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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-Gaussian) 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

Illustration of the use of diffractive optical element

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.

DOEs can convert a Gaussian beam to a beam with almost any intensity distribution

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