Sensitivity of synthetic aperture laser optical feedback imaging

Area of Science:

• Optics and Imaging Technologies
• Biomedical Engineering
• Laser Physics

Background:

• Laser optical feedback imaging (LOFI) is a sensitive technique for various applications.
• Conventional direct imaging in LOFI uses optical focalization.
• Limitations exist in resolution and working distance for direct imaging methods.

Purpose of the Study:

• To compare the sensitivity and performance of two LOFI configurations: direct imaging and synthetic aperture (SA) imaging.
• To evaluate the trade-offs between resolution, working distance, and photometric balance for each configuration.
• To highlight the advantages of SA-based LOFI for 3D information acquisition.

Main Methods:

• Implementation and comparison of a direct imaging LOFI system.
• Development and testing of a synthetic aperture (SA) laser-based LOFI system utilizing numerical focalization.
• Quantitative and qualitative analysis of imaging performance, including resolution, working distance, and photometric balance.

Main Results:

• The SA configuration achieves good resolution at a high working distance.
• SA imagery exhibits a worse photometric balance compared to conventional direct imaging.
• The inherent sensitivity of LOFI partially compensates for the SA's photometric drawback.
• SA-based LOFI demonstrates the capability to acquire 3D information within a single x-y scan.

Conclusions:

• SA-based LOFI offers a promising alternative to direct imaging, particularly for applications requiring high resolution and extended working distances.
• The trade-off in photometric balance is a key consideration for SA-LOFI, but its sensitivity and 3D imaging potential are significant benefits.
• SA-LOFI expands the utility of laser optical feedback imaging by enabling advanced imaging capabilities.