Abstract
With the aim of steering as much incident light power in the +1
diffraction order as possible and suppressing the power in the -1
order, we generated an effective four-level grating by coherently
imaging a 180° binary-phase grating onto a 90° phase
grating. The periods of the gratings were well matched. The
measured overall power fractions in the +1 and -1 orders were 54% and
2%, respectively.
© 2000 Optical Society of America
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