Siemens Aktiengesellschaft

Jds Uniphase Corporation

Osram Gmbh

Infineon Technologies Ag

Osram Opto Semiconductor Gmbh

Osram Opto Semi-conductors Gmbh Co. Ohg

Bruno Acklin

Martin Rudolf Behringer

Stefan Groetsch

Meinrad Schienle

Johann Luft

Markus Wicke

Werner Späth

Karl-Heinz Schlereth

Gustav Mueller

Martin H Muendel

Stefan Grötsch

Steven Sanders

Bernard G Fidric

Marten Swart

Axel Schubert

Werner Spaeth

Josef Dirmeyer

Gerhard Kuhn

Victor Rossin

Lothar Stoll

Karl Joachim Ebeling

Shaoping Lu

Ulrich Wolff

Christian Hanke

Helmut Rost

Martin Honsberg

Zeljko Spika

Gustav Muller

Stefan Gr&ouml;tsch

Jan Bellermann

Jörg Heerlein

Lutz Korte

Harald Boettner

Matthias Heinbach

The invention relates to a conventional broad-area laser having a single-mode output through the phenomenon of multimode interference (MMI) in step-index waveguides. Another aspect of the present invention relates to a very robust multi-mode compound cavity laser design that is fully defined by the geometry and the refractive index profile of the MMI region, which is quite insensitive to slight macro-scale refractive index variations due to manufacturing variation or temperature. As the self-imaging position shifts linearly in the refractive index, the confocal beam parameter can be made relatively long.

Single spatial mode output multi-mode interference laser diode with external cavity

A laser device having a semiconductor body (), which has a plurality of active layers () arranged vertically one above the other and serving for generating laser radiation. The active layers are subdivided in the transverse direction into a plurality of emission zones () and are electrically connected in series in the vertical direction. The semiconductor body () is formed in monolithic integrated fashion, and a cooling element () is provided on which the semiconductor body () is arranged.

Laser device having a plurality of emission zones

A light-emitting power semiconductor device is placed on a metillic substrate structure with the formation of a good heat-transfer contact, in which a plastic protective body surrounds the power semiconductor device, leaving exposed a light exit region in the nature of a cap.

Array with light-emitting power semiconductor component and corresponding production method

A semiconductor laser has a semiconductor body with first and second main areas, preferably each provided with a contact area, and also first and second mirror areas. An active layer and a current-carrying layer are formed between the main areas. The current-carrying layer has at least one strip-type resistance region, which runs transversely with respect to the resonator axis and whose sheet resistivity is increased at least in partial regions compared with the regions of the current-carrying layer that adjoin the resistance region.

Semiconductor laser with lateral current conduction and method for fabricating the semiconductor laser

A Lyot depolarizer for depolarizing a laser with multiple longitudinal modes comprises two segments of PM fiber optimized for length as a function of the longitudinal mode spacing of the laser source, and not as taught in the prior art as a function of the laser coherence length. The present invention has found secondary coherence peaks in the coherence function of a multiple longitudinal mode source, which can significantly worsen the DoP if the PM fiber lengths are significantly extended beyond optimum, contrary to the teaching in the prior art. The present invention makes use of the periodic structure of the source spectrum by converting half the longitudinal modes to an orthogonal polarization state. As a result a significantly shorter fiber depolarizer is needed than for a single longitudinal mode source. Greater temperature stability is achieved by properly adjusting the lengths of both segments of PM fiber.

Fiber depolarizer for fabry-perot laser diodes

A method for producing semiconductor laser components in which, a number of chip mounting areas are formed on a cooling element having an electrically insulating carrier that is in the form of a plate. A number of semiconductor laser chips are then fit to the cooling element, with one semiconductor laser chip being arranged on each chip mounting area. Finally, the cooling element, with the semiconductor bodies fit on it, is subdivided into a number of semiconductor laser components.

Method for producing semiconductor laser components

Method for fabricating a thermoelectric converter having a plurality of series-connected thermoelement cells, which are connected in series with one another by means of a plurality of first electrical conductor tracks ( ) and each of which has a first body ( ) made of thermoelectric material of a first conduction type and a second body ( ) made of thermoelectric material of a second conduction type. The thermoelement cells are fabricated by means of method steps appertaining to semiconductor technology.

Process for producing a thermoelectric converter

Illumination unit for an apparatus, particularly for the implementation of diaphanoscopic examinations at a human, animal or botanical examination subject, has a monolithic semiconductor laser diode bar with driveable laser diodes that emit radiation as well as at least one optical arrangement for collimating and/or focusing the emitted laser radiation. The laser diode bar and the optical arrangement are mounted at a common carrier, and the laser diode bar is connected to pin-like terminal elements at the carrier for diode drive, that are in turn connected or connectable to terminals provided at a carrier plate accepting the carrier. A radiation-transparent covering that encapsulates the carrier.

Encapsulated illumination unit

A configuration for triggering a restraining device has firing elements that are optically fired by an associated triggering device. In addition, an optical check signal can be transmitted to the firing element by the triggering device. An evaluation circuit evaluates light signals that have been transmitted to the triggering device. As a function of an evaluated, received light signal, a disable signal, by which emission of a firing signal is prevented, is generated by the evaluation circuit.

Configuration for triggering a restraining device in a motor vehicle

A laser component with a laser array and an optical device for shaping the laser beams emitted by the laser array. The optical device comprises a deflection mirror element following the laser array in the beam direction that simultaneously deflects the individual laser beams of the emitted laser array beam from the radiation direction with respectively the same rotational sense parallel to the common plane and perpendicular thereto. The deflection mirror element is composed of a step-shaped light waveguide stack.

Laser component with a laser array and method for manufacturing the component

An arrangement is composed of at least two waveguides, which are coaxially optically coupled to one another integrated on the surface of the substrate with different degrees of wave guidance. The axis of the more weakly-guiding waveguide is straight and the axis of the more strongly-guiding waveguide comprises a curved section.

Arrangement of two integrated optical waveguides on the surface of a

Coupling arrangement for optically coupling together an OEIC module and

An integrated optical arrangement operated as a switch composed of at least three ridge waveguides on a substrate, the third ridge waveguide is utilized for an infeed of an optical waveguide proceeding between two parallel ridge waveguides forming the first and second waveguides having either a contacted pn-junction or a contacted pin-junction. As a result of asymmetrical switching of the junctions, the optical wave is coupled over into one or the other of the first and second waveguides. The advantage over traditional directional coupler switch structures are complete symmetry of the two switch conditions, 'digital switching behavior', enhanced separation of the output waveguide, low switching losses and greater manufacturing tolerances, reduced polarization sensitivity and increased optical bandwidth.

Integrated optical arrangement of ridge waveguides on a substrate

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Mountain View, CA, United States of America

Bruno Acklin