A SOURCE OF INTENSE COHERENT HIGH FREQUENCY RADIATION

摘要

A circularly polarized incident beam (50) of coherent radiation from a laser (48) is directed at a frequency multiplication medium that includes constituents (42) on a liquid helium cooled substrate (40) of approximate Cn symmetry oriented so that the symmetry axes of the constituents are parallel to the incident beam. The interaction of the incident beam and the constituents of the medium produces higher harmonics of the incident frequency, up into the x-ray band. If the Cn symmetry of the medium constituents is exact the harmonic frequencies are multiples of the frequency of the incident beam. If the Cn symmetry is only approximate the harmonics are centered around these multiples. Suitable medium constituents include dipole molecules of C5 symmetry and circular rings of nanoparticles.