Optical: systems and elements – Polarization without modulation – Polarizarion by dichroism
Reexamination Certificate
2006-03-28
2006-03-28
Boutsikaris, Leonidas (Department: 2872)
Optical: systems and elements
Polarization without modulation
Polarizarion by dichroism
C359S485050, C372S106000
Reexamination Certificate
active
07019902
ABSTRACT:
An optical system for reforming a laser beam with azimuthal polarization having X and Y components into a beam with linear polarization has a multiplicity of optical elements, at least one of which has a mirror having an absorbing thin film reflective coating to remove the Y-component of the azimuthal beam polarization, thereby reflecting only the X or linear component as a linearly polarized beam. The absorbing thin film reflective coating is comprised of a plurality of layers alternately having high and low indices of refraction. The optical elements include a spatial filter and the beam is passed through the spatial filter to adjust the beam quality. At least one other optical element is collimating and the beam with adjusted beam quality is transmitted to the collimating element to effect its collimation. The collimated linearly polarized laser beam may thereafter be passed through a phase shifter to convert the polarization of the laser beam from linear to circular.
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II-VI INCORPORATED, Coating Design Code ATFR Absorbing Thin Film Reflector, Revised May 1997.
Gary Herrit et al, “Mirror Measures Laser's polarization”, Nov. 2000 Industrial Laser Solutions, Technology Review.
Deile Jochen
Schulz Joachim
Boutsikaris Leonidas
Trumpf Inc.
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