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Дата последнего поиска статьи во внешних источниках: 4 декабря 2015 г.
Аннотация:We demonstrate the formation of a narrow beam from a long (L λ) laser with sub wavelength transverse dimensions (wire laser) as an image of the subwavelength laser waveguide formed by a spherical lens. The beam is linearly diverging with the angle determined by the ratio of the wavelength to the lens radius, while the minimum beam spot size is the same as that of the image of a point source.We realize such a beam experimentally using a terahertz quantum cascade wire laser.