A5056918632- Laser-Plasma Interactions and Diagnostics
- Particle Accelerators and Free-Electron Lasers
- Laser Design and Applications
- Particle accelerators and beam dynamics
- Laser-Matter Interactions and Applications
- Advanced X-ray Imaging Techniques
- Gyrotron and Vacuum Electronics Research
- Laser-induced spectroscopy and plasma
- Spectroscopy and Laser Applications
- Atomic and Molecular Physics
- Solid State Laser Technologies
- Plasma Diagnostics and Applications
- Advanced Fiber Laser Technologies
- Photocathodes and Microchannel Plates
- Laser Material Processing Techniques
- Magnetic confinement fusion research
- Advanced Surface Polishing Techniques
- Ion-surface interactions and analysis
- Electron and X-Ray Spectroscopy Techniques
- Diamond and Carbon-based Materials Research
- Chalcogenide Semiconductor Thin Films
- Pulsed Power Technology Applications
- Terahertz technology and applications
- Advanced Electron Microscopy Techniques and Applications
- Superconducting Materials and Applications
Brookhaven National Laboratory
2015-2024
Accelerator Test Facility
2006-2024
University of California, Los Angeles
2010-2020
Particle Beam Lasers (United States)
2018
University of Southern California
2009-2010
Instituto Superior Técnico
2010
Los Alamos National Laboratory
2010
Imperial College London
2010
Stony Brook University
2010
University of Maryland, College Park
2010
A high-gain harmonic-generation free-electron laser is demonstrated. Our approach uses a laser-seeded to produce amplified, longitudinally coherent, Fourier transform-limited output at harmonic of the seed laser. carbon dioxide wavelength 10.6 micrometers produced saturated, amplified second-harmonic wavelength, 5.3 micrometers. The experiment verifies theoretical foundation for technique and prepares way application this in vacuum ultraviolet region spectrum, with ultimate goal extending...
We demonstrate that trains of subpicosecond electron microbunches, with spacing, can be produced by placing a mask in region the beam line where transverse size is dominated correlated energy spread. show number, length, and spacing microbunches controlled through parameters mask. Such microbunch further compressed accelerated have applications to free lasers plasma wakefield accelerators.
A strong energy modulation in an electron bunch passing through a dielectric-lined waveguide was recently demonstrated Antipov et al., Phys. Rev. Lett. 108, 144801 (2012). In this Letter, we demonstrate successful conversion of into beam density modulation, and the formation series microbunches with subpicosecond periodicity by means magnetic optics (chicane). coherent transition radiation signal produced is obtained tunability its carrier frequency 0.68--0.9 THz range regulating chirp...
We report generation of 5 TW peak power in a 2 ps pulse at 9.2 µm via chirped-pulse amplification (CPA) mixed-isotope high-pressure CO laser amplifiers. This represents the highest single picosecond format and shortest terawatt ever achieved long-wave infrared (LWIR) spectral range. Maximum demonstrated energy compressed is 14 J minimum period between shots 20 s. The successful implementation chirped technique short-pulse gas opens route to development LWIR facilities with tens terawatts...
A free relativistic electron in an electromagnetic field is a pure case of light-matter interaction. In the laboratory environment, this interaction can be realized by colliding laser pulses with beams produced from particle accelerators. The process single photon absorption and reemission electron, so-called linear Thomson scattering, results radiation that Doppler shifted into x-ray gamma-ray regions. At elevated intensity, nonlinear effects should come play when transverse motion...
Current filamentation instability is observed and studied in a laboratory environment with 60 MeV electron beam plasma capillary discharge. Multiple filaments are imaged transversely at the exit optical transition radiation. By varying density between single multiple found to be ${k}_{p}{\ensuremath{\sigma}}_{r}\ensuremath{\sim}2.2$. Scaling of transverse filament size skin depth predicted theory over range densities. Lowering bunch charge, thus density, suppresses instability.
We report the observation of coherent Cerenkov radiation in terahertz regime emitted by a relativistic electron pulse train passing through dielectric lined cylindrical waveguide. describe beam manipulations and measurements involved repetitive creation including comb collimation nonlinear optics corrections. With this technique, modes beyond fundamental are selectively excited use appropriate frequency train. The spectral characterization structure shows preferential excitation higher...
Staging of two laser-driven, relativistic electron accelerators has been demonstrated for the first time in a proof-of-principle experiment, whereby distinct and serial laser acted on an beam coherently cumulative manner. Output from ${\mathrm{CO}}_{2}$ was split into beams to drive inverse free lasers (IFEL) separated by 2.3 m. The IFEL served bunch electrons $\ensuremath{\sim}3\mathrm{fs}$ microbunches, which were rephased with wave second IFEL. This represents crucial step towards...
We report first evidence of wakefield acceleration a relativistic electron beam in dielectric-lined slab-symmetric structure. The high energy tail $\ensuremath{\sim}60\text{ }\text{ }\mathrm{MeV}$ was accelerated by $\ensuremath{\sim}150\text{ }\mathrm{keV}$ 2 cm-long, ${\mathrm{SiO}}_{2}$ waveguide, with the or deceleration clearly visible due to use bifurcated longitudinal distribution that serves approximate driver-witness pair. This split-bunch is verified reconstruction analysis emitted...
Chirped-pulse amplification (CPA) is an integral part of present-day ultra-intense laser systems that normally employ near-infrared (∼1 μm) solid-state lasers. The recently revived interest in expanding the reach strong-field physics into mid-infrared (mid-IR) spectral domain directs our attention to 9–11 μm carbon-dioxide (CO2) lasers for which progress reaching high peak intensities has been limited so far. We propose employing CPA technique will allow us realize a new breakthrough toward...
We demonstrate experimentally that a relativistic electron bunch shaped with sharp rising edge drives plasma wakefields one to seven periods along the as density is increased. The varied in 10(15)-10(17) cm(-3) range. generation observed after periodic modulation of correlated energy spectrum incoming bunch. choose low charge 50 pC for optimum visibility at all densities. longitudinal creating are MV/m range and indirect evidence transverse can seed self-modulation instability, although...
Optical materials transparent in the CO 2 laser wavelength range have been evaluated regarding their suitability for components ultrashort-pulse (≤ a few ps), high-peak-power (≥ TW) long-wave infrared (LWIR) lasers. We provide values nonlinear refractive index ( n ) seventeen materials, and onsets absorption eleven materials. Characterizations were performed using ps pulse at λ =9.2 μ m. This paper methodically presents newly acquired data conjunction with existing literature on linear...
We utilized a nonlinear post-compression technique to generate 675-fs, 9.2-μm CO 2 laser pulses with peak power of 1.6 TW. This achievement represents the highest ever attained in femtosecond pulse format within long-wave infrared (LWIR) spectral range. The successful implementation this opens avenues for development few-cycle, multi-terawatt 9–10 μm lasers, crucial applications currently relying on near-infrared solid-state and which stand benefit from scaling wavelengths into region.
We report on an experimental investigation characterizing the output of a high-gain harmonic-generation (HGHG) free-electron laser (FEL) at saturation. A seed CO2 wavelength 10.6 microm was used to generate amplified FEL 5.3 microm. Measurement frequency spectrum, pulse duration, and correlation length verified that light is longitudinally coherent. Investigation electron energy distribution harmonic energies provides evidence for saturated HGHG operation.
An electron beam microbunched on the optical wavelength scale of $\ensuremath{\approx}2.5\ensuremath{\mu}\mathrm{m}$ by an inverse free laser accelerator was observed. The optimum bunching achieved for a 1% energy modulation 32 MeV with 0.5 GW ${\mathrm{CO}}_{2}$ power. microbunching process investigated measuring coherent transition radiation produced modulated beam. A quadratic dependence signal charge observed shortest is less than $2.5\ensuremath{\mu}\mathrm{m}$. debunching...
We present results of an experiment where, using a 200 GW CO2 laser seed, 65 MeV electron beam was decelerated down to 35 in 54 cm long strongly tapered helical magnetic undulator, extracting over 30$\%$ the initial energy coherent radiation. These demonstrate unparalleled electro-optical conversion efficiencies for relativistic undulator field and represent important step development high peak average power radiation sources.
Long-wave infrared (LWIR) picosecond pulses with multi-terawatt peak power have recently become available for advanced high-energy physics and material research. Multi-joule pulse energy is achieved in an LWIR laser system via amplification of a microjoule seed high-pressure, mixed-isotope CO2 amplifiers. A chirped-pulse (CPA) scheme employed such to reduce the nonlinear interaction between optical field transmissive elements system. Presently, research development effort underway towards...
We have experimentally demonstrated the post-compression of a long-wave infrared (9.2 μm) 150 GW peak power pulse from 2 ps to less than 500 fs using sequence two bulk materials with negative group velocity dispersion (GVD). The compression resulted in up 1.6-fold increase and 2.8-fold intensity center quasi-Gaussian beam. partial decoupling self-phase modulation chirp compensation stages by significantly different ratios nonlinear refractive index GVD provides accurate optimization...
We report evidence of self-amplified spontaneous emission (SASE) at 1064 and 633 nm. To our knowledge, these are the first measurements SASE such a short wavelength employ smallest period wiggler, 8.8 mm, used to date in successful experiment. The experiments were performed with MIT microwiggler Accelerator Test Facility BNL. Single-pass, on-axis emissions within 25 nm bandwidth have been recorded as function beam charge show clear enhancement over emission. For measurement nm, single...
Laser-driven electron accelerators (laser linacs) offer the potential for enabling much more economical and compact devices. However, development of practical efficient laser linacs requires accelerating a large ensemble electrons together ("trapping") while keeping their energy spread small. This has never been realized before any acceleration system. We present here first demonstration high-trapping efficiency narrow via acceleration. Trapping efficiencies up to 80% spreads down 0.36% (1...
Thomson scattering of high-power laser and electron beams is a good test electrodynamics in the high-field region. We demonstrated production high-intensity X-rays head-on collision CO2 60-MeV at Brookhaven National Laboratory, Accelerator Test Facility. The energy an X-ray photon was limited 6.5 keV linear (lowest order) scattering, but nonlinear (higher process produces higher X-rays. measured angular distribution high-energy confirmed that it agrees with theoretical predictions.
A simple, passive method for producing an adjustable train of picosecond electron bunches is demonstrated. The key component this beam mask consisting array parallel wires that selectively spoils the emittance. This positioned in a high magnetic dispersion, low beta-function region line. incoming striking has time/energy correlation corresponds to time/position at location. pattern transformed into time or when dispersion brought back zero downstream mask. Results are presented...
Photoinduced ultrafast phase transitions can generate quasiequilibrium states with novel emergent properties modulated by the interplay of electronic and lattice degrees freedoms. Therefore, accurately probing transient atomic structures their dynamics is crucial to understand control interaction electrons but remains a central challenge science. Using MeV electron diffraction on single crystals, we quantitatively reveal photoinduced distortion monoclinic M1 VO2. Our results resolve previous...