Abstract: A diffractive optical element including a diffraction layer including a plurality of optical axes along an in-plane direction, wherein the diffraction layer includes an anisotropic material that satisfies one of Relationship Equations 1A to 3A ?n1(450 nm)<?n1(550 nm)??n1(650 nm)??Relationship Equation 1A ?n1(450 nm)??n1(550 nm)<?n1(650 nm)??Relationship Equation 2A ?n1(450 nm)=?n1(550 nm)=?n1(650 nm)??Relationship Equation 3A wherein, in Relationship Equations 1A to 3A, ?n1 (450 nm) is a birefringence of the anisotropic material at a wavelength of 450 nanometers, ?n1 (550 nm) is a birefringence of the anisotropic material at a wavelength of 550 nanometers, and ?n1 (650 nm) is a birefringence of the anisotropic material at a wavelength of 650 nanometers.

Abstract: A diffractive optical element including a diffraction layer including a plurality of optical axes along an in-plane direction, wherein the diffraction layer includes an anisotropic material that satisfies one of Relationship Equations 1A to 3A ?n1(450 nm)<?n1(550 nm)??n1(650 nm)??Relationship Equation 1A ?n1(450 nm)??n1(550 nm)<?n1(650 nm)??Relationship Equation 2A ?n1(450 nm)=?n1(550 nm)=?n1(650 nm)??Relationship Equation 3A wherein, in Relationship Equations 1A to 3A, ?n1 (450 nm) is a birefringence of the anisotropic material at a wavelength of 450 nanometers, ?n1 (550 nm) is a birefringence of the anisotropic material at a wavelength of 550 nanometers, and ?n1 (650 nm) is a birefringence of the anisotropic material at a wavelength of 650 nanometers.

Abstract: An optical head for a hologram optical apparatus and a method of operating the same are provided. The optical head for the hologram optical apparatus includes a reference light unit for guiding reference light, a signal light unit for guiding signal light, and a light source unit for providing 1 the reference light and the signal light to the reference light unit and the signal light unit, wherein the reference light unit and the signal light unit are stacked. The signal light unit includes: a plurality of optical waveguides stacked sequentially; composite hologram optical elements and lighting hologram optical elements disposed on the plurality of optical waveguides; an optical modulator for modulating light output from the plurality of the optical waveguides; and a lens for condensing light output from the optical modulator onto a recording layer.

Abstract: Provided is a holographic recording method in which an interference fringe between a reference beam and a signal beam, modulated according to information regarding a plurality of hologram pixels, is recorded on a holographic recording medium, the holographic recording method including multiplexing-recording the interference fringe of the plurality of hologram pixels such that at least a part of the interference fringe recorded of neighboring hologram pixels of the plurality of hologram pixels is overlapped.

Abstract: An integrated hologram optical device, a method of manufacturing the same, and an integrated hologram recording apparatus are provided. The integrated hologram optical device includes a two-dimensional (2D) array of a plurality of hogels. A holographic element is configured to be recorded such that a combination of the plurality of hogels is configured to adjust at least one of an angle and a focal length of a signal beam.

Abstract: Provided are a complex spatial light modulator and a three-dimensional (3D) image display including the same. The complex spatial light modulator includes a spatial light modulator configured to modulate a phase of a light beam, a prism array disposed after the spatial light modulator and including an array of prism portions each having a first prism surface and a second prism surface, and a diffractive device configured to diffract a light beam that has passed through the prism array. Accordingly, both the phase and amplitude of the light beam may be modulated.

Abstract: Disclosed is an autocorrelator for generating an autocorrelation signal for an ultrashort pulse to measure the ultrashort pulse. The autocorrelator comprises: a light source unit for generating an optical pulse; a double wedge interferometer in which a first wedge and a second wedge serving as a wedge-shaped optical medium are arranged such that facing surfaces of the first and second wedges are parallel to each other, so as to separate the optical pulse provided by the light source unit to generate two optical pulses; a harmonic light medium for receiving the generated two optical pulses to generate second harmonic light; and a measurement unit for detecting the second harmonic light to generate an autocorrelation signal. Thus, the time width of an ultrashort pulse can be measured by an interferometer using only two wedge-shaped optical components.

Abstract: Provided are a complex spatial light modulator and a three-dimensional (3D) image display including the same. The complex spatial light modulator includes a spatial light modulator configured to modulate a phase of a light beam, a prism array disposed after the spatial light modulator and including an array of prism portions each having a first prism surface and a second prism surface, and a diffractive device configured to diffract a light beam that has passed through the prism array. Accordingly, both the phase and amplitude of the light beam may be modulated.

Abstract: Disclosed is an autocorrelator for generating an autocorrelation signal for an ultrashort pulse to measure the ultrashort pulse. The autocorrelator comprises: a light source unit for generating an optical pulse; a double wedge interferometer in which a first wedge and a second wedge serving as a wedge-shaped optical medium are arranged such that facing surfaces of the first and second wedges are parallel to each other, so as to separate the optical pulse provided by the light source unit to generate two optical pulses; a harmonic light medium for receiving the generated two optical pulses to generate second harmonic light; and a measurement unit for detecting the second harmonic light to generate an autocorrelation signal. Thus, the time width of an ultrashort pulse can be measured by an interferometer using only two wedge-shaped optical components.

Abstract: Provided is a holographic recording method in which an interference fringe between a reference beam and a signal beam, modulated according to information regarding a plurality of hologram pixels, is recorded on a holographic recording medium, the holographic recording method including multiplexing-recording the interference fringe of the plurality of hologram pixels such that at least a part of the interference fringe recorded of neighboring hologram pixels of the plurality of hologram pixels is overlapped.

Abstract: An integrated hologram optical device, a method of manufacturing the same, and an integrated hologram recording apparatus are provided. The integrated hologram optical device includes a two-dimensional (2D) array of a plurality of hogels. A holographic element is configured to be recorded such that a combination of the plurality of hogels is configured to adjust at least one of an angle and a focal length of a signal beam.

Abstract: An optical head for a hologram optical apparatus and a method of operating the same are provided. The optical head for the hologram optical apparatus includes a reference light unit for guiding reference light, a signal light unit for guiding signal light, and a light source unit for providing 1 the reference light and the signal light to the reference light unit and the signal light unit, wherein the reference light unit and the signal light unit are stacked. The signal light unit includes: a plurality of optical waveguides stacked sequentially; composite hologram optical elements and lighting hologram optical elements disposed on the plurality of optical waveguides; an optical modulator for modulating light output from the plurality of the optical waveguides; and a lens for condensing light output from the optical modulator onto a recording layer.