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(Color online) (a) Sketch of 24-phase level spiral phase plate. (b) Microfabricated SPP observed under an optical microscope.
(Color online) Intensity distribution for a range of input bandwidth and source center wavelength at after passing through . Images calculated at .
(Color online) (a) CCD image of the OV beam profile in a femtosecond laser beam from the SPP. Horizontal and vertical cross sections are overlaid on the image. Digitally magnified image after beam propagates (b) and (c) at .
(Color online) Intensity autocorrelation trace of (a) LG femtosecond beam generated by SPP and (b) the unmodulated beam. Note: pulse duration is (assuming a pulse) or (for a Gaussian envelope).
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