A5009214578- Advanced X-ray Imaging Techniques
- Laser-Matter Interactions and Applications
- Laser-Plasma Interactions and Diagnostics
- Advanced Electron Microscopy Techniques and Applications
- Advanced Fiber Laser Technologies
- Digital Holography and Microscopy
- Solid State Laser Technologies
- X-ray Spectroscopy and Fluorescence Analysis
- Magnetic properties of thin films
- Mass Spectrometry Techniques and Applications
- Magneto-Optical Properties and Applications
- Advanced Fluorescence Microscopy Techniques
- Heusler alloys: electronic and magnetic properties
- Advancements in Photolithography Techniques
- Spectroscopy and Laser Applications
- 2D Materials and Applications
- Spectroscopy and Quantum Chemical Studies
- Surface and Thin Film Phenomena
- Adaptive optics and wavefront sensing
- Calibration and Measurement Techniques
- Lower Extremity Biomechanics and Pathologies
- Laser Design and Applications
- Optical Coherence Tomography Applications
- Ion-surface interactions and analysis
- Diabetic Foot Ulcer Assessment and Management
University of Colorado Boulder
2009-2023
Joint Institute for Laboratory Astrophysics
2009-2020
U.S. National Science Foundation
2009
National Institute of Standards and Technology
2009
We show how bright, fully coherent, hard x-ray beams can be generated through nonlinear upconversion of femtosecond laser light. By using longer-wavelength mid-infrared driving lasers moderate peak intensity, full phase matching the high harmonic generation process extend, in theory, into region spectrum. identify dominant mechanism for long wavelength lasers, and verify our predictions experimentally by demonstrating phase-matched up-conversion soft spectrum around 330 eV an extended,...
Next-generation nano and quantum devices have increasingly complex 3D structure. As the dimensions of these shrink to nanoscale, their performance is often governed by interface quality or precise chemical dopant composition. Here we present first phase-sensitive extreme ultraviolet imaging reflectometer. It combines excellent phase stability coherent high-harmonic sources, unique chemical- phase-sensitivity reflectometry, state-of-the-art ptychography algorithms. This tabletop microscope...
Femtosecond light pulses can directly and nearly instantaneously manipulate spins in half-metallic Heusler materials.
We present a 100 kHz 2D IR spectrometer. The system utilizes ytterbium all normal dispersion fiber oscillator as common source for the pump and seed beams of MgO:PPLN OPCPA. 1030 nm OPCPA is generated by amplification in cryocooled Yb:YAG amplifiers, while 1.68 μm OPO pumped oscillator. outputs are used ZGP DFG stage to generate 4.65 pulses. A mid-IR pulse shaper delivers pairs spectrometer allowing data collection at kHz.
Lensless imaging with short-wavelength light is a promising method for achieving high-resolution, chemically sensitive images of wide variety samples. The use 13 nm illumination particular interest materials science and the next-generation nanofabricated devices. Prior to this work, there was an unmet need microscope that can image general samples extreme ultraviolet light, which requires reflection geometry. Here, we fulfill by performing lensless using high-harmonic beam at grazing...
By focusing a high repetition rate (50 kHz), compact, femtosecond laser system with low pulse energy (25 muJ) using tight-focusing geometry, we demonstrate fully phase matched high-order harmonic generation for the first time at very rates, resulting in EUV light full spatial coherence. The result is practical, single-box, coherent source useful applications metrology, ultrafast spectroscopy, imaging and microscopy. soft x-ray flux can be improved further by increasing and/or rate.
We demonstrate through theory and experiment that scaling of perfect phase matching in high harmonic generation is surprisingly favorable as the wavelength driving laser increased, enabling ultrafast, fully coherent, multi-keV x-ray sources.
It has long been known that the magnetic order in a material can be transiently disrupted by an intense laser pulse, on surprisingly fast sub-picosecond timescales. However, two decades after its discovery, microscopic physics underlying this behavior is still not completely understood. Here, authors develop new extreme ultraviolet (EUV) magneto-optical spectroscopy allows them to extract full...
We describe a kHz repetition-rate mid-IR laser system based on OPCPA, optimized for soft x-ray high harmonic generation. To date we have demonstrated 1.4mJ at 1.6µm, and 550µJ 3µm, each with bandwidth compressible to <100fs.
Get PDF Email Share with Facebook Tweet This Post on reddit LinkedIn Add to CiteULike Mendeley BibSonomy Citation Copy Text M. -. Chen, P. Arpin, T. Popmintchev, Gerrity, Seaberg, B. Zhang, D. A. Bahabad, Murnane, and H. C. Kapteyn, "Bright, Coherent, Attosecond Soft X-Ray Harmonics Spanning the Water Window from a Tabletop Source," in International Conference Ultrafast Phenomena, OSA Technical Digest (CD) (Optica Publishing Group, 2010), paper TuA3. Export BibTex Endnote (RIS) HTML Plain...
EUV lithography is promising for addressing upcoming, <10nm nodes the semiconductor industry, but with this promise comes need reliable metrology techniques. In particular, there a actinic mask inspection in which imaging wavelength matches that of intended process, so most relevant defects are detected. Here, we demonstrate tabletop, ptychographic, coherent diffraction (CDI) reflection- and transmission-modes extended samples, using 13 nm high harmonic generation (HHG) source. We achieve...
I will present work on hybrid fiber/bulk systems employing non-linear amplifiers to reach near and mid-IR wavelengths obtain high peak average powers, with <100 femtosecond pulse durations. These have a wide range of uses from biotech imaging techniques, hard X-ray generation, industrial/medical micromachining. illustrate our specific designs for pushing the limits fiber laser technology, mating it solid state lasers, extending these meet needs cutting edge science.
We combine the attosecond physics of high harmonic generation with phase-matching in extreme nonlinear optics to demonstrate bright coherent upconversion into X-ray spectral region using longer wavelength mid-IR lasers.
We demonstrate a 60MHz, cryogenically cooled, mode-locked Yb:YAG oscillator with up to 12W average output power. Mode-locking is achieved via SESAM, an intracavity SHG crystal, and iris near focus for spatial mode filtering.
By focusing a 2 µm driving laser into multi-atmosphere pressure, gas-filled waveguide, we demonstrate full phase matching of high harmonic x-rays throughout the water window for first time, at energies > 0.5 keV.
We present a mid-IR OPCPA laser producing multi-mJ femtosecond pulses at 1kHz. The beam profile of the 3.1µm idler is excellent, enabling efficient coupling into high-gas-pressure waveguides, required for phase matched 1keV high harmonic generation.
We present a multi-mJ, 1 kHz repetition-rate, mid-IR OPCPA laser, for soft x-ray high harmonic generation. To date we have demonstrated 2.7mJ at 1.6μm, and 1.1mJ 3μm, with sufficient bandwidth in each to support <100fs compression.
A grand challenge in semiconductor metrology has been the nondestructive characterization 3D nanostructures and their multilayer structure, interfaces, dopant concentrations. We combine extreme ultraviolet reflectometry with state-of-the-art ptychography imaging algorithms to achieve this goal.
We report the first efficient source of spatially-coherent extreme-UV light at high repetition rates (>50kHz) needed for metrology and imaging applications. This practical compact tabletop EUV uses IR pulse energy only 25μJ.
We generate fully spatially coherent soft x-ray beams in the water window region of spectrum using phase matched high harmonic upconversion a 2 µm driving laser.
By tightly focusing a high repetition rate (50kHz), compact, femtosecond laser system with low pulse energy (25μJ), we demonstrate fully phase matched, spatially coherent, 50kHz harmonic beams for the first time.