Optical system for digital holography

An optical system (1) comprising at least the following components:

• a first holography arrangement (2) comprising a first diffraction element (3) which is formed by a first prism arrangement (4) having at least a quadrangular base surface, wherein a lateral surface of the first prism arrangement (4) has the following lateral surface regions:
• a) a first entry surface (31) for reference light (100) extending along a first entry plane (310),
• b) a second entry surface (32) for object light (200) extending along a second entry plane (320), wherein the first and second entry surfaces (31, 32) form opposite lateral surface regions of the first prism arrangement (4),
• c) an exit surface (33), which extends along an exit plane (330) and through which diffracted reference light (102) and diffracted object light (201) can exit from the first diffraction element (3),
• d) a prism surface (34) opposite to the exit surface (33), which extends along a prism plane (340),
• e) an optical transmission diffraction grating arrangement (36) arranged in the first diffraction element (3) and extending along a diffraction plane (360) which intersects the first entry plane (310) between the first entry surface (31) and the exit surface (33),
• wherein the transmission diffraction grating arrangement (36) of the first diffraction element (3) comprises at least a first volume phase hologram grating, and in that the first holography arrangement (2) has a first mirror (35) with a first mirror plane (350) on the side of the prism surface (34), wherein the first mirror plane (350) encloses an angle α with the diffraction plane (360) and the prism plane (340) encloses an angle 02 with the diffraction plane (360), wherein at least one of the angles α, w2 is different from 45°, wherein the system further comprises
• a second holography arrangement (2′) having a second diffraction element (3′), which is formed by a second prism arrangement (4′) with at least a quadrangular base surface, wherein the first holography arrangement (2) and the second holography arrangement (2′) are arranged next to one another along an optical axis (OA) of the first diffraction element (3), and a lateral surface of the second prism arrangement (4′) has the following lateral surface regions:
• f) a first entry surface (31′) for reference light (100) extending along a first entry plane (310′),
• g) a entry entrance surface (32′) for object light (200) extending along a second entry plane (320′), wherein the first and second entry surfaces (31′, 32′) form opposite lateral surface regions of the second prism arrangement (4′),
• h) an exit surface (33′), which extends along an exit plane (330′) and through which diffracted reference light (102) and diffracted object light (201) can exit from the second diffraction element (3′),
• i) a prism surface (33′) opposite to the exit surface (33′), which extends along a prism plane (330′),
• j) an optical transmission diffraction grating arrangement (36′) arranged in the second diffraction element (3′) and extending along a diffraction plane (360′) which intersects the first entry plane (310′) between the first entry surface (31′) and the exit surface (33′) of the second diffraction element (3′),
• wherein the transmission diffraction grating arrangement (36′) of the second diffraction element (3′) comprises at least a first volume phase hologram grating, and in that the second holography arrangement (2′) has a second mirror (35′) with a second mirror plane (350′) on the side of the prism plane (340′), wherein the second mirror plane (350′) encloses an angle α′ with the diffraction plane (360′) and the prism plane (340′) encloses an angle w′2 with the diffraction plane (360′), wherein at least one of the angles α′, is different from 45°, wherein the system (1) comprises a first array detector (37), comprising a two-dimensional array of detector elements, wherein the first array detector (37) is configured to detect light exiting from the exit surface (33) of the first diffraction element (3) wherein the first array detector (37) is arranged on the exit surface (33) of the first diffraction element (3).

An optical system (1) comprising at least the following components:

• a first holography arrangement (2) comprising a first diffraction element (3) which is formed by a first prism arrangement (4) having at least a quadrangular base surface, wherein a lateral surface of the first prism arrangement (4) has the following lateral surface regions:
• a) a first entry surface (31) for reference light (100) extending along a first entry plane (310),
• b) a second entry surface (32) for object light (200) extending along a second entry plane (320), wherein the first and second entry surfaces (31, 32) form opposite lateral surface regions of the first prism arrangement (4),
• c) an exit surface (33), which extends along an exit plane (330) and through which diffracted reference light (102) and diffracted object light (201) can exit from the first diffraction element (3),
• d) a prism surface (34) opposite to the exit surface (33), which extends along a prism plane (340),
• e) an optical transmission diffraction grating arrangement (36) arranged in the first diffraction element (3) and extending along a diffraction plane (360) which intersects the first entry plane (310) between the first entry surface (31) and the exit surface (33),
• wherein the transmission diffraction grating arrangement (36) of the first diffraction element (3) comprises at least a first volume phase hologram grating, and in that the first holography arrangement (2) has a first mirror (35) with a first mirror plane (350) on the side of the prism surface (34), wherein the first mirror plane (350) encloses an angle α with the diffraction plane (360) and the prism plane (340) encloses an angle W2 with the diffraction plane (360), wherein at least one of the angles α, w2 is different from 45°, wherein the optical system (1) has an imaging optical unit (12) which is designed to project object light (200) in the form of an intensity pattern onto an object (300) to be detected, wherein the intensity pattern consists of at least one illuminated region or wherein the intensity pattern consists a plurality of disjoint illuminated regions, wherein the system (1) comprises a first array detector (37), comprising a two-dimensional array of detector elements, wherein the first array detector (37) is configured to detect light exiting from the exit surface (33) of the first diffraction element (3) wherein the first array detector (37) is arranged on the exit surface (33) of the first diffraction element (3).