Coherent light generators – Particular beam control device – Tuning
Reexamination Certificate
2006-04-18
2009-02-10
Harvey, Minsun (Department: 2828)
Coherent light generators
Particular beam control device
Tuning
C385S011000, C359S483010, C359S490020
Reexamination Certificate
active
07489713
ABSTRACT:
An optical fiber loop has a gain medium having a gain at an oscillation wavelength and optical circulators13and14. Collimate lenses22and24enlarge light bean taken from the optical circulators13and14. A polygon mirror25is provided on the light axis, and is rotated. A diffraction grating27is provided at the receiving position of the light reflected by the polygon mirror25, and is of a Littrow configuration which reflects the light in the same direction as the incident light. A selected wavelength changes according to an incident angle to the diffraction grating27, resulting in increase of selectivity owing to twice incident, thereby permitting to change an oscillation wavelength with narrow band even when changing the selected wavelength by rotating the polygon mirror25at high speed.
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Chong Changho
Morosawa Atsushi
Sakai Tooru
Harvey Minsun
Nguyen Phillip
Santec Corporation
Smith Patent Office
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