Power-effective scanning with AODs for 3D optogenetic applications.

Area of Science:

• Neuroscience
• Optical Microscopy
• Optogenetics

Background:

• Two-photon (2P) excitation microscopy is crucial for deep brain imaging and targeted stimulation in neuroscience.
• Current 2P optogenetic stimulation methods, especially in 3D, are limited by slow and inefficient scanning systems.
• Acousto-optic deflectors (AODs) offer faster scanning but suffer efficiency drops in large volumes.

Purpose of the Study:

• To develop and validate a novel AOD-based scanning scheme for enhanced 2P 3D optogenetic stimulation.
• To improve power delivery and efficiency across different illumination planes in 3D scanning.
• To enable more effective interrogation of large neuronal networks using 3D optogenetics.

Main Methods:

• Implementation of a new AOD-based scheme for 2P 3D scanning.
• Application of the method for photostimulating optogenetic actuators in zebrafish larvae.
• Evaluation of neuronal activity responses and activation probabilities.

Main Results:

• The novel AOD scheme demonstrated improved power delivery between illumination planes.
• Photostimulation in zebrafish larvae resulted in increased neuronal activity responses.
• Uniform activation probabilities were observed across neuronal clusters within the 3D volume.

Conclusions:

• The developed AOD driving scheme significantly enhances 2P 3D optogenetic stimulation efficiency.
• This method allows for more effective and uniform activation of neuronal clusters in large-scale networks.
• The approach opens new possibilities for AOD applications in advanced neuroscience research and 3D interrogation.