Aberration free synthetic aperture second harmonic generation holography

Area of Science:

• Optics and Photonics
• Biomedical Imaging
• Microscopy

Background:

• Second Harmonic Generation (SHG) microscopy is a powerful label-free imaging technique.
• Traditional SHG microscopy methods suffer from limited spatial resolution and phase information loss.
• Illumination aberrations in SHG microscopy are challenging to correct.

Purpose of the Study:

• To introduce and demonstrate a novel Second Harmonic Generation holographic synthetic aperture imaging technique.
• To overcome the limitations of conventional scanning SHG microscopy by incorporating phase information.
• To achieve diffraction-limited SHG imaging with enhanced spatial resolution and aberration correction.

Main Methods:

• Acquisition of a series of holograms using plane wave illumination at varying incident angles.
• Implementation of a computational algorithm for estimating and correcting pupil phase aberrations in both input and output optics.
• Application of synthetic aperture principles to increase the spatial frequency support of the imaging system.

Main Results:

• Demonstration of SHG holographic synthetic aperture imaging in both forward (transmission) and backward (epi) configurations.
• Successful estimation and correction of phase aberrations, leading to improved image quality.
• Achieved diffraction-limited resolution by combining the spatial frequency support of illumination and detection optics.

Conclusions:

• The proposed SHG holographic synthetic aperture imaging method significantly enhances spatial resolution and corrects aberrations.
• The developed phase correction algorithm is computationally efficient and robust, applicable to various imaging data.
• This technique offers a pathway to advanced, high-resolution label-free imaging using SHG microscopy.