Investigations of laser-produced plasmas from boron nitride targets

The interaction of 20 ns, 3 J laser pulses with solid boron nitride targets is studied spectroscopically in the wavelength range from 30 to 300 Angstrom, and by taking pinhole pictures at shea wavelengths. The experiments were carried out for different angles of incidence of the laser beam and as a function of the depth of the hole in the target. Typical temperatures are from 22 to 45 eV. It is observed that the heating of the plasma occurs at the bottom of the hole and that the hole is along the axis of the direction of the laser beam.