This application describes examples and implementations of optical devices and techniques based on use of whispering gallery mode (WGM) optical resonators that have nonlinear optical materials in multiple sectors where nonlinear coefficients of two adjacent sectors are oppositely poled.

 
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< Optical system having a transmission optical corrector with a selectively nonuniform passive transmission optical property

< Apparatus and method for use in fulfilling illumination prescription

> Filter for selectively processing optical and other signals

> Lens forchromatic aberration compensation

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