# US 8,542,421 B2 · System, apparatus and method for extracting three-dimensional information of an object from received electromagnetic radiation

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- Number: US 8,542,421 B2
- Document ID: US8542421B2
- Status: Granted
- Kind: B2
- Application number: 12/515,343
- Filed: 2007-11-19
- Published: 2010-06-10
- Granted: 2013-09-24
- Earliest claimed: 2006-11-17
- Assignees: Celloptic, Inc.
- Applicants: Joseph Rosen; Gary Brooker
- Inventors: Joseph Rosen; Gary Brooker
- Web page: https://patentgrep.com/patent/US8542421B2

## CPC

- G03H 1/0841: {Encoding method mapping the synthesized field into a restricted set of values representative of the modulator parameters, e.g. detour phase coding}
- G03B 35/02: by sequential recording
- G03H 1/0402: {Recording geometries or arrangements (G03H1/0443, G03H1/0476, G03H1/16 take precedence)}
- G03H 1/041: {Optical element in the object space affecting the object beam, not otherwise provided for}
- G03H 1/0443: {Digital holography, i.e. recording holograms with digital recording means (holobject computation G03H1/0866)}
- G03H 1/06: using incoherent light
- G03H 1/08: Synthesising holograms, {i.e. holograms synthesized from objects or objects from holograms}(using electric digital computers G06F; G06T)
- H04N 1/00827: {Arrangements for reading an image from an unusual original, e.g. 3-dimensional objects}
- G03H 2001/0224: {Active addressable light modulator, i.e. Spatial Light Modulator [SLM]}
- G03H 2001/0436: {Holographic camera}
- G03H 2001/0452: {arranged to record an image of the object}
- G03H 2001/0458: {Temporal or spatial phase shifting, e.g. parallel phase shifting method}
- G03H 2001/085: {Kinoform, i.e. phase only encoding wherein the computed field is processed into a distribution of phase differences}
- G03H 2223/23: Diffractive element
- G03H 2225/33: Complex modulation
- G03H 2240/13: Amplitude and phase complex modulation
- G03H 2240/21: Optical density variations
- G03H 2240/23: Optical length variations, e.g. bleached silver halide (G03H1/0244 takes precedence)
- G03H 2240/24: Index variations only
- G03H: HOLOGRAPHIC PROCESSES OR APPARATUS (holograms, e.g. point holograms, used as ordinary optical elements G02B5/32; producing stereoscopic or other three-dimensional effects G02B30/00; diffraction-grating systems G02B27/44; systems using moiré fringes G02B27/60; optical logic elements G02F3/00; stereo-photography G03B35/00; photosensitive materials or processes for photographic purposes G03C; {stereo-photographic or similar processes G03C9/00}; apparatus for processing exposed photographic materials G03D; analogue computers performing mathematical operations with the aid of optical elements G06E3/00; authentication by radiation, of concealed information carried by holograms or diffraction gratings G06K19/16; holographic storage G11B7/0065, G11C13/04; {stereoscopic or other three dimensional effects in television systems H04N13/00})
- G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D)
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

An apparatus and method to produce a hologram of an object includes an electromagnetic radiation assembly configured to receive a received electromagnetic radiation, such as light, from the object. The electromagnetic radiation assembly is further configured to diffract the received electromagnetic radiation and transmit a diffracted electromagnetic radiation. An image capture assembly is configured to capture an image of the diffracted electromagnetic radiation and produce the hologram of the object from the captured image.

## Claims

### Claim 1

An apparatus configured to produce a hologram of an object, said apparatus comprising:
an electromagnetic radiation assembly including a diffractive electromagnetic radiation element and configured to receive a received electromagnetic radiation from the object and transmit a transmitted electromagnetic radiation based on the received electromagnetic radiation; and
an image capture assembly configured to capture an image of the transmitted electromagnetic radiation, and produce the hologram of the object from the captured image,
wherein the electromagnetic radiation assembly is configured to control only a phase of the transmitted electromagnetic radiation, and the electromagnetic radiation assembly further comprises
a first electromagnetic radiation assembly configured to receive the received electromagnetic radiation from the object and transmit a first transformed electromagnetic radiation,
the diffractive electromagnetic radiation element is configured to receive the first transformed electromagnetic radiation from the first electromagnetic radiation assembly and transmit a phase-modified electromagnetic radiation that is transformed according to a phase-modifying transmission function that controls only the phase of the phase-modified electromagnetic radiation, and
a second electromagnetic radiation assembly is configured to receive the phase-modified electromagnetic radiation from the diffractive electromagnetic radiation element and transmit as second transformed electromagnetic radiation as the transmitted electromagnetic radiation.

### Claim 2 (depends on 1)

The apparatus of claim 1, wherein the electromagnetic radiation received from the object is a fluorescent light produced by the object.

### Claim 3 (depends on 1)

The apparatus of claim 1, wherein the diffractive electromagnetic radiation element includes a diffractive optical element comprising a spatial light modulator (SLM) having pixels.

### Claim 4 (depends on 3)

The apparatus of claim 3, wherein a first portion of the pixels in the SLM implement a phase function, a second portion of the pixels in the SLM modulate the received electromagnetic radiation with a constant phase, and the pixels are randomly selected to be in one of the first portion or the second portion.