Design of a high-numerical-aperture digital micromirror device camera with high dynamic range

Area of Science:

• Optical Engineering
• Imaging Systems
• Micro-optics

Background:

• Digital Micromirror Devices (DMDs) are increasingly used in imaging systems.
• Conventional DMD projection lenses have limitations, such as an F/2.45 aperture.
• Achieving high numerical aperture (NA) and high dynamic range simultaneously presents a significant engineering challenge.

Purpose of the Study:

• To develop a high-NA imaging system with enhanced dynamic range using a DMD.
• To overcome the aperture limitations of conventional DMD projection lenses.
• To improve the performance and versatility of DMD-based imaging.

Main Methods:

• Designed a novel objective imaging system incorporating a total internal reflection prism, achieving a working F/# of 1.97.
• Developed an off-axis relay imaging system to correct aberrations in tilt relay imaging.
• Integrated these systems with a DMD chip to create a compact, high-performance camera.

Main Results:

• The new system achieved a working F/# of 1.23, surpassing the conventional F/2.45 limitation.
• Demonstrated a significant increase in dynamic range, 2.41 times greater than conventional systems.
• Field experiments validated the prototype DMD camera's reliability and effectiveness.

Conclusions:

• The developed DMD-based imaging system successfully achieves high NA and high dynamic range.
• The innovative optical design overcomes previous limitations, enabling more robust imaging applications.
• This work presents a reliable and effective solution for advanced imaging needs.