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Generator for parallel collimated beams from fiber coupled laser diodes for laser Doppler measuring devices e.g. laser Doppler anemometers
Generator for parallel collimated beams from fiber coupled laser diodes for laser Doppler measuring devices e.g. laser Doppler anemometers
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机译：激光多普勒测量设备用光纤耦合激光二极管产生平行准直光束的发生器激光多普勒风速计
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摘要
A fiber fixing arrangement (42-43) and a lens array (51-52) are in surface contact with one another in a plane of connection. Apparatus for generating parallel collimating beams from a fiber coupled laser diode which when superimposed in a volume for measurement by means of a transmitting optical device are suitable for illumination of the object in laser Doppler devices. A fiber fixing arrangement (4) and a lens array (5) are in surface contact with one another in a plane of connection (45). The fiber fixing arrangement is a plane parallel plate (42) and has at least two recesses (43) which are positioned in pairs symmetrically with respect to an optical axis predetermined by the transmitting optical device (71) in order to receive the transmitting fibers (31) provided by branching from the laser diode (1). The transmitting fibers are fixed orthogonally and rigidly in the plate in such a way that the end surfaces of the fibers coincide exactly with the plane of connection. The lens array consists of a plane parallel supporting plate (52) with collimating lenses (51) rigidly attached by cementing. The number of collimating lenses and the position thereof corresponds to the number and position of the supplied transmitting fibers in the fiber fixing arrangement. The parameters of the subsequent transmitting optical device and the optical path length through the supporting plate as far as the collimating lens is adapted by adjustment of the thickness of the supporting plate to the aperture of the transmitting fibers and the focal length of the transmitting optical device so that the laser narrowing of the beam (6) focused through the transmitting optical device coincide upon superimposition in the volume for measurement (8). An Independent claim is also given for a method of producing apparatus for generating parallel collimated beams from a fiber coupled laser diode.
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