Abstract
A technique of focusing the heating radiation wasinvestigated, which makes it possible to produce an extended(under laboratory conditions, up to 1 m and over) plasmacolumn and enables an easy output of VUV radiation. A planesolid-state target in vacuum was arranged along the caustic ofa conic lens (axicon), which focused the laser beam. An analytic dependence, which describes the spatial intensity distribution of the heating radiation in the case of a nontransparent, partially reflecting target, was derived and experimentally verified. Experiments on the irradiation of an aluminiumtarget in vacuum with a 5-J, 5-ns pulse of a neodymium-glasslaser were performed. A plasma column up to 30 mm in lengthand no greater than 10 μm in diameter was formed. A ratherintense plasma radiation was recorded in the VUV range.
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