Image Upconversion from the Visible to the UV Domain: Application to Dynamic UV Microstereolithography

Area of Science:

• Optics and Photonics
• Materials Science
• Additive Manufacturing

Background:

• Microstereolithography typically uses direct UV light projection.
• Optical frequency upconversion allows visible light to be converted to higher energy UV light.
• Quadratic nonlinear optical materials are key for frequency conversion processes.

Purpose of the Study:

• To introduce a new application of optical frequency upconversion for dynamic UV microstereolithography.
• To demonstrate the feasibility of using upconverted visible images for UV polymerization.
• To explore the potential of nonlinear optical materials in advanced additive manufacturing.

Main Methods:

• A 150 x 150 pixel visible image was generated using a liquid-crystal display.
• The visible image was optically upconverted to UV light using a lithium triborate crystal.
• The generated UV image was employed to polymerize a commercial stereolithography resin.

Main Results:

• Successful polymerization of a stereolithographic resin was achieved using the upconverted UV image.
• The upconversion process demonstrated the capability to generate dynamic UV patterns.
• The study validates the use of nonlinear optical materials for image-based UV curing.

Conclusions:

• Optical frequency upconversion offers a novel pathway for dynamic UV microstereolithography.
• This method enables the use of visible light sources for UV-based additive manufacturing.
• The integration of nonlinear optics with microfabrication opens new possibilities in 3D printing and material processing.