Closed-loop adaptive optics using a spatial light modulator for sensing and compensating of optical aberrations in...

Area of Science:

• Ophthalmic optics
• Adaptive optics
• Optical engineering

Background:

• Spatial light modulators (SLMs) offer multitasking capabilities for aberration sensing and compensation.
• Existing deformable mirrors (DMs) are expensive and typically used only for aberration correction.
• Adaptive optics (AO) systems are crucial for improving image quality in ophthalmic applications.

Purpose of the Study:

• To demonstrate a closed-loop AO system using a single SLM for ophthalmic aberration correction.
• To evaluate the feasibility of using an SLM's multitasking capability in AO systems.
• To achieve diffraction-limited resolution in ophthalmic imaging.

Main Methods:

• A closed-loop AO system was constructed utilizing a single SLM.
• Beam resizing optics were employed to create 137 active subapertures for wavefront sensing.
• Zernike aberrations were introduced and corrected using the SLM, with matched filter and centroiding techniques evaluated.
• The system was tested on an artificial eye and subsequently on three healthy human subjects.

Main Results:

• Diffraction-limited resolution was achieved when correcting Zernike aberrations up to the fourth order.
• Matched filter and intensity-weighted centroiding were identified as effective wavefront sensing techniques.
• Successful closed-loop wavefront correction of aberrations was demonstrated in backscattered light from human eyes.

Conclusions:

• A single SLM can effectively sense and compensate for optical aberrations in ophthalmic applications.
• The developed closed-loop AO system achieves diffraction-limited correction, offering an advantageous alternative to traditional DMs.
• This SLM-based AO system shows significant potential for advancing ophthalmic diagnostics and treatments.