Patent ID: 11953764
Assignee: OPTICA AMUKA (A.A.) LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 24:
25. Optical apparatus, comprising:
a transparent envelope;
an electro-optical layer, contained within the envelope and having an effective local index of refraction at any given location that is determined by a voltage waveform applied across the electro-optical layer at the location, having an available dynamic phase modulation range determined by a thickness and a range of effective local index of refraction of the electro-optical layer;
an array of excitation electrodes disposed over a surface of the transparent envelope; and
control circuitry, which is configured to apply voltage waveforms to the excitation electrodes so as to generate across at least a part of the active area of the electro-optical layer a phase modulation profile comprising spatially alternating peaks and troughs separated by phase transitions chosen so as to emulate a Fresnel lens, while applying a phase modulation over at least 90% of the part of the active area emulating the Fresnel lens that is less than 70% of the available dynamic phase modulation range of the electro-optical layer.