A5074879823- Advanced Fiber Laser Technologies
- Laser-Matter Interactions and Applications
- Solid State Laser Technologies
- Photonic Crystal and Fiber Optics
- Physics of Superconductivity and Magnetism
- High-pressure geophysics and materials
- Adaptive optics and wavefront sensing
- Advanced Condensed Matter Physics
- Superconducting Materials and Applications
- Laser-Plasma Interactions and Diagnostics
- Astro and Planetary Science
- Advanced Fiber Optic Sensors
- Space exploration and regulation
- Optical Systems and Laser Technology
- Magnetic and transport properties of perovskites and related materials
- Diamond and Carbon-based Materials Research
- Semiconductor Quantum Structures and Devices
- Optical Network Technologies
- Stellar, planetary, and galactic studies
- Optical Coherence Tomography Applications
- Advanced optical system design
- solar cell performance optimization
- Advanced X-ray Imaging Techniques
- Spectroscopy Techniques in Biomedical and Chemical Research
- Space Science and Extraterrestrial Life
Joint Institute for Laboratory Astrophysics
2023
SLAC National Accelerator Laboratory
2018-2022
Linac Coherent Light Source
2018-2022
University of California, Santa Barbara
2019-2021
Superconductivity and charge density waves (CDWs) are competitive, yet coexisting, orders in cuprate superconductors. To understand their microscopic interdependence, a probe capable of discerning interaction on its natural length time scale is necessary. We use ultrafast resonant soft x-ray scattering to track the transient evolution CDW correlations YBa2Cu3O6+x after quench superconductivity by an infrared laser pulse. observe nonthermal response order characterized near doubling...
We report a compact and reliable ultrafast fiber laser system optimized for seeding high energy, 2 μ m pumped, 3 wavelength optical parametric chirped pulse amplification to drive soft X-ray harmonics. The delivers 100 MHz narrowband pulses with >1 nJ synchronized ultra-broadband ∼1 FWHM spectrum centered at 39 pJ energy. are derived from single 1.5 oscillator, fully integrated free-space downconversion the m. operates hands-off power instabilities <0.2% over extended periods of time.
Directed energy phased array (DEPA) systems have been proposed for novel applications such as beaming optical power electrical use on remote sensors, rovers, spacecraft and future moon bases, well planetary defense against asteroids photonic propulsion up to relativistic speeds. All scenarios involve transmission through atmosphere beam perturbations due turbulence which must be quantified. Numerical propagation feedback control simulations were performed using an algorithm optimized...
We report on a compact fiber-based front-end that delivers 14-nJ, 2 μm wavelength optical pulses at 100 MHz tailored to seed high energy Ho:YLF regenerative amplifier and synchronous with broadband 2.5-3.5 pulses.
We report the generation of 250 μJ, near transform-limited 2.4-cycle duration, 3 μm wavelength pulses at 1 kHz repetition rate via nonlinear self-compression in a multi-pass cell.
We report the generation of high harmonics in an anti-resonant hollow-core fiber driven by ultrastable ~0.3% RMS, kHz laser at 3 µm wavelength. This geometry enables lower-loss guiding mid-IR lasers.
We report emission cross-section, absorption cross-section and excited-state lifetime measurements of Ho:CaF 2 Ho:YLF(θ) at room cryogenic temperatures. also numerical simulations confirming sub-ps amplification to the 10-mJ, 1-kHz level using these materials.
We report our progress developing a high average power ultrafast OPCPA at 1.5-μm pumped by multi-channel Yb-fiber laser. The pump laser delivers 200-μJ, 250-fs pulses 1-MHz repetition rate and parametric amplification was demonstrated.
We evaluate the feasibility of implementing a polarization diverse scheme to facilitate beacon based phase locking long baseline laser phased array.
We evaluate the performance of a 10 W CW Ytterbium doped fiber amplifier system operating at 1064 nm suitable for use in laser phased array directed energy system. The is optimized beacon based topology.
Directed energy (DE) systems composed of large numbers combined laser beams have been proposed for a number applications, including illumination photovoltaic cells on the moon and spacecraft propulsion. It is important to understand how design parameters these perturbations such as misalignment phase error affect their performance. also useful evaluate effects amplitude screens. This paper describes development tool that can simulate beam profile over ten billion coherently elements at...
Directed energy propulsion for interstellar travel has been proposed as an ideal method reaching appreciable speeds relative to the speed of light: 0.2c. However, amount required necessitates a large aperture, on order kilometers, while mitigation atmospheric perturbations requires discretization aperture into many individual laser elements. The use fiber lasers these elements obligates mode-matching desired 10 cm collimated beam. Various collimation systems were designed and compared. A...
We present a fiber-based laser delivering synchronized pulses at 2 μm and 3 wavelengths to seed an OPCPA system. The simple architecture provides robust, stable mid-IR light for amplification generate SXR high harmonics.
We report the generation of soft X-ray radiation up to carbon K-edge (284 eV) in nitrogen gas driven by a millijoule-class 3 µm OPCPA featuring 135 fs pulses at 1 kHz repetition rate.
We report optical pump–soft X-ray scattering probe studies of YBCO single crystals. The experiments reveal a picosecond relaxation dynamics charge density waves, which is in turn strongly modified by the onset superconductivity.
We report on phase and intensity pulse shaping of the 1.5-μm signal beam a 3-μm wavelength OPCPA system. This shaper associated algorithms enable in-situ optimization nonlinear processes driven at mid-IR wavelengths.
We report a robust, 3µm wavelength OPCPA system with sub-mJ pulse energies at 1kHz repetition rate. The use of high-pressure hollow-core waveguides, both regular and anti-resonant, provide pathway for phase-matched soft X-ray generation.
We report a compact, cryogenic Yb:YAG regenerative amplifier that delivers >19-mJ energy pulses at 1-kHz with near-TEM00 spatial profile. The excellent power and pointing stabilities are ideal for OPCPA pumping over weeks-long continuous operation.
We report a robust long-term stable >19mJ energy, 1kHz repetition rate cryogenic Yb:YAG regenerative amplifier and its application in pumping mJ-class, 3µm wavelength OPCPA. highlight the benefits of cryo-Yb:YAG over alternative systems.