Abstract
Vortex and axicon phase masks are introduced to the pupil plane of an imaging system, altering both the point spread function and optical transfer function for monochromatic and broadband coherent and incoherent light. Each phase mask results in the reduction of the maximum irradiance of a localized coherent laser source, while simultaneously allowing for the recovery of the incoherent background scene. We describe the optical system, image processing, and resulting recovered images obtained through this wavefront encoding approach for laser suppression.
Highlights
Wavefront coding is the process of introducing a phase mask in the pupil plane of an optical system and recovering an image through digital processing
We investigate the use of higher-order vortex and axicon phase masks in the pupil plane of the imaging system to redistribute the coherent laser light away from a tight focal spot, thereby reducing the irradiance on individual pixels while allowing for the recovery of the background image
The unique attributes of the vortex and axicon pupil plane phase masks for both the coherent and incoherent imaging conditions make both phase patterns good candidates for wavefront coding in our specification application, which we explore through a computational experiment
Summary
Wavefront coding is the process of introducing a phase mask in the pupil plane of an optical system and recovering an image through digital processing. Such optical systems are designed by jointly considering the optical system and the image processing for a specific function or application. In a traditional imaging system, a distant laser source will be focused onto the focal plane of the optical system. We investigate the use of higher-order vortex and axicon phase masks in the pupil plane of the imaging system to redistribute the coherent laser light away from a tight focal spot, thereby reducing the irradiance on individual pixels while allowing for the recovery of the background image.
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