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

Area of Science:

• Optics and Photonics
• Microscopy Technology
• Wavefront Engineering

Background:

• Acousto-optic deflectors (AODs) enable optical wavefront manipulation for applications like 3D microscopy.
• Previous wavefront shaping with AODs was limited by pulsed illumination, restricting acquisition rates.
• Non-linear acoustic drive frequencies offer potential for dynamic wavefront control.

Purpose of the Study:

• To demonstrate dynamic wavefront shaping using acousto-optic lenses (AOLs) with non-linear drive frequencies.
• To achieve high-speed continuous axial scanning and aberration correction.
• To model and analyze aberration correction capabilities of multi-AOD AOLs.

Main Methods:

• Utilized a pair of AODs with counter-propagating acoustic waves to form a cylindrical acousto-optic lens (AOL).
• Applied non-linear drive frequencies for dynamic wavefront shaping.
• Developed a theoretical model for aberration correction in multi-AOD AOL systems.

Main Results:

• Demonstrated high-speed continuous axial line scanning.
• Achieved the first experimental AOL-based correction of cylindrical lens aberration at 30 kHz (1/35th wave accuracy at 800 nm).
• Modeled partial/full spherical aberration correction using four/six AOD AOLs.

Conclusions:

• Dynamic wavefront shaping with AOLs overcomes previous acquisition rate limitations.
• AOLs offer a viable solution for high-speed optical wavefront control and aberration correction.
• The developed model provides a pathway for designing advanced AOL systems for aberration correction.