An imaging system includes an infrared illuminator, an ultrasonic emitter, a reference wavefront generator, and an image pixel array. The infrared illuminator emits a general illumination emission into a three-dimensional diffuse medium, where a portion of the general illumination emission encounters a voxel within the diffuse medium. The ultrasonic emitter focuses an ultrasonic signal to the voxel to wavelength-shift the portion of the general illumination emission to generate a shifted infrared imaging signal. The reference wavefront generator generates an infrared reference wavefront having a same wavelength as the shifted infrared imaging signal. The image pixel array captures an infrared image of an interference between the shifted infrared imaging signal and the infrared reference wavefront.

An image pixel array captures and infrared image of an interference between an imaging signal and a reference wavefront. A display pixel array generates an infrared holographic imaging signal and the image pixel array receives the infrared imaging signal through the display pixel array.

An infrared imaging signal is generated to illuminate tissue. An infrared image of an exit signal of the infrared imaging signal is captured. The infrared imaging signal is within a frequency band.

There is provided a lighting system for a vehicle. The lighting system comprises a holographic projector and a light distribution system. The holographic projector comprises a hologram engine and a spatial light modulator. The hologram engine is arranged to output holograms. The spatial light modulator is arranged to display each hologram and spatially-modulate light in accordance with each hologram. The spatially-modulated light forms a holographic reconstruction, corresponding to each hologram, on a replay plane. The light distribution system comprises a plurality of optical fibres. Each optical fibre comprises an input optically-coupled to respective sub-area of the replay plane and an output optically coupled with an illumination sub-system of the vehicle.

An additive manufacturing device may include a material supply, a robot, and a printing head coupled to a distal end of the robot and configured to receive printing material from the material supply. The additive manufacturing device may have an IR holographic device configured to generate a targeting hologram, an IR sensor, and a controller coupled to the robot, the printing head, the IR holographic device, and the IR sensor. The controller may be configured to cause the printing head to dispense the printing material to form an object based upon the targeting hologram.

An infrared imaging signal is generated. An image of an exit signal of the infrared imaging signal is captured. The infrared imaging signal is within a frequency band.

An imaging device includes an image pixel array and a display pixel array. The image pixel array is configured to capture an infrared image of an interference between an infrared imaging signal and an infrared reference wavefront. The display pixel array is configured to generate an infrared holographic imaging signal according to a holographic pattern driven onto the display pixels. The holographic pattern is derived from the infrared image captured by the image pixel array.

An infrared image is captured by an image sensor and a frequency domain infrared image is generated by performing a Fourier transform operation on the infrared image. A filtered frequency domain infrared image is generated by applying a mask to the frequency domain infrared image. A spatial domain infrared image is generated by performing an inverse Fourier transform on the filtered frequency domain infrared image. Phase data is extracted from the spatial domain infrared image and a holographic pattern generated from the phase data is driven onto a display.

Systems, devices, and methods for holographic optical elements are described. A holographic optical element includes a first layer of holographic material and a second layer of holographic material. The first layer of holographic material includes a first hologram responsive to light in a first waveband and a second hologram responsive to light in a second waveband. The second layer of holographic material includes a third hologram responsive to light in a third waveband and may include a fourth hologram responsive to light in a fourth waveband. The first, second, third, and fourth wavebands are distinct and may comprise light of red, blue, green, and infrared wavelengths, respectively. Distribution of the three or four holograms on two layers of holographic material allows each hologram to have an index modulation of greater than 0.016, a diffraction efficiency of greater than 15%, and an angular bandwidth of greater than 12.

A system for making a holographic medium for use in generating light patterns for eye tracking includes a light source configured to provide light and a beam splitter configured to separate the light into a first portion of the light and a second portion of the light that is spatially separated from the first portion of the light. The system also includes a first set of optical elements configured to transmit the first portion of the light for providing a first wide-field beam onto an optically recordable medium and one or more diffractive optical elements configured to receive the second portion of the light and project a plurality of separate light patterns onto the optically recordable medium for forming the holographic medium.