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The filamentation of ultrashort laser pulses [1] attracts considerable interest due to its potential applications in remote sensing technologies, free space communications as well as weather diagnostics and modulation systems. They generate a plasma wake that modifies the physico-chemical properties of the air, allowing the condensation of aerosol particles in sub-saturated air. [2,3] This phenomenon...
Two methods of filamentation control for remote applications were studied. The first one consisted in an adaptive optic system, implemented in a specially designed focusing beam expander, which corrected for wavefront aberrations. Using this setup we are able to generate extraordinarily strong nitrogen signals at a distance as far as 90 m using 40 mJ laser pulses. Moreover, the filaments produced...
We report two remote sensing experiments of aluminum in the winter time and trace methane in the summer time using the mobile femtosecond laser facility T&T (Terawatt & Terahertz) designed by the Defence R&D Canada-Valcartier (DRDC-Valcartier). This system is similar in many respects to Teramobile, the Franco-German laser system. In the first experiment, we demonstrated the feasibility...
A femtosecond laser filament can induce birefringence in an isotropic medium. This birefringence leads to the generation of elliptically polarized THz pulses emitting from a single-color/two-color filament in air.
The clamped intensity of a plasma-filament induced by a femtosecond laser pulse in one-atmospheric-pressure helium was measured. The measured electron density of ∼7×1017cm−3 corresponds to a clamped intensity of about 7.8×1014W/cm2.
The clamped intensity of a plasma-filament induced by a femtosecond laser pulse in one-atmospheric-pressure helium was measured. The measured electron density of ~7times1017cm-3 corresponds to a clamped intensity of about 7.8times1014W/cm2.
Tunable and stable ultrashort laser pulses in the visible spectrum are generated with high efficiency by four-wave mixing process during the filamentation of near-infrared and infrared laser pulses in gases.
We present a spectroscopic way to measure the plasma density of femtosecond laser filaments in air by using Stark broadening of the oxygen atomic fluorescence line. This method could also be applied to multiple filamentation.
R-FIBS is used for probing salt water aerosol. We demonstrate experimentally that it can be used to sense ppm level concentrations up to 70 m away and shows potential for kilometer range applications.
We present a spectroscopic way to measure the plasma density of femtosecond laser filaments in air by using Stark broadening of the oxygen atomic fluorescence line. This method could also be applied to multiple filamentation.
Tunable few-cycle laser pulses in the visible spectrum are efficiently generated by four wave mixing process during the filamentation in air. The mode quality and energy stability were exceptional.
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