GEODESIC DEVICE COMPRISING A LASER SOURCE

• Main Authors: GAECHTER, BERNHARD, BRAUNECKER, BERNHARD
• Format: Patent
• Language: English; French; German
• Published: 07.06.2006
• Edition: 7
• 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

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.