Restoration of Gas Dynamics on Laser Filamentation at High Repetition Rates
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We demonstrate that thermal effects limiting femtosecond laser filamentation in gases can be addressed using a simple gas replenishment method. This enables high average power filamentation applications like THz sources.Keywords:
Filamentation
Limiting
Nonlinear interactions of a focused femtosecond laser with water can provide interesting optical phenomena. We observed intense scattered lights with multicolors at the surface of microbubbles formed by a focused femtosecond laser inside the water. This optical scattering phenomenon is found, to the best of our knowledge, for the first time since the invention of the femtosecond laser. The bubbles are formed rapidly before the emissions of colorful sparkling lights at a back-side point of water-vapor interface of the microbubbles. Analysis of the nonlinear optical processes, particularly spectral blueshift and broadening with filamentation hot spots in the water, explains the effect of multispectral scattering. This work may provide a new method for visualizing the filamentation hot spots and the corresponding frequency components in the focusing region by making use of the strong scattering at the water-vapor interface of the microbubbles.
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Blueshift
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This paper reviews the recent studies of filamentation of femtosecond lasers pulses in air in the Institute of Physics, Chinese Academy of Sciences. The filamentation mechanisms of free propagated femtosecond laser pulses, effect of air turbulence on the filamentation, interaction between filaments are presented.
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We study the characteristic conical emission of a blue femtosecond filament in air. A significant improvement of the beam quality is obtained during the filamentation process.
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Ultrafast optics
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Chirp
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A simple model of multiple filamentation of single femtosecond laser pulses in LiF was obtained on the basis of a nonlinear Schrödinger equation. The results of a computer simulation were compared with experimentally observed fluorescent traces of filaments in LiF.
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The influence to filamentation of femtosecond by atmospheric turbulence at wavelength of 400 nm has been studied numerically. Simulations show that the distance of filamentation at 400 nm is advanced, the number of filaments increases, and the energy of filaments decreases with the addition of turbulent screen. Compared with the filaments formed by the 800 nm femtosecond laser, the nonlinear propagation of 400 nm laser has a longer filamentation distance in the turbulent atmosphere, and the clamping light intensity of the filaments is higher, but the number of filaments has reduced. With the increase of propagation distance, the multifilament structure disappears and the beam gradually converges into a stable monofilament structure. The position of the monofilament structure at 400 nm is closer than the 800 nm. Therefore, stable filament structure can be obtained more easily with a femtosecond laser at 400 nm.
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Supercontinuum
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The possibility of the influence of thermal effects on the formation of color centers during laser femtosecond filamentation in a LiF crystal has been investigated theoretically. The conditions are formulated under which the influence of thermal effects can be noticeable.
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Crystal (programming language)
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