. The intensity of the focused laser light has increased by five to six orders of magnitude over the last decade to 1019 to 1020 W / cm2. Soon, it will reach a record of 1021 watts / cm 2, thus creating a laboratory-scale extreme physical conditions. 1021 W / cm 2, the resulting local electric field will be as high as 1012 V / cm, equivalent to hydrogen atoms of the first Bohr orbital Coulomb field of 170 times; the corresponding magnetic field will reach 105 special super range; The corresponding energy density has been in the 3 × 1010 coke / cm 3 above, and the temperature of 10 keV blackbody energy density equivalent; the same time, will produce a huge light pressure, close to 1017 Pa. In such a high power laser pointer field, the vibrational energy of electrons will be higher than 10 meV (1.06 microns for a laser), much higher than the electron's own quiescent mass (0.5 meV), and the electron acceleration will reach 1022 m / Sec 2, that is, 1021g (gravitational acceleration) of the order of magnitude, highly nonlinear and relativistic effects have become dominant.
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Early studies in this field have shown that the interaction of strong field lasers with atoms and molecules leads to new phenomena such as tunnel ionization, barrier inhibition ionization, high order odd harmonics, stabilization and phase control of molecules and Coulomb explosions. The conventional perturbation method applied to nonlinear problems has been replaced by non-perturbation theory. At present, the interaction between superfast and ultrafast lasers has entered a new stage where the relativistic effect plays a dominant role, so that the Dirac equation must be used to deal with the dynamic behavior of the interaction. On the other hand, the laser pulse obtained today has been less than 10 femtoseconds, as short as 4 femtoseconds, and contains only 1.5 photoperiods (for a wavelength of 800 nm laser). Strictly speaking, at this time the light pulse is not a "light wave", the loss of the cyclical characteristics of the unique phenomenon. The traditional theory of the interaction of longer pulse width with matter is no longer applicable, thus creating a new theory of extreme non-linear interaction. Cycle and even sub-cycle pulse super-fast ultra-fast green laser pointer and the interaction of various forms of material will also lead to a series of new physical phenomena and laws. Seeking these new phenomena, new laws, the establishment of new concepts related to the new theory becomes a looming research task, is the international super-fast ultra-fast laser science research field for the focus.
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Ultrafast ultrafast laser technology also provides innovative means and methods for the development of cutting-edge interdisciplinary disciplines such as ultrafast chemical kinetics, microstructure materials science, ultrafast information photonics and life sciences. For example, superfast ultrafast laser itself and its interaction with the material to produce femtosecond may even be sub-femtosecond, a second order of magnitude XUV and X-ray ultra-fast ultra-fast coherent light source technology for human research and application of various ultra- Fast process provides a powerful means, will enable the human at a deeper level to further understand the micro-world material within the energy transfer and information transfer process, and thus may realize the manual control of some physical, chemical and biological processes, microstructure materials science, Ultrafast chemical kinetics and other interdisciplinary fields of research and development, have a significant impact on the breakthrough cross cutting-edge research.
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The interaction between super-fast ultrafast 400mw laser pointer and clusters, high temperature and high density plasma and free electrons has also become a new research direction, which not only greatly broadens the depth of development of the subject area, but also will be related to the important high-tech The field of innovation and development to provide new programs and new ways.
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Recently, experimental studies have observed the "hollow" atoms of electron configuration reversal with multiphoton-excited holes, which will provide a new way to realize the ultra-short wavelength coherent radiation. The ultrafast ultrafast laser and The interaction of large-sized clusters of atoms has led to the first successful fusion of the desktop, so as to "desktop" fusion of new concepts pointed out the prospects. In addition, the study of the interaction between ultrafast and ultrafast lasers is likely to serve as a bridge to help people understand the interaction between light and matter more intactly.

In recent years, the interaction between superfast ultrafast laser and high temperature and high density plasma, especially the new nonlinear phenomenon caused by relativistic effect and the new law, has also aroused the high attention of international academic circles. Although ultra-fast ultra-fast 300mw laser pointer have been observed to produce a huge pressure, to promote the critical density of the forward movement, thus forming a plasma channel and other new phenomena, but involves 1018 ~ 1020 watts / cm 2 super-fast ultra-fast laser and high temperature The interaction of high-density plasma, such as the "perforation in plasma" effect, the generation of superheat electrons, the control and transport of energy spectrum, and other fundamental physics problems have yet to be further studied. Obviously, the study of the interaction between super-fast laser and high-temperature high-density plasma is not only an important research content in this field, but also may provide a basis for the development of related high-tech fields such as laser fusion.

The study on the high harmonic emission in the ultrafast ultrafast laser field has made a great breakthrough, and the higher harmonics have entered the "water window" band. At present, the study of new concepts and new methods of producing ultra-fast coherent radiation of sub-femtosecond and even sub-second order of magnitude is becoming more and more active. In the short wavelength X-ray laser research, the existing X-ray laser mechanism can not achieve a breakthrough wavelength of less than 2 nm, the emergence of ultra-fast ultra-fast 30mw laser pointer to achieve a new mechanism based on the inner shell transition of short-wavelength coherent radiation provides possibility. At present, the research on the new mechanism of the ultra-short wavelength coherent radiation of the ultra-fast ultra-fast laser-driven inner shell photoionization has become a new hotspot in this field.

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