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Related Experiment Video

Updated: Jul 9, 2026

Multimodal Volumetric Retinal Imaging by Oblique Scanning Laser Ophthalmoscopy (oSLO) and Optical Coherence Tomography (OCT)

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Acousto-optic scanning system with very fast nonlinear scans.

N Friedman, A Kaplan, N Davidson

|December 11, 2007

Summary

A novel acousto-optic scanning system achieves over 100 kHz speeds by using counterpropagating acoustic waves. This breakthrough enables rapid nonlinear and longitudinal focal point scanning, crucial for advanced imaging applications.

Area of Science:

Optics and Photonics
Acousto-Optics
Scanning Systems

Background:

Acousto-optic (AO) devices are widely used for beam steering and modulation.
High-speed scanning is essential for applications like optical coherence tomography and laser processing.
Existing AO scanning systems often face limitations in speed and scan profile control.

Purpose of the Study:

To propose and demonstrate a novel acousto-optic scanning system capable of very high speeds (>100 kHz).
To achieve complete suppression of linear frequency chirp for versatile scanning capabilities.
To enable rapid longitudinal scanning of the focal point by controlling phase shifts.

Main Methods:

Utilizing two counterpropagating acoustic waves with identical frequency modulation.

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Implementing phase control between the modulating signals for longitudinal scanning.

Experimental validation of the proposed acousto-optic scanning system.

Main Results:

Demonstrated scanning speeds exceeding 100 kHz.
Complete suppression of linear frequency chirp was achieved.
Successful implementation of very fast nonlinear and nonconstant linear scans.
Achieved very fast longitudinal scans of the focal point by adjusting phase.

Conclusions:

The proposed acousto-optic scanning system offers unprecedented speed and control.
Suppression of frequency chirp allows for advanced scanning patterns.
The ability for rapid longitudinal scanning opens new possibilities in optical microscopy and manipulation.