Dynamic holography focused depth printing device
A printing device ( 106 ) includes a laser source and a LCOS-SLM (Liquid Crystal on Silicon Spatial Light Modulator). The printing device generates a laser control signal and a LCOS-SLM control signal. The laser source ( 110 ) generates a plurality of incident laser beams based on the laser control signal. The LCOS-SLM ( 112 ) receives the plurality of incident laser beams, modulates the plurality of incident laser beams based on the LCOS-SLM control signal to generate a plurality of holographic wavefronts ( 214,216 ) from the modulated plurality of incident laser beams. Each holographic wavefront forms at least one corresponding focal point. The printing device cures a surface layer or sub-surface layer ( 406 ) of a target material ( 206 ) at interference points of focal points of the plurality of holographic wavefronts. The cured surface layer of the target material forms a three-dimensional printed content.
1. A method for forming a body of cured target material corresponding to a three-dimensional object, the method comprising:
providing a spatial light modulator displaying a hologram that is a holographic domain representation corresponding to the three-dimensional object;
illuminating a spatial light modulator with laser light;
modulating, with the spatial light modulator, the laser light to generate spatially-modulated light;
performing a holographic transform on the spatially-modulated light to form a holographic reconstruction of the hologram as one or more light field regions in a target material, the one or more light field regions corresponding to a body of the three-dimensional object; and
curing a portion of the target material at the one or more light field regions to form the body of cured target material corresponding to the three-dimensional object,
wherein the holographic transformation is performed by one or more lenses, wherein the one or more lenses includes a software lens displayed on the spatial light modulator together with the hologram.
2. The method of claim 1 , further comprising:
identifying a plurality of predefined spatial locations corresponding to the three-dimensional object in the target material;
generating a LCOS-SLM control signal and a laser control signal to adjust a position of the one or more light field regions in the target material to correspond with the plurality of predefined spatial locations.
3. The method of claim 2 , wherein the LCOS-SLM control signal is provided in real time by calculation of a hologram based on image data based on the three-dimensional object, the LCOS-SLM control signal causing the LCOS-SLM to display the hologram.
4. The method of claim 1 , wherein the laser light is collimated.
5. The method of claim 1 , wherein the modulation of the laser light includes a phase modulation of the laser light.
6. The method of claim 1 , wherein the modulation of the laser light is a phase-only modulation of the laser light.
7. The method of claim 1 , wherein the one or more lenses includes a physical lens.
8. The method of claim 1 , wherein the one or more lenses includes both a physical lens and a software lens displayed on the spatial light modulator together with the hologram.
9. The method of claim 1 , wherein the hologram is formed as a frequency-domain representation corresponding to the three-dimensional object, and the holographic transform is a frequency-space transform.
10. The method of claim 1 , wherein the hologram is formed as a Fourier-domain representation corresponding to the three-dimensional object, and the frequency-space transform is a Fourier transform.
11. The method of claim 1 , wherein the spatial light modulator is a liquid-crystal-on-silicon spatial light modulator.
12. The method of claim 1 , wherein the spatial light modulator is a reflective spatial light modulator.
13. The method of claim 1 , wherein a plurality of light field regions are formed at different depths within the target material.
14. The method of claim 1 , wherein the curing is performed by local heating of the target material.
15. A system for forming a body of cured target material corresponding to a three-dimensional object, the system comprising:
a laser source configured to generate laser light;
a spatial light modulator configured to receive and modulate the collimated laser light to provide spatially-modulated light; and
a hardware processor comprising a dynamic holography printing application configured to cause the spatial light modulator to display a hologram that is a holographic representation corresponding to the three-dimensional object;
wherein
a) the system further comprises one or more physical lenses and/or
b) the dynamic holography printing application is configured to cause the spatial light modulator to display a software lens together with the hologram,
the one or more physical lenses and/or the software lens being configured to perform a holographic transform on the spatially-modulated light to form a holographic reconstruction of the hologram as one or more light field regions; and
wherein the system further comprises the curable target material disposed at a position where it can be cured by the one or more light field regions.
16. The system of claim 15 , wherein the spatial light modulator is a liquid-crystal-on-silicon spatial light modulator.
17. The system of claim 15 , wherein the spatial light modulator is a reflective spatial light modulator.
18. The system of claim 15 , wherein the spatial light modulator is a phase-only spatial light modulator.
19. The system of claim 15 , wherein the system includes the one or more physical lenses.
20. The system of claim 15 , wherein the dynamic holography printing application is configured to cause the spatial light modulator to display the software lens together with the hologram.
21. The system of claim 15 , wherein the curable material is a heat-curable material.