Projects (TBD)

We develop a novel additive manufacturing technology using a femtosecond pulsed laser that offers micro-scale printing and high beam intensity with no heat-affected zones.

One of our primary interests is simultaneous production and inspection. For example, we utilize manufacturing lasers to generate ultrasound (laser ultrasonics) for inline monitoring during processes.

• Park, S. H. et al., "Mechanical properties estimation of additively manufactured metal components using femtosecond laser ultrasonics and laser polishing" International Journal of Machine Tools and Manufacture, 166, 103745, 2021.

Laser ultrasonic is a noncontact, nondestructive testing technology that uses a laser to generate and measure ultrasound. 

The ultrafast laser can generate and measure the ultrasound up to THz frequencies, allowing for nano-scale nondestructive testing in semiconductor industries

• Yi, K., Park, S. H., et al., "Femtosecond laser ultrasonic inspection of a moving object and its application to estimation of silicon wafer coating thickness" Optics and Lasers in Engineering, 148, 106778, 2022

Tungsten, one of the refractory metals, is a typical "hard to print" metal. We develop high-quality tungsten alloys using additive manufacturing with their material processing methods. (images from Lew lab at Stanford)

• Park, S. H. et al., "In-situ alloying of tantalum-tungsten alloys using laser powder bed fusion additive manufacturing" In preparation, 2024

Machine/Deep learning is likely the most recent invention that makes the impossible possible. We develop novel machine/deep learning specifically tailed for nondestructive testing datasets.

• Park, S. H. et al., "Three-Dimensional Stress-Strain Curve Estimation and Visualization Using Ultrasound and The Ramberg-Osgood Model: A Nondestructive Approach to Material Characterization", Mechanical Systems and Signal Processing, 224, 112087, 2025

• Park, S. H. et al., "Full-range stress–strain curve estimation of aluminum alloys using machine learning-aided ultrasound" Ultrasonics, 135, 107146, 2023