Adaptive optics with spatio-temporal lock-in detection for temporal focusing microscopy.

Area of Science:

• Biomedical Optics
• Microscopy Techniques
• Adaptive Optics

Background:

• Wavefront distortion in temporal focusing microscopy (TFM) causes spatio-temporal coupling, altering excitation pulse profiles.
• This distortion complicates temporal profile correction, especially in thick samples, limiting imaging depth and clarity.

Purpose of the Study:

• To demonstrate the efficacy of adaptive optics (AO) correction for thick samples in TFM.
• To improve the temporal focusing of excitation pulses within scattering biological tissues.

Main Methods:

• Integration of structured illumination microscopy (SIM) with AO correction in wide-field TFM.
• Utilizing SIM to mitigate pulse duration changes within the signal detection volume.
• Applying AO correction to compensate for optical aberrations in thick specimens.

Main Results:

• Successful AO correction was achieved in a thick sample where conventional AO-TFM failed.
• The combined AO-SIM approach effectively reduced pulse duration distortion.
• Enhanced signal quality and imaging performance in scattering media were observed.

Conclusions:

• AO correction combined with SIM is a viable strategy for overcoming wavefront distortion challenges in thick samples for TFM.
• This technique significantly improves the performance of TFM in scattering biological tissues.
• It opens possibilities for deeper and clearer imaging in complex biological systems.