Intermediate range intensity modification of gaussian beam using optical integration means
First Claim
1. Optical projection apparatus comprising:
- a multi-element source projecting a beam having a generally Gaussian intensity distribution along an optical axis towards an output plane;
a rod of optically transmitting material disposed coaxially with the optical axis, the rod having an entrance face and an exit face;
an objective lens disposed between the rod exit face and the output plane, said objective lens having a given focal length; and
optical means for moving the image of the rod entrance face that would otherwise be created between the lens and the output plane to a position between the rod exit face and the lens;
whereby the intensity of the beam projected along the optical axis from the exit face to the output plane has a generally uniform intensity throughout the length of the projected beam.
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Accused Products
Abstract
An optical projection apparatus is disclosed for generating a planar light beam of substantially uniform intensity from a nonplanar multi-element light source 10 projecting a beam having a generally Gaussian intensity distribution. Light from the source 10 passes through an optical integrator rod 52 having a faceted entrance face 54 and a spherical exit face 50. The spherical exit face 50 is designed to move the image 42 of the rod entrance face that would otherwise be created between the objective lens 14 and output plane 40 to a position 48 between the lens 14 and the exit face 50. In such manner, localized hot spots which may be created by the image 42 of the entrance face are substantially eliminated thereby ensuring that the entire length of the beam between the lens 14 and output plane 40 has a substantially uniform intensity distribution.
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Citations
11 Claims
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1. Optical projection apparatus comprising:
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a multi-element source projecting a beam having a generally Gaussian intensity distribution along an optical axis towards an output plane; a rod of optically transmitting material disposed coaxially with the optical axis, the rod having an entrance face and an exit face; an objective lens disposed between the rod exit face and the output plane, said objective lens having a given focal length; and optical means for moving the image of the rod entrance face that would otherwise be created between the lens and the output plane to a position between the rod exit face and the lens; whereby the intensity of the beam projected along the optical axis from the exit face to the output plane has a generally uniform intensity throughout the length of the projected beam. - View Dependent Claims (2, 3, 4, 5)
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6. Optical projection apparatus for projecting a light beam of substantially uniform intensity along an optical axis towards an output plane, said apparatus comprising:
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a multi-element, nonplanar source of light projecting a beam along the optical axis towards the output plane; a rod of optically transmitting material having its length disposed coaxially with the beam projected from the source, said rod having a substantially rectangular cross section throughout its length between an entrance face and an exit face, said entrance and exit faces having different geometric configurations adapted to effectively invert the intensity of the beam entering the entrance face thereby producing a beam at the exit face in the form of a plane source of forwardly directed light; an objective lens disposed between the rod exit face and the output plane; and optical means formed in the rod for moving an image of the entrance face that otherwise would be created between the lens and the output plane to a position between the rod exit face and the lens; whereby the beam projected between the rod to the output plane has a substantially uniform intensity throughout its entire length. - View Dependent Claims (7, 8, 9, 10)
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11. Optical projection apparatus comprising:
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a nonplanar laser diode array projecting a beam along an optical axis to an output plane; a quartz rod having a generally rectangular cross sectional area, a faceted entrance face and a spherical exit face; an objective lens disposed between the rod exit face and the output plane, said lens having a given focal length; and said rod exit face having a sufficient radius to image the rod entrance face at a location substantially coinciding with the front focal length of the objective lens; whereby the beam projected from the exit face of the rod to the output plane has a substantially uniform intensity distribution throughout its length.
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Specification