Geodesic device comprising a laser source
AssigneeLeica Geosystems AG
InventorsBernhard Gächter, Bernhard Braunecker
Life of this patent
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Abstract
A laser source is used in a geodesic device to improve the emission of laser light, in which the laser diodes emitting multimodal radiation are influenced by a mode-selective component such that the laser radiation emitted by the laser source has monomodal character. An edge emitter or a vertical semiconductor emitter with an external cavity, is hence used, in which a mode selective component is arranged, for example, a monomode fibre or resonator mirror, which has the effect of a mode-selective resonator construction. Components with negative dispersion can be used for pulse compression to compensate for the greater pulse duration generated by the lengthened cavity.
Claims26
Geodesic device comprising:
- a laser source comprising at least one radiation-producing laser diode, wherein an external cavity having at least one mode-selective component is coordinated with the radiation-producing laser diode, a single-mode characteristic of the emitted laser radiation being produced by the mode-selective component;
- and
- an optical receiver configured to receive radiation reflected from a target for distance measurement to the target, wherein the radiation reflected from the target is produced by the laser source.
Geodesic device, comprising:
- a laser source comprising at least one radiation-producing laser diode, wherein:
- an external cavity having at least one mode-selective component is coordinated with the radiation-producing laser diode, a single-mode characteristic of the emitted laser radiation being produced by the mode-selective component;
- the laser source has at least one further radiation amplifying laser diode;
- and
- wherein the at least one further radiation amplifying laser diode is configured to amplify a radiation input produced by the radiation-producing laser diode.
Geodesic device, comprising:
- a laser source comprising at least one radiation-producing laser diode, wherein an external cavity having at least one mode-selective component is coordinated with the radiation-producing laser diode, a single-mode characteristic of the emitted laser radiation being produced by the mode-selective component, wherein the laser source for emission of laser radiation is formed with a flat emission wavefront.
Geodesic device, comprising:
- a laser source comprising at least one radiation-producing laser diode, wherein an external cavity having at least one mode-selective component is coordinated with the radiation-producing laser diode, a single-mode characteristic of the emitted laser radiation being produced by the mode-selective component, wherein the laser source includes a saturatable absorbing and/or dispersive element that includes a Gires Tournois interferometer, a pair of gratings or a pair of prisms.
Dependencies are inferred from the claim text.