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:
The invention relates to a laser diode assembly having a semiconductor substrate (2; 101; 201; 301; 72), at least two laser stacks (17, 18; 117, 118, 119; 217, 218; 317, 318; 97, 98, 99) each having one active zone (6, 12; 105, 109, 113; 207, 213; 307, 311; 76, 82, 88) and at least one translucent ohmic contact (9; 107, 111; 204, 210; 304, 309; 79, 85). According to the invention, the laser stacks (17, 18; 117, 118, 119; 217, 218; 317, 318; 97, 98, 99) and the translucent ohmic contact (9; 107, 111; 204, 210; 304, 309; 79, 85) are grown up monolithically on the semiconductor substrate (2; 101; 201; 301; 72). The laser stacks (17, 18; 117, 118, 119; 217, 218; 317, 318; 97, 98, 99) are electrically conductively connected to each other by means of the translucent ohmic contact (9; 107, 111; 204, 210; 304, 309; 79, 85). The laser diodes (26a, 26b, 27a, 27b; 36a, 36b, 37a, 37b; 46a, 46b, 47a, 47b; 66a, 66b, 67a, 67b; 94a, 94b, 95a, 95b, 96a, 96b) formed from the laser stacks (17, 18; 117, 118, 119; 217, 218; 317, 318; 97, 98, 99) have a two-dimensional structure.
Abstract:
A method for producing light emission from a semiconductor device includes the following steps: providing a semiconductor base region disposed between a semiconductor emitter region and a semiconductor collector region that forms a tunnel junction adjacent the base region; providing, in the base region, a region exhibiting quantum size effects; providing an emitter terminal, a base terminal, and a collector terminal respectively coupled with the emitter region, the base region, and the collector region; and applying electrical signals with respect to the emitter terminal, the base terminal and the collector terminal to produce light emission from the base region.
Abstract:
A two terminal semiconductor device for producing light emission in response to electrical signals, includes: a terminal-less semiconductor base region disposed between a semiconductor emitter region and a semiconductor collector region having a tunnel junction adjacent the base region; the base region having a region therein exhibiting quantum size effects; an emitter terminal and a collector terminal respectively coupled with the emitter region and the collector region; whereby application of the electrical signals with respect to the emitter and collector terminals, causes light emission from the base region. Application of the electrical signals is operative to reverse bias the tunnel junction. Holes generated at the tunnel junction recombine in the base region with electrons flowing into the base region, resulting in the light emission. The region exhibiting quantum size effects is operative to aid recombination.
Abstract:
Es wird ein Verfahren zur Herstellung eines strahlungsemittierenden Bauelements (1) angegeben. Eine Abstrahlcharakteristik im Fernfeld wird vorgegeben. Aus der vorgegebenen Abstrahlcharakteristik wird ein Brechungsindexprofil für das strahlungsemittierende Bauelement (1) in einer senkrecht zu einer Hauptabstrahlungsrichtung des Bauelements verlaufenden Richtung ermittelt. Ein Aufbau für das Bauelement wird ermittelt, sodass das Bauelement das zuvor bestimmte Brechungsindexprofil aufweist. Das Bauelement (1) wird gemäß dem zuvor bestimmten Aufbau ausgebildet. Weiterhin wird ein strahlungsemittierendes Bauelement angegeben.
Abstract:
A bipolar quantum cascade (QC) laser includes a p-n junction disposed adjacent to an active/injection region of semiconductor layers. Systems that make use of such QC lasers and methods for manufacturing such QC lasers are also described.
Abstract:
Devices and methods of fabrication of ZnO based single and multi-junction photovoltaic cells are disclosed. ZnO based single and multi-junction photovoltaic cells, and other optoelectronic devices include p-type, n-type, and undoped materials Of Zn x A 1 - x O y B 1-y. wherein the alloy composition A and B, expressed by x and y, respectively, varies between 0 and 1. Alloy element A is selected from related elements including Mg, Be, Ca, Sr, Cd, and In and alloy element B is selected from a related elements including Te and Se. The selection of A, B, x and y, allows tuning of the material's band gap. The band gap of the material may be selected to range between approximately 1.4 eV and approximately 6.0 eV. Zn x A 1-x OyB 1-y based tunnel diodes may be formed and employed in Zn x A 1-x O y B 1-y based multi -junction photovoltaic devices. Zn x A 1-x O y B 1-y based single and multi-junction photovoltaic devices may also include transparent, conductive heterostructures and highly doped contacts to ZnO based substrates.
Abstract translation:公开了基于ZnO的单结和多结光伏电池的制造方法和装置。 基于ZnO的单结和多结光伏电池以及其它光电子器件包括p型,n型和未掺杂的Zn x-x N 1 - 其中由x和y分别表示的合金组合物A和B在0和1之间变化。合金元素A 选自包括Mg,Be,Ca,Sr,Cd和In的相关元素,合金元素B选自包括Te和Se的相关元素。 选择A,B,x和y可以调整材料的带隙。 材料的带隙可以选择在约1.4eV和约6.0eV之间的范围内。 可以形成Zn xS a 1-x O y B 1-y基的隧道二极管,并用于Zn x A 基于1-x O 1的y-1基于多结的光电器件。 基于单结和多结的光电器件也可以是Zn x A 1 x 1-x O 1 B y 1 y y 包括透明的,导电的异质结构和对ZnO基衬底的高度掺杂的接触。
Abstract:
Embodiments of the present invention provide a system for increasing an operational life of a VCSEL. The system can include control circuitry for reducing an amount of bias current at high temperatures and increasing a power of the laser at low temperatures. This control circuitry can further include at least one of a temperature sensor, a Field Programmable Gate Array, a read only memory module, and an electrically erasable programmable read only memory module (EEPROM). In alternate embodiments, the control circuitry can further include a lookup table that sets the bias current depending on a temperature of the laser. The laser can be part of an optoelectronic transceiver module which can include, by way of example and not limitation, SFP, XFP, X2, XAUI, XENPAK, XPAK, GBIC, 8G, 16G, and other optoelectronic modules.