Coherent light generators – Particular beam control device
Patent
1995-02-23
1995-12-19
Scott, Jr., Leon
Coherent light generators
Particular beam control device
372108, 372 7, 372 98, H15
Patent
active
054775540
ABSTRACT:
A phase shift device for a laser beam has a circular first area transparent so the laser beam and a second area provided around the first area and transparent to the laser beam. The first and second areas generate a phase difference for example 180.degree. in the passing light beams. The phase shift device is positioned for example at a beam waist of a laser scanning apparatus to form a beam spot of a diameter smaller than that defined by the numerical aperture of the imaging optical system. Structure of a laser apparatus employing such phase shift device is also disclosed.
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Osawa Hiroshi
Saito Kenji
Suzuki Masayuki
Yoshii Minouru
Canon Kabushiki Kaisha
Jr. Leon Scott
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