Abstract:
A laser source (10) for emitting an output beam (12) includes a first gain medium (16B) that generates a first beam (16A), a second gain medium (18B) that generates a second beam (18A), a common feedback assembly (28) positioned in the path of the first beam (16A) and the second beam (18), and a control system (32). The common feedback assembly (28) redirects at least a portion of the first beam (16A) back to the first gain medium (16B), and at least a portion of the second beam (18A) back to the second gain medium (18B). The control system (32) selectively and individually directs power to the first gain medium (16B) and the second gain medium (18). Additionally, the common feedback assembly (28) can include a feedback mover (46) that continuously adjusts the angle of incidence of the first beam (16A) and the second beam (18A) on the feedback assembly (28). Moreover, the control system (32) can selectively direct pulses of power to the gain mediums (16B) (18B) based on the position of the feedback assembly (28).
Abstract:
An optical device includes a surface- emitting laser array having a plurality of light- emitting portions; a package member on which the surface-emitting laser array is disposed; and a transparent member retained on the package member and disposed on an optical path of a light beam emitted by the surface-emitting laser array. The transparent member includes an incident plane on which the light beam emitted by the surface-emitting laser array is incident. The incident plane is inclined with respect to an emitting surface of the surface- emitting laser array at a first inclination angle which is smaller than a second inclination angle at which the light emitted by one of the light-emitting portions is incident on another, most-distant one, of the light-emitting portions via reflection by the transparent member.
Abstract:
In a light emitting package (8), at least one light emitting chip (12, 14, 16, 18) is supported by a board (10). A light transmissive encapsulant (30) is disposed over the at least one light emitting chip and over a footprint area (32) of the board. A light transmissive generally conformal shell (40) is disposed over the encapsulant and has an inner surface (44) spaced apart by an air gap (G) from, and generally conformal with, an outer surface (34) of the encapsulant. At least one phosphor (50) is disposed on or embedded in the conformal shell to output converted light responsive to irradiation by the at least one light emitting chip. A thermally conductive filler material disposed in the generally conformal shell (40) is effective to enhance a thermal conductivity of the composite shell material to a value higher than 0.3 W/(m.K).
Abstract:
A transmitter unit is described for an open path gas detector. The unit comprises: an enclosure (14) having a window (16) ; and a coherent radiation transmitter (10) , e.g. a tuneable laser diode transmitter, located within the enclosure and configured to direct a beam of radiation through the window. Th window is slanted with respect to the axis of the beam emitted by the transmitter such that no radiation from the transmitter that is directly incident on the window is reflected by the window directly onto the transmitter. Thereby interference fringes within the emitted radiation are reduced. Alternatively, the window may be replaced by a lens followed by an aperture such that the beam emitted by the transmitter is focused onto the aperture, thereby forming a beam of radiation passing out of the enclosure.
Abstract:
Die Lasereinheit (2) zur Erzeugung von Laserstrahlen mit unterschiedlichen Wellenlängen umfasst eine Spiegeleinheit (80), eine Trägereinheit (30) und ein Ausgangsfenster (50) mit einer Öffnung (60). Dabei weist die Trägereinheit (30) eine Längsachse (40) auf, die im Wesentlichen parallel zu den erzeugten Laserstrahlen verläuft, und die Spiegeleinheit (80) und das Ausgangsfenster (50) sind an gegenüberliegenden Enden des Gehäuseteils (30) und im Wesentlichen quer zur Längsachse (40) angeordnet. Die Trägereinheit (30) umfasst dabei eine Laserdiodeneinheit (34) und ein Druckerzeugungselement (32), mit Hilfe dessen ein Druck auf die Laserdiodeneinheit (34) erzeugbar ist. Vorteilhaft wird damit die Möglichkeit geschaffen, die Wellenlänge über einen grossen Bereich wählen zu können.
Abstract:
An optical semiconductor device comprising an emitted beam branching section (61) which branches an emitted light beam from a laser device (51), a reflected light beam branching section (71) which branches a reflected light beam from an information recording medium (3) into light beams different from each other in focused state, servo signal sensing photodetectors (43, 45) which receive the branched reflected light beam in a defocused state, a first diffraction grating provided in the emitted light beam branching section for diffracting the reflected light beam having passed through the reflected light beam flux branching section, and a signal sensing photodetector (47) which receives the reflected light beam diffracted by the first diffraction grating.