Abstract:
A system for swept source optical coherence tomography, the system including a light source emitting multiplexed wavelength-swept radiation over a total wavelength range, the light source including N wavelength-swept vertical cavity lasers (VCL) emitting N tunable VCL outputs having N wavelength trajectories, a combiner for combining the N tunable VCL optical outputs into a common optical path to create the multiplexed wavelength-swept radiation, a splitter for splitting the multiplexed wavelength- swept radiation to a sample and a reference path, an optical detector for detecting an interference signal created by an optical interference between a reflection from the sample and light traversing the reference path, and a signal processing system which uses the interference signal to construct an image of the sample, wherein at least one of the N wavelength trajectories differs from another of the N wavelength trajectories with respect to at least one parameter.
Abstract:
A tunable source includes a short-cavity laser optimized for performance and reliability in SSOCT imaging systems, spectroscopic detection systems, and other types of detection and sensing systems. A short cavity laser with a large free spectral range cavity, fast tuning response and single transverse, longitudinal and polarization mode operation is disclosed. Methods for obtaining polarization stable operation of the tunable source are presented.
Abstract:
Semiconductor devices and methods are disclosed in which the amount of p-type material can be minimized, with attendant advantages in electrical, thermal, and optical performance, and in fabrication. A form of the disclosure is directed to a generally planar semiconductor device wherein a layer of p-type semiconductor material (122, 119, 126) is disposed over a layer of n-type semiconductor material (105, 107, 110), and an electric potential is coupled between the p-type layer and the n-type layer, and wherein current in the device that is lateral to the plane of the layers is coupled into the p-type layer. A tunnel junction is adjacent the p-type layer for converting the lateral current into hole current. In an embodiment of this form of the disclosure, the tunnel junction is as an n+/p+ (132, 131) junction oriented with the p+ (131) portion thereof adjacent the p-type layer. The lateral current can be electron current in the n+ layer (132) and/or electron current in a further layer of n-type material disposed over the tunnel junction.
Abstract:
A lens (38, 56, 70, 98, 82) including an oxidized region (16) having at least one oxidized layer (14, 18, 12, 40, 44, 50, 54, 66, 64, 68, 71, 72, 74, 76, 81, 86) which is adjacent to the non-oxidized layer (24, 30, 34, 46, 48, 65, 77) is provided. The lens (38, 56, 70, 98, 82) is used in optical devices such as a light emitting device and a vertical cavity surface emitting laser.
Abstract:
A system for swept source optical coherence tomography, the system including a light source emitting multiplexed wavelength-swept radiation over a total wavelength range, the light source including N wavelength-swept vertical cavity lasers (VCL) emitting N tunable VCL outputs having N wavelength trajectories, a combiner for combining the N tunable VCL optical outputs into a common optical path to create the multiplexed wavelength-swept radiation, a splitter for splitting the multiplexed wavelength- swept radiation to a sample and a reference path, an optical detector for detecting an interference signal created by an optical interference between a reflection from the sample and light traversing the reference path, and a signal processing system which uses the interference signal to construct an image of the sample, wherein at least one of the N wavelength trajectories differs from another of the N wavelength trajectories with respect to at least one parameter.
Abstract:
A high-speed, single-mode, high power, reliable and manufacturable wavelength tunable light source operative to emit wavelength tunable radiation over a wavelength range contained in a wavelength span between about 950nm and about 1150nm, including a vertical cavity laser (VCL), the VCL having a gain region with at least one compressively strained quantum well containing Indium, Gallium, and Arsenic.
Abstract:
A vertical cavity surface emitting laser (VCSEL) having strain or stress elements added for stable polarization control. The elements may disturb the symmetrical stress of the VCSEL structure to induce stable polarization control of its output. Such elements may be attached to the top surface or the sides of the VCSEL, or may be inserted in some of the layers of the VCSEL structure. Some elements may involve the removal of material from the sides of the VCSEL.
Abstract:
A wavelength division multiplexing system based on arrays of wavelength tunable lasers and wavelength tunable resonant photodetectors is disclosed. The system allows self-adjusting of the resonance wavelength of the wavelength tunable photodetectors to the wavelengths of the laser light emitted by the lasers. No precise wavelength stabilization of the lasers is required.
Abstract:
An improved light emitting device (10) comprises: a first conductive layer (16) having a first conductivity type; a light emitting material (20) disposed above the first conductive layer and in electrical communication therewith; a current aperture region (24) comprising at least one layer of oxidizable material, the oxidizable material having a first region (36) which is non-oxidized surrounded by a second region (34) which is oxidized in order to form a current aperture in the oxidizable material, the current aperture region (24) further comprising a third region (36) being non-oxidized and at least adjacent to the second region (34), the current aperture region (24) disposed above the light emitting material and in electrical communication therewith; a second conductive layer (28) having a second conductivity type, the second conductive layer being disposed above the current aperture region (24) and in electrical communication therewith; at least one electrically conductive channel (38, 12) for providing electrical communication to the light emitting material, the channel extending through the third region of the oxidizable material. Additionally, a method for constructing the light emitting device (10) is also provided.