Compact module for video-rate image mosaics in two-photon microscopy.

Area of Science:

• Biophysics
• Microscopy
• Neuroscience

Background:

• Multiphoton microscopy is crucial for observing dynamic biological processes, requiring a large field of view and high temporal sampling.
• High numerical aperture objectives are essential for efficient non-linear excitation and fluorescence collection in multiphoton imaging.
• Combining low magnification with high numerical aperture presents a significant challenge in microscope system design.

Purpose of the Study:

• To introduce a novel method for expanding the field of view in multiphoton microscopy.
• To address the design challenges posed by the need for both low magnification and high numerical aperture.
• To enable faster and broader imaging of biological samples.

Main Methods:

• A liquid crystal polarization grating stack was employed to temporally sequence through multiple fields of view.
• The device was implemented as a simple add-on unit for existing multiphoton microscopes.
• The system was demonstrated by imaging neural activity.

Main Results:

• The proposed solution enables panning across the native field of view with minimal latency and no inertial movement.
• The add-on unit increases the total field size by 4x, covering up to 7.6 mm².
• The system successfully demonstrated performance in imaging neural activity.

Conclusions:

• The liquid crystal polarization grating stack offers an effective solution for expanding the field of view in multiphoton microscopy.
• This technology overcomes limitations in current multiphoton imaging systems, facilitating better observation of dynamic biological processes.
• The device provides a practical and scalable method to enhance multiphoton imaging capabilities for neuroscience and other biological applications.