Study on four-step computer-generated hologram with same diffraction efficiency of the zeroth and first order

Abstract

Downloaded From: http://opticalengineering.spiedigitallibrary.org/ on 05/16/2015 Terms of Use: http://spiedl.org/terms Optical Engineering 50(8), 085801 (August 2011)Study on four-step computer-generated hologram with same diffraction efficiency of the zeroth and first order Abstract. A type of computer-generated hologram (CGH) with 4-step microstructure is designed based on diffraction theory. Results show that this CGH has almost the same diffraction efficiency at zeroth diffractive order and positive first diffractive order, which are 38.51% and 38.04%, respectively, and the intensity of these two beams is 76.55% of incident beam. This type of 4-step CGH can be used in an off-axis convex aspherical mirror interferometric system with double CGHs, while the signal-to-noise ratio (SNR) of the interferogram is high enough. C 2011 Society of Photo-Optical Instrumentation Engineers (SPIE).

Generalized diffractive optical elements with asymmetric harmonic response and phase control

“…For example, Davis et al used gratings where the diffraction was divided mainly between the zeroth and first-orders to impose amplitude information onto phase-only structures [21]. This 0th-1st grating duplicator was also studied in [22] with a four-step computer-generated hologram, with an overall efficiency η 0.766. Efficiencies of 100% were obtained when reproducing this duplicator, but using waveplate gratings where polarization-control adds an additional degree of freedom [23].…”