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Extremely strong‐field terahertz (THz) radiation in free space has compelling applications in nonequilibrium condensed matter state regulation, all‐optical THz electron acceleration and manipulation, THz biological effects, etc. However, these practical applications are constrained by the absence of high‐intensity, high‐efficiency, high‐beam‐quality, and stable solid‐state THz light sources. Here,...
In this paper, we propose a blob-based method of crowd counting across a line of interest(LOI), which can be further extended to counting inside a region of interest(ROI). Firstly, we detect moving blobs in which low-level features are extracted and grouped. Since features vary with different walking pace, blob velocity is estimated using optical flow, and principal velocity component is further extracted...
We demonstrated the generation of broadband 800nm laser pulse with a BiB3O6 based OPA followed by a SHG process. The achieved pulses are with spectrum of 53.3nm (FWHM) and pulse width of 18.6fs.
In this study, 35.5% conversion efficiency is obtained at the first Stokes component frequency (873nm) upon two-stage chirped pulse Raman amplification in a Ba(NO 3 ) 2 crystal by an 8mJ, 620ps, 800nm pump laser. A maximum energy of 4.22mJ with 3.82% rms stability at the first Stokes pulse can be obtained under 35mJ pump energy. Moreover, the chirped first Stokes pulse can be compressed...
We predict and observe the formation of a compact surface bound state in the continuum due to an optical Fano resonance. We employ a one-dimensional array of optical waveguides with an additional side-coupled waveguide inducing the resonance, and prove that the localized mode amplitude vanishes completely at all locations beyond the resonant waveguide.
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