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US 9,853,419 B2Granted
Optical amplifying element, light source device, and image pickup device
AssigneeCanon Kabushiki Kaisha
InventorTakeshi Uchida
Life of this patent
Estimating the term…
Abstract
An optical amplifying element includes: a pair of reflectors that constitutes a cavity; an active layer disposed between the pair of reflectors; and an excitation unit configured to excite the active layer, wherein the active layer excited by the excitation unit amplifies intensity of a laser beam that enters the optical amplifying element when the laser beam reflects back and forth within the cavity, and wherein the pair of reflectors is configured to change a length of the cavity according to a wavelength of the laser beam.
Claims18
A light source device comprising:
- a wavelength tunable laser;
- and
- an optical amplifying element;
- the optical amplifying element comprising:
- a pair of reflectors that constitutes a cavity;
- an active layer disposed between the pair of reflectors;
- and
- an excitation unit configured to excite the active layer, wherein the active layer excited by the excitation unit amplifies the intensity of a laser beam that enters the optical amplifying element, and
- an optical element configured to cause the laser beam emitted from the wavelength tunable laser to enter the optical amplifying element,
- wherein the pair of reflectors is configured to change a length of the cavity according to a wavelength of the laser beam, and
- wherein a light-emitting region of the optical amplifying element is larger than a light-emitting region of the wavelength tunable laser.
8 more elements
An optical amplifying element comprising:
- a pair of reflectors that constitutes a cavity;
- an active layer disposed between the pair of reflectors;
- and
- an excitation unit configured to excite the active layer,
- wherein the active layer excited by the excitation unit amplifies the intensity of a laser beam that enters the optical amplifying element,
- wherein the pair of reflectors is configured to change a length of the cavity according to a wavelength of the laser beam, and
- wherein the pair of reflectors and the active layer are laminated on a substrate in a direction perpendicular to the substrate.
4 more elements
A light source device comprising:
- an optical amplifying element,
- the optical amplifying element comprising:
- a pair of first reflectors that constitutes a first cavity;
- a first active layer disposed between the pair of first reflectors;
- a first current confinement layer that includes a first low resistance region and is disposed between either one of the pair of first reflectors and the first active layer, and
- an excitation unit configured to excite the first active layer,
- wherein the first active layer excited by the excitation unit amplifies the intensity of a laser beam that enters the optical amplifying element,
- wherein the pair of first reflectors is configured to change a length of the first cavity according to a wavelength of the laser beam,
- a wavelength tunable laser,
- the wavelength tunable laser comprising:
- a pair of second reflectors that constitutes a second cavity;
- an second active layer disposed between the pair of second reflectors;
- and
- a second current confinement layer that includes a second low resistance region and is disposed between either one of the pair of second reflectors and the second active layer, and
- an optical element configured to cause the laser beam emitted from the wavelength tunable laser to enter the optical amplifying element,
- wherein the first low resistance region in an in-plane direction perpendicular to a light-emitting direction of the optical amplifying element is larger than the second low resistance region in an in-plane direction perpendicular to a light-emitting direction of the wavelength tunable laser.
13 more elements
Dependencies are inferred from the claim text.