Acousto-optic wavefront sensing and reconstruction

Principles of Wavefront Sensing and Reconstruction

A variety of approaches to wavefront sensing and reconstruction are surveyed as they are used in adaptive optics and related applications. These include the Gerchberg-Saxton algorithm; shearing interferometry; and Shack-Hartmann, curvature, and pyramid wavefront sensing. Emphasis is placed on the relevant optics and mathematics, which are developed in some detail for Shack-Hartmann and curvatur...

Acousto - Optic Isolator ( Aoi )

Dynamic wavefront shaping with an acousto-optic lens for laser scanning microscopy.

Acousto-optic deflectors (AODs) arranged in series and driven with linearly chirped frequencies can rapidly focus and tilt optical wavefronts, enabling high-speed 3D random access microscopy. Non-linearly chirped acoustic drive frequencies can also be used to shape the optical wavefront allowing a range of higher-order aberrations to be generated. However, to date, wavefront shaping with AODs h...

Spatial sensitivity of acousto-optic and optical near-infrared spectroscopy sensing measurements.

Near-infrared spectroscopy (NIRS) is a popular sensing technique to measure tissue oxygenation noninvasively. However, the region of interest (ROI) is often beneath a superficial layer, which affects its accuracy. By applying focused ultrasound in the ROI, acousto-optic (AO) techniques can potentially minimize the effect of physiological changes in the superficial layer. Using absorption pertur...

Fast Acousto-optic Tissue Sensing with Tandem Nanosecond Pulses Experiments and Theory

Acousto-optics (AO) is an emerging hybrid technique for measuring optical contrast in turbid media with the use of coherent light and ultrasound (US). The turbid object of interest is illuminated with a coherent light source and as a consequence a speckle pattern is formed. With the use of US a small volume of interest is selected, which is commonly referred to as the ‘tagging’ volume. This vol...