Construct a Time Resolved Atomic Probe of Surfaces (TRAPS) instrument to study atomic scale ultrashort pulse laser induced surface defects
Abstract
We propose to construct the Time Resolved Atomic Probe of Surfaces (TRAPS), a unique custom system that incorporates various ultra-fast laser sources with a commercially available atomic resolution surface probe to study ultra-short pulse laser induced surface defect state dynamics and incorporate the experimental results to existing laser damage modeling framework for a more robust and predictive femtosecond laser damage simulation capability. The TRAPS instrument would be used to enhance the scope of research and capability of an existing (2016-2020) Air Force Office of Scientific Research grant titled, “Fundamentals of femtosecond laser induced damage of solids: advancement through experimental, computational and theoretical development."Components of TRAPS are described as follows: a bolt-on scanning-tunneling-microscope (STM) and atomic force microscope (AFM) system from RHK technologies, combined with a loadlock transfer arm (sample loader) and a wobble stick (sample manipulator), which will be purchased and assembled onto an existing dedicated ultra-high vacuum (UHV) chamber with vacuum pumps. A dedicated optical delay line with custom focusing system will allow ultrafast pulses of wide ranging wavelengths (200 – 4500 nm) and pulse durations (5 – 150,000 femtoseconds) to illuminate the samples in two modes: i) successive pulse analysis mode, where minute surface changes after each pulse interacts with the sample is recorded by scanning probes, and ii) time resolved pump-pump or pump-probe modes, where the scanning probe signals are locked onto the repetition rate of the pulse pair, and collected as a function of time delay between them.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Aug 28, 2018
- Source ID
- FA95501810378
Entities
People
- Enam Chowdhury
Organizations
- Air Force Office of Scientific Research
- Ohio State University
- United States Air Force