| 摘要 |
A device for harmonizing a laser beam path with an observation path for a target includes a laser that generates a laser beam; a first optical element that directs a first part of the laser beam toward the target along the laser beam path while directing a second part of the laser beam toward a conversion device; and a second optical element that directs a converted beam from the conversion device to a sensor that receives the converted beam and an image from the target. The conversion device includes a photoluminescent material that converts the second part of the laser beam into a converted radiation having a wavelength within a spectral band of the sensor, and an optical assembly that focuses the second part of the laser beam into the photoluminescent material and that collects at least a portion of the converted radiation to form the converted beam. The photoluminescent material can include photoluminescent ions such as erbium ions, or a semiconductor material such as indium arsenide. The photoluminescent material can include two materials, wherein the first material has a photoluminescence lifetime greater than a pulse duration of the pulsed laser beam, and the second material has an emission spectrum of photoluminescence covering at least a portion of a sensitivity spectral band of the sensor. The conversion device can also include a non-linear material that frequency converts the second part of the laser beam into an intermediary radiation having a wavelength shorter than the laser beam, and where the photoluminescent material converts the intermediary radiation into the converted radiation.
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