Two and three dot laser produced plasma extreme ultraviolet sources have been generated using a Fourier diffractive
optical element (DOE). The DOE featured a >90% diffraction efficiency and a power handling capability of
>100 MW. The plasmas were formed on a planar bulk tin target by pulses from a Nd:YAG laser delivering up to
360 mJ per pulse in a time of 15 ns (full-width half-maximum intensity) at the fundamental wavelength of 1064
nm. After passing through the DOE, the laser beam was focused onto the target by a pair of lens. The resulting
spot radius was estimated to be 8.2±0.2 μm 1/e2 on the target. The extreme ultraviolet radiation emitted by
the plasma was imaged using a 122 μm imaging slit in conjunction with the 38 μm slit of the spectrometer. The
one dimensional image of the laser produced plasma extreme ultraviolet source, together with its spectrum, was
recorded by an absolutely calibrated Jenoptic 0.25 m EUV spectrograph. The spectrograph was located at an
observation angle of 45 degrees with respect to the target. The vacuum chamber and spectrograph were both
maintained at a base pressure of 10-6 Torr. The recorded 1D spatial distribution and EUV spectra demonstrate
the feasibility of EUV patterning by the novel optical method. The characteristics and potential applications of
this method are investigated in this paper.
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