Optical imaging and communications
Selected embodiments include an imager providing wide field (WFOV) and foveated images. The imager includes a frontend optic receiving light. Corrective optics reduces distortions, and transmits the light to a splitter. One portion of the light exiting the splitter is focused on a WFOV image detector. A second portion falls on a scanning mirror targeting a selected field position. The light is corrected by an adaptive corrector, which may be configured for field position-dependent correction. The light from the corrector is focused on a foveated image detector. An eye tracker may be employed to select the foveated position corresponding to user gaze direction. Another imager includes a configurable corrector in the imager's optical stop. Free space optical (FSO) communication laser may be combined with a foveated/WFOV imager, with a corrector of the imager correcting the FSO light and a scanning component selecting transmission direction for the FSO light.
1. An imaging system comprising:
a first optical block configured to receive incoming light from a scene in a wide field of view (WFOV) and transmit the incoming light through the first optical block;
a controllable deflecting component configured to receive the incoming light transmitted through the first optical block and redirect at least a portion of the incoming light transmitted through the first optical block in a direction controlled by one or more input signals to the controllable deflecting component;
a dichroic splitter;
an image sensor;
a corrective component placed to receive the incoming light redirected by the controllable deflecting component, the corrective component being configurable to perform wavefront error correction (WFE) on at least some field position of the scene, thereby resulting in corrected incoming light, and send the corrected incoming light towards the dichroic splitter;
wherein the dichroic splitter transmits the corrected incoming light to the image sensor;
a free space optical (FSO) light source operating at a Tx wavelength that is reflected by the dichroic splitter, the FSO light source being configured to emit FSO light toward the dichroic splitter;
wherein:
the dichroic splitter, the corrective component, and the controllable deflecting component are placed so that the FSO light reflected from the dichroic splitter (1) travels to the corrective component, (2) is WFE corrected by the corrective component and reflected by the corrective component toward the controllable deflecting component, and (3) is reflected by the controllable deflecting component towards the first optical block to exit through the first optical block towards the scene in an exit direction, the exit direction being set by the processing system controlling the controllable deflecting component;
in a first mode of operation, the processing system configures the corrective component to perform WFE correction of incoming light for at least one field position and for a first wavelength at which the dichroic splitter is transmissive; and
in a second mode of operation, the processing system configures the corrective component to perform WFE correction of the FSO light corresponding to the Tx wavelength and the field position of the exit direction.
2. An imaging system as in claim 1 , wherein the processing system is further configured to operate the imaging system in a first mode and in the second mode during non-overlapping time periods.
3. An imaging system as in claim 2 , wherein the corrective element comprises a deformable mirror.
4. An imaging system as in claim 2 , wherein the corrective element comprises a folding mirror and a liquid lens.
5. An imaging system as in claim 2 , wherein the corrective element comprises a folding mirror and a spatial light modulator.
6. An imaging system as in claim 2 , wherein the corrected incoming light is transmitted through the dichroic splitter via successive reflections from at least two folding mirror.
7. An imaging system as in claim 2 , wherein the corrected incoming light is transmitted through the dichroic splitter by a folding mirror means for directing light.
8. An imaging system as in claim 2 , wherein the first optical block comprises, a negative lens, a first doublet, and a second doublet.
9. An imaging system as in claim 2 , further comprising a third doublet situated between the corrective element and the dichroic filter so that the corrected incoming light passes through the third doublet.
10. An imaging system as in claim 2 , further comprising a focusing lens situated between the FSO light source and the dichroic splitter so that the FSO light emitted by the FSO light source towards the dichroic splitter passes through the focusing lens.