Patent ID: 11892802
Assignee: NATIONAL CENTRAL UNIVERSITY
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A lensless holographic imaging system having a holographic optical element, comprising:
a partially coherent light source for outputting a light beam;
a light modulator which is a rotatable mirror for receiving the light beam and modulating the light beam into a plurality of reading lights and each one having a specific wavefront;
a multiplexed holographic optical element irradiated with each one of the reading lights such that a portion of the each one of reading lights undergoes diffraction in the multiplexed holographic optical element and exits the multiplexed holographic optical element as a system reference light while another portion of the each one of reading lights exits the multiplexed holographic optical element through a first surface thereof as an object-irradiating light, the object-irradiating light being projected to and reflected by an inspection plane of an object under inspection to form an object-diffracted light, the object-diffracted light entering the multiplexed holographic optical element through the first surface thereof, passing through the multiplexed holographic optical element, and exiting the multiplexed holographic optical element through a second surface thereof; and
an image capture device located at the second surface and configured to read interference signals generated by interference between the object-diffracted light and the beam of system reference light corresponding to each one of the reading lights;
wherein the multiplexed holographic optical elements are set through a recording process irradiated with at least one recording light and at least one of the plurality of reading lights such that the multiplexed holographic optical elements record a plurality of interference patterns.