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发帖数: 340 | 1 http://www.edphoton.com/en
Wuxi OptonTech Ltd. specialises in diffractive optical elements (DOEs) and
computer generated holograms (CGHs) for flat-top (also referred to as top-
hat or super-Gaussain) beam shaping and other general beam shaping, beam
splitting, beam homogenizing (diffusing). Examples of general beam shaping
include multi-line patterns, square, view finder, crosshair, grids, rings,
etc. Typical applications of DOEs include phase gratings for optical linear
encoders, DOEs for motion sensing and gesture recognition systems, laser
keyboard. We also provide microlens arrays, Fresnel lenses, DOEs, MEMS, and
other surface-relief microstructures replication services and TIFF/BMP to
GDSII conversion services.
Diffractive beam shapers convert a laser beam with Gaussian intensity
distribution into a beam with an accurate and almost arbitrary intensity
distribution. Particularly, diffractive top-hat beam shaping turns a
Gaussian beam into a uniform super-Gaussian beam. Specific applications
include precise control of treatment depth in laser heat treatment, laser
hardening, cladding; turning a laser beam into a square or hexagon to
increase the fill-factor in laser direct writing; and laser tweezers, etc.
Diffractive beam splitters can be used for simultaneous laser drilling (
perforating) of multi-holes, fiber coupling, etc. Specific applications of
laser drilling include pre-weakening of cartons and metal-foils in packaging
industry, high-speed laser texturing, cigarette filters, etc. We can split
a single beam into up to a million highly uniform beams.
One main advantage of a beam homogenizer is its insensitivity to the
incident beam quality and the change of intensity. Hence it is most suitable
for the less stable lasers, laser with long pulse duration or multi-pulse
laser applications. Due to the lengthy exposure time, the intensity
fluctuation can be averaged to some extent. By rotating the beam homogenizer
, the variation in intensity can be further impressed.
Reconstruction error and speckles are well-known problems associated with
diffractive optics. We use some most advanced approaches to design DOEs and
CGHs which can produce complicated images with virtually zero reconstruction
error. |
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