An infrared image is captured while an infrared reference wavefront and an infrared imaging signal are incident on an image pixel array. A frequency domain infrared image is generated by performing a transform operation on the infrared image. A filtered frequency domain infrared image is generated by applying a mask to the frequency domain infrared image to isolate a frequency representing the interference between the infrared reference beam and the incoming infrared image signal. Intensity data is generated from the filtered frequency domain infrared image. The intensity data is incorporated as a voxel value in a composite image.

The present disclosure discloses a hologram recording device and a hologram recording method. The hologram recording device comprises an object imaging unit comprising a cavity for accommodating an object whose interior wall is a reflective surface, and a light modulating unit configured to produce incident light and reference light interfering with the incident light and to direct the incident light to the object imaging unit. The cavity is provided with an imaging aperture for imaging of the object and at least one light incidence aperture for allowing the incident light to enter the cavity and irradiate on the object, such that an image of the object is formed at a location corresponding to the imaging aperture outside the cavity, and image light produced upon the imaging of the object interferes with the reference light at the location for recording of an image surface hologram.

The present invention can realize both a transmission type and a reflection type, and provides a holographic microscope which can exceed the resolution of the conventional optical microscope, a hologram data acquisition method for a high-resolution image, and a high-resolution hologram image reconstruction method. In-line spherical wave reference light (L) is recorded in a hologram (I.sub.LR) using spherical wave reference light (R), and an object light (O.sup.j) and an illumination light (Q.sup.j) are recorded in a hologram (I.sup.j.sub.OQR) using a spherical wave reference light (R) by illuminating the object with an illumination light (Q.sup.j, j=1, . . . , N) which is changed its incident direction. From those holograms, a hologram (J.sup.j.sub.OQL), from which the component of the reference light (R) is removed, is generated, and from the hologram, a light wave (h.sup.j) is generated. A light wave (c.sup.j) of the illumination light (Q.sup.j) is separated from the light wave (h.sup.j), and using its phase component (.sup.j=c.sup.j/|c.sup.j|), a phase adjustment reconstruction light wave is derived and added up as (H.sub.P=h.sup.j/.sup.j), and an object image (S.sub.P=|H.sub.P|.sup.2) is reconstructed.

A laser beam (L50) is reflected by a light beam scanning device (60) and irradiated onto a hologram recording medium (45). On the hologram recording medium (45), an image (35) of a linear scatter body is recorded as a hologram by using reference light that converges on a scanning origin (B). The light beam scanning device (60) bends the laser beam (L50) at the scanning origin (B) and irradiates the laser beam onto the hologram recording medium (45). At this time, by changing a bending mode of the laser beam with time, an irradiation position of the bent laser beam (L60) on the hologram recording medium (45) is changed with time. Diffracted light (L45) from the hologram recording medium (45) produces a reproduction image (35) of the linear scatter body on a light receiving surface (R) of the stage 210. When an object is placed on the light receiving surface (R), a line pattern is projected by hologram reproduction light, so that the projected image is captured and a three-dimensional shape of the object is measured.

An apparatus for capturing a Fourier hologram splits a coherent light source into an object beam and a reference beam, sets a distance of a virtual focal plane of a subject, generates spherical wave field data propagated from a point source of the virtual focal plane to a central coordinate plane of a spatial light modulator, generates a spherical wave field on a space from the spherical wave field data and the reference beam by the spatial light modulator, synthesizes an object wave field generated by reflecting the object beam by the subject and the spherical wave field with each other so that an interference pattern is formed on the image sensor face, captures the interference pattern formed on the image sensor face, and then performs Fourier transformation to calculate an object wave field formed on the focal plane of the subject.

A laser beam (L50) is reflected by a light beam scanning device (60) and irradiated onto a hologram recording medium (45). On the hologram recording medium (45), an image (35) of a linear scatter body is recorded as a hologram by using reference light that converges on a scanning origin (B). The light beam scanning device (60) bends the laser beam (L50) at the scanning origin (B) and irradiates the laser beam onto the hologram recording medium (45). At this time, by changing a bending mode of the laser beam with time, an irradiation position of the bent laser beam (L60) on the hologram recording medium (45) is changed with time. Diffracted light (L45) from the hologram recording medium (45) produces a reproduction image (35) of the linear scatter body on a light receiving surface (R) of the stage 210. When an object is placed on the light receiving surface (R), a line pattern is projected by hologram reproduction light, so that the projected image is captured and a three-dimensional shape of the object is measured.

An optical information recording/reproducing apparatus and method thereof which compensate for the effect of mechanical instability on holographic data storage. A time dependent deviation profile of an optical beam during recording is determined. The time dependent deviation profile is related to a phase profile to be applied to a reference beam during recording or reproduction of a hologram, and the related phase profile is applied to the reference beam during recording or reproduction of the hologram.

A method and system for use in reconstruction and retrieval of phase information associated with a two-dimensional diffractive response are presented. The method comprising: providing (75) input data indicative of one or more diffractive patterns corresponding to diffractive responses from one or more objects (50). Dividing (130) said input data into a plurality of one-dimensional slices and determining (140) one-dimensional phase data for at least some of said one-dimensional slices. Tailoring (150) the reconstructed phase data of said one-dimensional slices to form a two-dimensional phase solution. The two-dimensional phase solution is defined by phase shifts of said reconstructed one-dimensional phase data of said one-dimensional slices. The two-dimensional phase solution thus enables obtaining two-dimensional reconstructed phase data suitable for reconstruction of image data (250).

An optical information recording/reproducing apparatus and method thereof which compensate for the effect of mechanical instability on holographic data storage. A time dependent deviation profile of an optical beam during recording is determined. The time dependent deviation profile is related to a phase profile to be applied to a reference beam during recording or reproduction of a hologram, and the related phase profile is applied to the reference beam during recording or reproduction of the hologram.

The image observation apparatus introduces an object light, which is at least part of an object illumination light emitted from a light source and projected onto an object and which is reflected by the object, through a first optical waveguide to an image sensor, introduces a reference light, which is emitted from the light source and passes through an optical path different from that of the object light, to the image sensor, and records an interference fringe through the image sensor as a hologram. The apparatus forms the recorded hologram on a spatial light modulator and illuminate the modulator with a hologram illumination light corresponding to the reference light to generate a reconstruction light, and causes the reconstruction light entering a second optical waveguide optically equivalent to the first optical waveguide and exiting from the second optical waveguide to form an object reconstructed image.