A new device, consisting of two phase gratings oriented with a small angle between their grating grooves, acts as a variable-profile diffraction grating that produces variations in the diffraction orders as the illumination region is moved across the device. Combinations of phase gratings that optimize the effect and act as passive light modulators are given. An experiment that demonstrates the principle is described.
© 1998 Optical Society ofAmerica
(050.1950) Diffraction and gratings : Diffraction gratings
(050.1970) Diffraction and gratings : Diffractive optics
(060.4080) Fiber optics and optical communications : Modulation
(060.5060) Fiber optics and optical communications : Phase modulation
(230.1360) Optical devices : Beam splitters
Donald C. O’Shea and Willie S. Rockward, "Light modulation from crossed phase gratings," Opt. Lett. 23, 491-493 (1998)