A5086374811- Laser-Matter Interactions and Applications
- Laser-Plasma Interactions and Diagnostics
- Advanced Fiber Laser Technologies
- Solid State Laser Technologies
- Laser Design and Applications
- Adaptive optics and wavefront sensing
- Advanced X-ray Imaging Techniques
- Photorefractive and Nonlinear Optics
- Optical Systems and Laser Technology
- Laser Material Processing Techniques
- Optical measurement and interference techniques
- Laser-induced spectroscopy and plasma
- Advanced Optical Sensing Technologies
- Ocular and Laser Science Research
- Particle accelerators and beam dynamics
- Optical Coatings and Gratings
- High-pressure geophysics and materials
- Advanced Optical Imaging Technologies
- Particle Accelerators and Free-Electron Lasers
- Photonic and Optical Devices
- Optical Wireless Communication Technologies
- Quantum optics and atomic interactions
- Terahertz technology and applications
- Advancements in Photolithography Techniques
- Orbital Angular Momentum in Optics
University of Rochester
2016-2025
Energetics (United States)
2010-2023
Applied Energetics (United States)
2018-2023
University of Michigan
2001-2018
Optical Sciences (United States)
2003-2005
We generated a record peak intensity of 0.7 x 10(22) W/cm2 by focusing 45-TW laser beam with an f/0.6 off-axis paraboloid. The aberrations the paraboloid and low-energy reference were measured corrected, focal spot size 0.8 microm was achieved. It is shown that can be increased to 1.0 correction wave front relative beam. phase amplitude measurement provides for efficient full characterization field.
Optical parametric chirped-pulse amplification (OPCPA) [Dubietis et al. , Opt. Commun. 88 437 (1992)] implemented by multikilojoule Nd:glass pump lasers is a promising approach to produce ultraintense pulses ( ${>}10^{23}~\text{W}/\text{cm}^{2}$ ). Technologies are being developed upgrade the OMEGA EP Laser System with goal an optical amplifier line (EP OPAL) two of beamlines. The resulting (1.5 kJ, 20 fs, $10^{24}~\text{W}/\text{cm}^{2}$ ) would be used jointly picosecond and nanosecond...
Abstract Optical parametric chirped-pulse amplification implemented using multikilojoule Nd:glass pump lasers is a promising approach for producing ultra-intense pulses (>10 23 W/cm 2 ). We report on the MTW-OPAL Laser System, an optical amplifier line (OPAL) pumped by Nd:doped portion of multi-terawatt (MTW) laser. This midscale prototype was designed to produce 0.5-PW with technologies scalable tens petawatts. Technology choices made were guided longer-term goal two full-scale OPALs...
A chirped laser pulse focused by a chromatic lens exhibits dynamic, or "flying," focus in which the trajectory of peak intensity decouples from group velocity. In medium, flying can trigger an ionization front that follows this trajectory. By adjusting chirp, be made to travel at arbitrary velocity along optical axis. We present analytical calculations and simulations describing propagation pulse, self-similar form its profile, wave formation. The ability control speed and, conjunction,...
A high-resolution, high-precision beam-shaping system for high-power-laser systems is demonstrated. liquid-crystal-on-silicon spatial light modulator run in closed-loop to shape laser-beam amplitude and wavefront. An unprecedented degree of convergence demonstrated, important practical issues are discussed. Wavefront shaping the applications OMEGA EP laser other interesting examples presented.
Conventional lens-based image relays introduce radial group delay that significantly reduces focal-spot intensity of ultra-broadband short pulses. A direct compensation scheme can be used with conventional singlet is proposed. The based on using two negative lenses embedded within an Offner imaging system. setup allows a single-pass configuration and eliminates the need for polarization switching optics. performance this calculated ray tracing. improves spatiotemporal Strehl ratio from 0.02 to 0.97.
An advanced focusing scheme, called a “flying focus,” uses chromatic system combined with broadband laser pulse its colors arranged in time to propagate high intensity focus over distance that can be much greater than Rayleigh length while decoupling the speed at which peak propagates from group velocity. The flying generates short effective duration small diameter focal spot co- or counter-propagates along optical axis any Experiments validating concept measured subluminal (−0.09c)...
Abstract Large scale laser facilities are needed to advance the energy frontier in high physics and accelerator physics. Laser plasma accelerators core advanced concepts aimed at reaching TeV electron colliders. In these facilities, intense pulses drive plasmas used accelerate electrons energies remarkably short distances. A could principle reach with an accelerating length that is 1000 times shorter than conventional RF based accelerators. Notionally, driven particle beam beyond state of...
An on-shot focal-spot diagnostic for characterizing high-energy, petawatt-class laser systems is presented. Accurate measurements at full energy are demonstrated using high-resolution wavefront sensing in combination with techniques to calibrate low-power sample beams. Results shown full-energy activation shots of the OMEGA EP Laser System.
Target-plane intensities on the short-pulse beamlines of OMEGA EP, a petawatt-class laser, are characterized on-shot using focal-spot diagnostic (FSD), an indirect wavefront-based measurement. Phase-retrieval methods employed and offline camera-based far-field measurements to improve wavefront yield more-accurate, repeatable predictions. Incorporation these techniques has improved mean cross-correlation between FSD predictions direct fluence in target chamber from 0.78 0.94.
The multiterawatt (MTW) laser, built initially as the prototype front end for a petawatt laser system, is 1053 nm hybrid system with gain from optical parametric chirped-pulse amplification (OPCPA) and Nd:glass. Compressors target chambers were added, making MTW complete facility (output energy up to 120 J, pulse duration 20 fs 2.8 ns) studying high-energy-density physics developing short-pulse technologies diagnostics. Further extensions of support ultrahigh-intensity development an...
Isolated attosecond pulses and electron bunches can be efficiently generated in the interaction of intense lasers with plasma confined volume λ3 regime. Scaling intensity is found to improve pulse brevity focusability greatly while efficiency generation continues remain high. Practical consideration tools needed generate such indicates that interactions are surprisingly accessible. We mention some introductory experiments whereby we may verify theoretical predictions this new class pulses....
A beam-shaping system, based on a liquid-crystal-on-silicon spatial light modulator, has been deployed two of the long-pulse UV beamlines OMEGA EP laser. Simultaneous control both amplitude and phase with single modulator is possible by encoding intensity information high-frequency carrier phase, which subsequently removed low-pass filter. The system integrated into operations existing front-end laser source demonstrated improved beam uniformity at multiple points in operates closed loop to...
We present an on-shot focal-spot characterization technique based on a phase-retrieval scheme that retrieves near-field phase from multiplane measurements in experimental target chamber. The is easy to implement inside chamber and demonstrated multiterawatt laser system. It also found retrieval can quantitatively detect residual angular dispersion coming the pulse compressor misalignment.
Spatio-temporal coupling in the field of ultrashort optical pulses is a technical enabler for applications but can result detrimental effects such as increased on-target pulse duration and decreased intensity. Spectrally resolved spatial-phase measurements broadband are demonstrated using custom multispectral camera combined with two different wavefront sensors: multilateral spatial shearing interferometer based on an amplitude checkerboard mask apodized imaged Hartmann sensor. The spatially...
Partially deuterated potassium dihydrogen phosphate (DKDP) allows for the optical parametric chirped-pulse amplification of high-energy broadband pulses to generate ultrashort, high-peak-power pulses. Modeling and experimental optimization noncollinear interaction geometry require combination a model deuteration-dependent indices knowledge deuteration level DKDP crystal being used. We study demonstrate novel technique that determines consistent with specific index model, based on...
New algorithms for reconstructing wavefront from slopes data are developed, which exhibit high accuracy over broad spatial-frequency bandwidth. Analyzing reconstructors in the frequency domain lends new insight into ways to improve response and understand noise propagation. The mathematical tools required analyze first developed discrete band-limited signals. These shown either spatial-or frequency-domain reconstruction algorithms. A spatial-domain iterative algorithm based on Simpson rule...
Combining a chirped laser pulse with chromatic lens yields flying focus—a focus that moves dynamically in time. This provides control over the propagation of peak intensity within an extended focal region can be many times larger than system's Rayleigh length. Any velocity is achievable, including backward relative to direction. Previous simulation results have shown beam create counter-propagating ionization wave and subsequently pump frequency-downshifted via stimulated Raman scattering...
A simple diagnostic characterizing one-dimensional chromatic aberrations in a broadband beam is introduced. Ronchi grating placed front of spectrometer entrance slit provides spectrally coupled spatial phase information. The radial-group delay refractive system and the pulse-front wedged glass plate have been characterized accurately demonstration experiment.
A spot-shadowing technique to mitigate damage growth in a high-energy laser is studied. Its goal minimize the energy loss and undesirable hot spots intermediate planes of laser. nonlinear optimization algorithm solves for complex fields required National Ignition Facility amplifier chain. The method generally applicable any large fusion
The scope and status of a mid-scale optical parametric amplifier line (OPAL) that will demonstrate scalable technologies be presented along with technical challenges prospects for an OPAL pumped by OMEGA EP.