초록 ▼

A beam homogenizer that minimizes undesired intensity variations at the output plane caused by sharp breaks between facets in previous embodiments. The homogenizer includes a hologram made up of irregularly patterned diffractive fringes. An input beam illuminates at least part of the hologram. The h

A beam homogenizer that minimizes undesired intensity variations at the output plane caused by sharp breaks between facets in previous embodiments. The homogenizer includes a hologram made up of irregularly patterned diffractive fringes. An input beam illuminates at least part of the hologram. The hologram transmits a portion of the input beam onto an output plane. In doing so, the energy of the input beam is spatially redistributed at the output plane into a homogenized output beam having a preselected spatial energy distribution at the output plane. Thus, the illuminated portion of the output plane has a shape predetermined by the designer of the homogenizer.

대표청구항 ▼

[ We claim:] [1.] A diffractive element comprising:a computer-generated hologram comprising irregularly patterned diffractive fringes and having a phase-transmittance pattern in which a Fourier transform of the phase transmittance pattern is more uniform than a Fourier transform of a phase transmitt

[ We claim:] [1.] A diffractive element comprising:a computer-generated hologram comprising irregularly patterned diffractive fringes and having a phase-transmittance pattern in which a Fourier transform of the phase transmittance pattern is more uniform than a Fourier transform of a phase transmittance pattern of a lens array over a predetermined target region.