Beam Shaper

Diffractive Optical Element (DOE)

Pattern GeneratorDiffraction efficiency:   

Approximately 70% @ 633 nm

Edge sharpness:   

Function of aperture and input beam.

Speckle size

Shape convolved with input beam.

Divergence tolerance:   

<0,1 degrees

 

Uniformity:   

100% modulation, producing a speckle-like pattern of uniform intensity.

Auxiliary optics:

At focal point of lens, the pattern looks best (convolve with Airy pattern).

Input beam:    

Small input yields large speckle, 1 mm diameter beam. Large beam looks best at the focal point of a lens (airy pattern looks better than guassian when convolved with diffuser function). Need multiple unit cells across the beam. Lower number of unit cells makes beam lumpier.

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LD Collimators & Diffractive Optics

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