摘要:
It is an object of the invention to provide a simple setup of a waveguide laser which allows to control the emission of specific laser wavelengths in a laser material having laser transitions of similar wavelengths. For this purpose a core (4) forming a gain medium is provided with a cladding (6) which introduces losses to an undesired laser transition but is transparent to the light of a desired laser transition. A second cladding (8) is provided for guiding the laser radiation. Pr: ZBLAN with a Tb: doped cladding may be used. Instead of the absorbing cladding (6) a photonic crystal (20) may be used. The laser is end-pumped by a laser diode (14).
摘要:
A method 200 of manufacturing a (part of) color ring is provided. The color ring converts a color of light emitted by a light emitter into at least one other color. The method (200) comprising the steps of: i) pressing (102) a first ring body of a first granulated precursor comprising a first luminescent material for converting the color of the light of the light emitter into a first one of the at least one other color, and ii) sintering (104) the first ring body for obtaining a first ceramic ring. The color ring comprises at least a segment of the first ceramic ring. Further, the method may comprises the steps of: iii) pressing (208) a second ring body of a second granulated precursor, wherein the first luminescent material is absent, iv) sintering (210) the second ring body for obtaining a second ceramic ring, v) segmenting (206) the first ceramic rings in at least two parts and segmenting (212) the second ceramic ring in at least two parts, and vi) forming (214) at least a part of the color ring by coupling a part of the first ceramic ring and a part of the second ceramic ring.
摘要:
The invention describes a method of driving a gas-discharge lamp (1), wherein the lamp (1) is driven at any one time using one of a number of driving schemes and wherein the operating voltage of the lamp (1) is monitored to obtain a number of operation data values (D) during operation of the lamp (1), a target voltage (VT) is determined on the basis of at least one of the number of operation data values (D), and a driving scheme switch-over occurs according to a relationship between the target voltage (VT) and the operating voltage of the lamp (1). The invention further describes a driving unit (10) for driving a gas-discharge lamp (1) comprising a voltage monitoring unit (12) for monitoring the operating voltage of the lamp (1) to obtain a number of operation data values during operation of the lamp (1); a target voltage determination unit (13) for determining a target voltage (VT) on the basis of at least one of the number of operation data values, and a driving scheme switching unit (14) for switching from a first driving scheme to a second driving scheme according to a relationship between the target voltage (VT) and the operating voltage of the lamp (1).
摘要:
A method 200 of manufacturing a (part of) color ring is provided. The color ring converts a color of light emitted by a light emitter into at least one other color. The method (200) comprising the steps of: i) pressing (102) a first ring body of a first granulated precursor comprising a first luminescent material for converting the color of the light of the light emitter into a first one of the at least one other color, and ii) sintering (104) the first ring body for obtaining a first ceramic ring. The color ring comprises at least a segment of the first ceramic ring. Further, the method may comprises the steps of: iii) pressing (208) a second ring body of a second granulated precursor, wherein the first luminescent material is absent, iv) sintering (210) the second ring body for obtaining a second ceramic ring, v) segmenting (206) the first ceramic rings in at least two parts and segmenting (212) the second ceramic ring in at least two parts, and vi) forming (214) at least a part of the color ring by coupling a part of the first ceramic ring and a part of the second ceramic ring.
摘要:
The invention relates to a lighting apparatus for generating light. A primary light generator generates primary light (6), which is converted by a light converting material (8) into secondary light (3), wherein the primary light is directed to a primary surface (9) of the light converting material. An enclosure (10) comprising a transparent cover (7) hermetically encloses the light converting material, wherein the transparent cover is transparent to the primary light and located on the primary surface of the light converting material. The enclosure increases the photostability of the light converting material. This allows increasing the intensity of the primary light by, for example, increasing the power of the primary light and, thus,of the secondary light, and/or by focusing the primary light onto a smaller area on the primary surface, thereby allowing decreasing the optical Étendue of the secondary light, without damaging the light converting material.
摘要:
In this method an arc-length control value, indicating the current length of a discharge arc of the gas-discharge lamp (1), is monitored and the lamp (1) is driven in a first operation mode (OMP) with a first current wave-shape when the arc-length control value indicates that the arc-length is higher than a switching threshold, which first current wave-shape is selected to result in a tip (31) growing on an electrode (30) of the lamp (1), and the lamp (1) is driven in a second operation mode (OMn) with a second current wave-shape when the arc-length control value indicates that the arc-length is lower than a switching threshold, which second current wave-shape is selected such that the tip (31) on the electrode (30) is at least partly melted back. In this method an operating frequency of the lamp is switched from a first frequency value (fi) to a second frequency value (f2), which second frequency • (f 2) value is higher than the first frequency value (fi)′, if a first time criterion pertaining to a duration of driving of the lamp (1) in the second operation mode (OMn) is fulfilled and the operating frequency is switched from the second frequency value (f2) to the first frequency value (fi), if a second time criterion pertaining to a duration of driving of the lamp (1) in the first operation mode (OMP) is fulfilled.
摘要:
The invention relates to the dielectric composition on the basis of barium titanate (BaTiO3) that is present with Ba(Zn1/3Nb2/3)O3 in a perovslite structure, which dielectric composition exhibits an average grain size d50 in the range of 0.2 μm to 0.5 μm and a crystallite size d10 below 0.3 μm.
摘要翻译:本发明涉及基于存在于Ba(Zn 1/3 N 2 Nb 3/3)的钛酸钡(BaTiO 3 3)的电介质组合物, 这种电介质组合物在0.2μm至0.5μm的范围内表现出平均晶粒尺寸d 50,微晶尺寸d 10 SUB>0.3μm以下。
摘要:
The invention relates to the dielectric composition on the basis of barium titanate (BaTiO3) that is present with Ba(Zn1/3Nb2/3)O3 in a perovslite structure, which dielectric composition exhibits an average grain size d50 in the range of 0.2 μm to 0.5 μm and a crystallite size d10 below 0.3 μm.
摘要翻译:本发明涉及基于存在于Ba(Zn 1/3 N 2 Nb 3/3)的钛酸钡(BaTiO 3 3)的电介质组合物, 这种电介质组合物在0.2μm至0.5μm的范围内表现出平均晶粒尺寸d 50,微晶尺寸d 10 SUB>0.3μm以下。
摘要:
The invention describes a tunable filter arrangement with a plurality of resonators which are coupled to one another and of which there is at least one which comprises a piezoelectric component made of a ferroelectric material and to which a DC voltage source is connected. The application of a DC voltage to the resonator renders it possible to change its electrical properties and thus the overall filter characteristic. Furthermore, a transmitter, a receiver device, and a mobile telephone device with such a filter arrangement are disclosed, aswell as a tunable bulk acoustic wave resonator.