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US 2004/0105482 A1Published application
Semiconductor laser apparatus, semiconductor laser control method, and image displaying apparatus
AssigneeKabushiki Kaisha Toshiba
InventorsTooru Sugiyama, Masaki Tsuchida, Nobuaki Kaji, Kiyoyuki Kawai
Life of this patent
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Abstract
Rays of light emitted from the semiconductor laser are converted into parallel rays of light by cylindrical lenses. Then, the light passed through the cylindrical lenses is caused to enter an optical fiber changed continuously from a specific position in the middle toward an incidence end part in such a manner that the core shape at the incidence end part becomes elliptic, with the cross-sectional area remaining unchanged.
Claims13
A laser apparatus comprising:
- a laser unit configured to emit laser light;
- an optical member configured to convert the laser light emitted from said laser unit into parallel light rays;
- and
- an optical fiber having a core with a predetermined cross-sectional shape, and being provided with a fiber end portion, said fiber end portion having an exterior side configured to receive the light rays from said optical member, and having an interior side being continued to the core of said optical fiber,
- the interior side of said fiber end portion being configured to have a given shape with a first area,
- the exterior side of said fiber end portion being configured to have substantially an elliptical shape with a second area of which amount is substantially equal to an amount of the first area of said interior side, and
- the given shape at the interior side of said fiber end portion changing continuously to the elliptical shape at the exterior side of said fiber end portion.
4 more elements
A method of handling laser light comprising
- converting laser light, emitted from a semiconductor laser device, into parallel light rays;
- and
- inputting the converted parallel light rays into an incidence end face of an optical fiber wherein
- said optical fiber includes an end portion having the incidence end face, and
- the incidence end face is obtained by changing a cross-section of the end portion into a substantially elliptical shape while keeping an area of the cross-section to be constant.
2 more elements
An image display apparatus for use with a screen comprising:
- (a) a laser apparatus including
- a laser unit configured to emit laser light, and
- a first optical fiber having a core with a predetermined cross-sectional shape, and being provided with an incidence end face for receiving the laser light wherein the incidence end face is obtained by changing a cross-section of the first optical fiber into a substantially elliptical shape while keeping an area of the cross-section to be constant;
- (b) a second optical fiber configured to excite the laser light passing through said first optical fiber;
- (c) a modulator configured to spatially modulate the laser light excited by said second optical fiber;
- and
- (d) an optical projection unit configured to receive the laser light being spatially-modulated by said modulator and to output the received spatially-modulated laser light toward the screen.
4 more elements
Dependencies are inferred from the claim text.