GEODESIC DEVICE COMPRISING A LASER SOURCE

Geodetic unit (1), especially a total station or distance meter, has a laser light source with at least a radiation producing laser diode (2b). The latter has an external cavity with at least a mono-selective component (2d) for selection of a single mode characteristic or monochromatic laser radiati...

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Bibliographic Details
Main Authors GAECHTER, BERNHARD, BRAUNECKER, BERNHARD
Format Patent
LanguageEnglish
French
German
Published 07.06.2006
Edition7
Subjects
ANALOGOUS ARRANGEMENTS USING OTHER WAVES
BASIC ELECTRIC ELEMENTS
DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES
DEVICES USING STIMULATED EMISSION
ELECTRICITY
GYROSCOPIC INSTRUMENTS
LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES
MEASURING
MEASURING DISTANCES, LEVELS OR BEARINGS
NAVIGATION
PHOTOGRAMMETRY OR VIDEOGRAMMETRY
PHYSICS
RADIO DIRECTION-FINDING
RADIO NAVIGATION
SURVEYING
TESTING
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Summary:Geodetic unit (1), especially a total station or distance meter, has a laser light source with at least a radiation producing laser diode (2b). The latter has an external cavity with at least a mono-selective component (2d) for selection of a single mode characteristic or monochromatic laser radiation. The selective component can be a linear emitter or a vertical semiconductor emitter driven by an external cavity in which there is a mono-selective component, e.g. a monomode fiber or resonating mirror that results in a mono-selective resonance effect. To compensate the longer pulse duration caused by the elongated cavity, components with negative dispersion can be used for pulse compression.
Bibliography:Application Number: EP20040765370