Patent application number | Description | Published |
20150049341 | METHOD FOR DRIVING LIGHT SOURCE APPARATUS AND SURFACE EMITTING LASER, AND IMAGE ACQUIRING APPARATUS - A light source apparatus includes a surface emitting laser including a movable mirror, a mirror arranged opposite to the movable mirror, and an active layer arranged between the two mirrors, a mirror driving unit configured to move the movable mirror to a position where laser oscillation is not performed, a laser driving unit configured to inject current into the surface emitting laser, a storage unit configured to store position information of the movable mirror, the position information including a mirror position where laser oscillation is not performed and a mirror position where laser oscillation is performed, and a control unit configured to control the laser driving unit and to determine start timing of the current injection into the surface emitting laser according to the position information output from the storage unit. | 02-19-2015 |
20150085295 | LIGHT EMITTING DEVICE AND OPTICAL COHERENCE TOMOGRAPHY APPARATUS INCLUDING SAME AS LIGHT SOURCE - A light emitting device includes an optical waveguide including an active layer having at least two gain peaks and a pair of clad layers sandwiching the active layer and electrodes disposed in a guided wave direction of the optical waveguide. | 03-26-2015 |
20150138562 | WAVELENGTH-VARIABLE LASER INCLUDING SOA AND OPTICAL COHERENCE TOMOGRAPHY APPARATUS INCLUDING THE LASER - Provided is a wavelength-variable laser including an SOA which controls not a shape of a gain spectrum itself in the SOA but a shape of a gain spectrum obtained in the entire SOA to enable inhibition of output fluctuations. The wavelength-variable laser including an SOA includes: a wavelength selection mechanism for selectively reflecting a wavelength; an SOA for amplifying light, the SOA being configured to reflect light that enters a first end facet by a second end facet opposite to the first facet and to cause light amplified in an active layer to exit from the first facet; and a reflecting member provided outside the SOA, the reflecting member forming a resonator in a pair with the second facet, in which the second facet has a multilayer film to control of a shape of gain spectrum obtained in the entire SOA, the multilayer film having a reflectance depending on wavelength. | 05-21-2015 |
20150146212 | SURFACE EMITTING LASER AND OPTICAL COHERENCE TOMOGRAPHY APPARATUS INCLUDING THE SAME - A surface emitting laser includes a lower reflector, an active layer, a gap portion, an upper reflector, and a driving unit. The lower reflector, the active layer, the gap portion, and the upper reflector are arranged in that order. The surface emitting laser is capable of varying a wavelength of emitted light by changing a distance between the upper and lower reflectors. The driving unit moves one of the upper and lower reflectors in an optical axis direction of the emitted light. At least one of the upper and lower reflectors includes a stacked body in which first layers and second layers are alternately stacked, the second layers having a refractive index lower than a refractive index of the first layers, outermost layers of the stacked body being the first layers, and a third layer provided on at least one end of the stacked body. | 05-28-2015 |
20150146749 | LIGHT-EMITTING ELEMENT ARRAY - A light-emitting element array includes light-emitting elements that emit light in a direction perpendicular to a substrate. Each light-emitting element includes the substrate, a first nitride semiconductor layer on the substrate and having a mesa portion, an active layer made of a nitride semiconductor disposed on the surface of the mesa portion of the first semiconductor layer opposite the substrate, a second nitride semiconductor layer on the active layer, and a heat radiation layer disposed so that the surface formed by projecting the heat radiation layer on a plane perpendicular to the optical axis of the light-emitting element does not overlap with the surface formed by projecting the mesa portion on the same plane when viewed in the optical axis direction. When the light-emitting element is projected on a plane perpendicular to the optical axis, the surface has an area in a specific range. | 05-28-2015 |
20150198431 | SURFACE EMITTING LASER AND OPTICAL COHERENCE TOMOGRAPHY APPARATUS INCLUDING THE SAME - A surface emitting laser includes a lower reflector, an active layer, a gap portion, and an upper reflector, which are arranged in that order, and a driving unit. The surface emitting laser is capable of varying a wavelength of emitted light by changing a distance between the upper and lower reflectors. The driving unit moves one of the upper and lower reflectors in an optical axis direction of the emitted light. When λ | 07-16-2015 |
20150263219 | LIGHT SOURCE AND OPTICAL COHERENCE TOMOGRAPHY APPARATUS INCLUDING THE LIGHT SOURCE - A light source includes an upper electrode layer, a lower electrode layer, and an active layer interposed therebetween. At least one of the upper and lower electrode layers is divided into a plurality of electrodes separated from each other in an in-plane direction of the active layer. The separated electrodes independently inject current into a plurality of different regions in the active layer. The light source emits light by injecting current from the upper and lower electrode layers into the active layer, guide the light in the in-plane direction, and output the light. The plurality of different regions in the active layer include a first region not including a light exit end and a second region including the light exit end, and the second region is configured to emit light of at least first-order level. The active layer has an asymmetric multiple quantum well structure. | 09-17-2015 |
20150282274 | LIGHT SOURCE SYSTEM AND OPTICAL COHERENCE TOMOGRAPHY APPARATUS USING THE LIGHT SOURCE SYSTEM - A light source system includes a laminate having a lower electrode layer, an active layer and an upper electrode layer in this order, a light-emitting element including at least one of the upper electrode layer and the lower electrode layer divided into a plurality of electrodes and configured to emit light by injecting a current into the active layer via the upper electrode layer and the lower electrode layer, and a control unit configured to control a current injecting amount to the upper electrode layer and the lower electrode layer. The control unit controls a half-value width of the emission spectrum of the light-emitting element by varying a difference between an injection current density to a first electrode and an injection current density to a second electrode among the plurality of electrodes. | 10-01-2015 |