Fluorescent wavefront shaping using incoherent iterative phase conjugation

Phase conjugation involving incoherent counterpropagating beams in photorefractive media.

We propose and analyze a new type of phase conjugation between counterpropagating beams in photorefractive materials based on diffraction from transmission gratings only. This effect does not require temporal coherence between the counterpropagating beams and may occur spontaneously, with no external seeding, even with wide (frequency) band light sources.

Wavefront reconstruction using iterative Fourier transforms.

Hybrid phase retrieval using moment-based wavefront sensing and Gerchberg-Saxton iterative transform method

The iterative phase retrieval method has the intrinsic weakness in computational speed. However, its ability to capture fine spatial phase structure is clearly the benefit much needed in characterizing image quality of an instrument in an end-to-end fashion. The empirical wisdom of any iterative process is that the convergence becomes a lot faster when the initial guess is close to the phase so...

Ultrasonically encoded light as feedback to iterative wavefront shaping for focusing into random media

Microgenetic optimization algorithm for optimal wavefront shaping.

One of the main limitations of utilizing optimal wavefront shaping in imaging and authentication applications is the slow speed of the optimization algorithms currently being used. To address this problem we develop a microgenetic optimization algorithm (μGA) for optimal wavefront shaping. We test the abilities of the μGA and make comparisons to previous algorithms (iterative and simple-genetic...