A light source device connected to an optical fiber and emit light from the optical fiber, the device includes: a plurality of laser light sources to respectively emit light at different wavelengths; a current source to supply a drive current with a superimposed alternating-current component to each laser light source; a light source control section to selectively switch the laser light sources by controlling the current sources; a plurality of optical systems disposed in optical paths of the respective laser light sources to reflect the light from the respective laser light sources to an incident end of the optical fiber and to reflect return light reflected on the incident end to the respective laser light sources; and a return light adjustment section to adjust an amount of the return light to continuously spread a spectrum of the light emitted from the optical fiber.

A dark field digital holographic microscope and associated metrology method is disclosed which is configured to determine a characteristic of interest of a structure. The dark field digital holographic microscope includes an illumination branch for providing illumination radiation to illuminate the structure; a detection arrangement for capturing object radiation resulting from diffraction of the illumination radiation by the structure; and a reference branch for providing reference radiation for interfering with the object radiation to obtain an image of an interference pattern formed by the illumination radiation and reference radiation. The reference branch has an optical element operable to vary a characteristic of the reference radiation so as to reduce and/or minimize variation in a contrast metric of the image within a field of view of the dark field digital holographic microscope at a detector plane.

A device includes a display configured to generate an image light. The device also includes a waveguide optically coupled with the display and configured to guide the image light to an exit pupil of the device. The waveguide includes a grating including a birefringent material, and a birefringence of the grating is configured to increase along a pupil-expanding direction of the device.

A low-cost digital holography microscope (DHM) that is capable of performing inspection at high speed while accurately inspecting an inspection object at high resolution, an inspection method using the DHM, and a method of manufacturing a semiconductor device by using the DHM are provided. The DHM includes: a light source configured to generate and output light; a beam splitter configured to cause the light to be incident on an inspection object and output reflected light from the inspection object; and a detector configured to detect the reflected light, wherein, when the reflected light includes interference light, the detector generates a hologram of the interference light, and wherein no lens is present in a path from the light source to the detector.

An electromagnetic wave phase/amplitude generation device includes a radiation unit configured to radiate electromagnetic waves of a random radiation pattern on a spatial frequency in which a state of the electromagnetic waves to be radiated for each divided region is determined to an imaging object, an imaging unit configured to generate a captured image by imaging scattered electromagnetic waves that are electromagnetic waves generated when the imaging object scatters the electromagnetic waves of the radiation pattern radiated by the radiation unit, and a generation unit configured to generate information indicating at least a phase and amplitude of the electromagnetic waves from the imaging object by performing an arithmetic sparsity constraint operation according to sparsity of the imaging object on the basis of the captured image generated by the imaging unit, information indicating the radiation pattern, and information indicating a signal of the imaging object.

A position tracking system has a laser transmitter, a control tracker and a layout indicator. The laser transmitter has a laser for emitting a laser beam, a controller controlling the laser, and a motor for rotating the emitted laser beam. The control tracker has a housing, at least two photo diodes disposed on the housing, and a laser assembly for generating a beam to be projected unto a surface. The layout indicator has a housing, and at least two photo diodes disposed on the housing. A network server communicates with at least one of the laser transmitter, the control tracker and the layout indicator.

A holographic optical system is provided, including: a light source; a collimator, arranged to receive from the light source and having an output surface configured to provide collimated light, optical properties of the collimator generating aberrations in the collimated light; and an aberration-compensating holographic optical element having a planar diffractive surface arranged to receive collimated light from the output surface, the planar diffractive surface having optical properties such that output light from the planar diffractive surface is compensated for the aberrations generated by the collimator.

An embodiment according to an aspect of the present disclosure provides a device for manufacturing a display lens, a method for manufacturing a display lens using the device, and a head-mounted display device including the display lens manufactured thereby. The device for manufacturing a display lens including a holographic optical element formed by recording a hologram on a photosensitive substrate, in which a substrate is coated with a photosensitive material, through irradiation of laser beams includes: a first laser light incidence unit configured to cause first laser light, converging along an irradiation direction, to be incident on one surface of the photosensitive substrate; and a second laser light incidence unit configured to cause second laser light, diverging at a plurality of points along an irradiation direction, to be incident on the other surface of the photosensitive substrate.

Methods and systems for forming holographic gratings are described herein. The methods and systems may decrease the amount of haze produced during exposure of a holographic recording medium. In some embodiments, the methods and systems include a holographic recording medium; a master hologram containing a grating; and a light source and moveable deflector configured to diffract light through the master hologram into the holographic medium to form a holographic interference pattern. The moveable deflector is configured to move in a direction parallel to the extending direction of the grating. Advantageously, moving the light in this direction allows the holographic interference pattern to remain stationary while there is a spatio-temporal displacement and cancellation of unwanted intensity nonuniformities.

An optical device having suppressed rainbow effect is provided. The optical device includes a light source configured to generate an image light, an optical combiner coupled with the light source and configured to direct the image light to an eye-box of the optical device, and a dimming element disposed at the optical combiner. The optical combiner includes at least one diffractive element. The optical combiner has a first side facing the eye-box and an opposing second side facing a real world, and the dimming element is disposed at the second side of the optical combiner. The dimming element is configured to receive a light from the real world and significantly attenuate an intensity of the light having an incidence angle in a predetermined range.