Abstract:
The invention relates to a high-pressure discharge lamp with a discharge vessel having a filling comprising a rare gas, for example argon, mercury, and chlorine, wherein the filling quantities of mercury [Hg] and chlorine [Cl] comply with the following conditions: [Hg].[Cl]>=200 (mumole/cm 3 ) 2 , [Cl] 3 . The condition [Hg].[Cl]>=200 (mumole/cm 3 ) 2 achieves HgCl vapor pressures in the discharge sufficient for generating significant radiation components of the B 2 Sigma + -X 2 Sigma + band system of this molecule. The condition [Cl] 3 serves to limit the chemical aggressiveness of the chlorine filling, in particular to limit the attacks on the wall and electrodes and thus to achieve longer lamp lives. The addition of chlorine-binding metals, in particular of germanium, leads to a further improvement in the radiation and life properties of the lamp.
Abstract:
A low-pressure gas discharge lamp comprising a gas discharge vessel with a gas filling containing an indium compound and a buffer gas, and comprising a phosphor layer containing at least one phosphor emitting in the visible range of the spectrum, and comprising electrodes and means for generating and maintaining a low-pressure gas discharge.
Abstract:
Dispositivo láser de cavidad externa que emite en superficie con conversión de frecuencia intracavidad que comprende: al menos un elemento (1) láser que emite en superficie con múltiples capas, en el que están dispuestas al menos una capa (1a) de ganancia y una capa (1b) reflectante para obtener luz láser a una frecuencia fundamental, medios reflectores, espaciados del elemento (1) láser que emite en superficie para formar una cavidad (12) externa, un dispositivo (3) de conversión de frecuencia, dispuesto en el interior de la cavidad (12) externa para generar luz a una segunda frecuencia, que es diferente de la frecuencia fundamental, y caracterizado por medios de filtro paso banda ópticos sintonizables, dispuestos en el interior de la cavidad (12) externa, y medios detectores, en el que dichos medios de filtro paso banda ópticos pueden sintonizarse a partir de una señal, que se obtiene por los medios detectores.
Abstract:
Low pressure discharge lamp comprises a gas discharge vessel containing a noble gas filling as buffer gas, and electrodes and devices for producing and maintaining a low pressure gas discharge. The lamp further includes at least one zinc halide.
Abstract:
The present invention relates to a method and device for detecting coherent optical radiation. In the proposed method, an emission wavelength (8) of a laser (5) is tuned or set close to a wavelength (9) of the coherent radiation (3) to be detected. The coherent radiation (3) is coupled into the laser cavity and a resulting periodic modulation in output power of the laser emission of the laser are measured or detected. The proposed method and device are only sensitive to coherent radiation in a narrow wavelength range.
Abstract:
A low-pressure gas discharge lamp provided with a gas discharge vessel (1) comprising a gas filling with a discharge-maintaining composition comprising a discharge maintaining compound selected from the group formed by the compounds of aluminum, gallium, indium and thallium, an additive selected from the group of elemental zinc, cadmium and mercury and a buffer gas, which low-pressure gas discharge lamp is further provided with means (2) for generating and maintaining a low - pressure gas discharge.
Abstract:
A surface-emitting extended cavity laser with intracavity frequency conversion is provided with at least one surface-emitting laser element (1) with multiple layers to obtain laser light at a fundamental frequency, reflector means, spaced from the laser element (1) to form an external cavity (12), a frequency conversion device (3), arranged within the external cavity (12) to generate light at a second frequency and tuneable optical band-pass filter means, arranged within the external cavity (12) and detector means, where said optical band-pass filter means are tuneable upon a signal, which is obtained by the detector means to enable a frequency control at the fundamental frequency.
Abstract:
Methods of driving a gas discharge lamp (1). In a first method, a value of voltage (Ul) across the gas discharge lamp (1) is determined, then a correction function (Kd) representing the dependency of light flux on a discharge arc length (d) is applied to calculate a required lamp power value (Pr) for a target light flux value (Ul). Finally, the gas discharge lamp (1) is operated according to the required lamp power value (Pr). In a second method, a value of voltage (Ul) across the gas discharge lamp (1) and a value of pressure (pl) inside the gas discharge lamp (1) are determined, then a correction function (Kp) representing the dependency of light flux on a discharge arc length (d) is applied to calculate a required lamp pressure value (pr) for a target light flux value by using the lamp voltage value (Ul) and the lamp pressure value (pl). Finally, the gas discharge lamp (1) is operated according to the required lamp pressure value (pr). Furthermore, the invention relates to appropriate driving units (4, 58) for driving a gas discharge lamp (1) and to an image rendering system, particulary a projector system, comprising gas discharge lamps (1) and such driving units (4, 58).