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Strong-field, single-cycle THz fields accelerate electrons with peak energies of up to 0.75 keV in a millimeter-sized THz gun with bunch charge of 45 fC. Energy spreads as low as 5.8% were also achieved.
Over the past decades, advances in ultrafast technologies led to the generation of intense ultrashort THz to optical pulses with single-cycle pulse duration. Using such ultrashort pulses for electron acceleration offers advantages in terms of higher thresholds for material breakdown which opens up a promising path towards increased acceleration gradients. In this contribution, we present the first...
Ultrafast terahertz (THz) transients are of great interest for linear and nonlinear THz spectroscopy and compact particle acceleration. Tilted-pulse-front (TPF) [1] THz generation in lithium niobate (LN) has become ubiquitous due to its compatibility with easily accessible high-power 800 nm/1 µm laser technology. However, the use of diffraction grating (DG) based TPFs (DG-TPFs) present formidable...
We report on a record 2% extracted optical-to-terahertz conversion efficiency in the mm-wavelength range through optical rectification in cryogenically-cooled lithium niobate by exploiting spatial and temporal shaping of the optical pump beam.
Highly efficient generation of strong-field terahertz (THz) pulses by using very short laser pulses ∼30 fs has some challenges due to chromatic aberrations. Here, we demonstrate an optical-to-THz conversion efficiency of 0.2% using a 3 mJ pump pulse energy. This result paves the way for strong-field applications of THz radiation.
We experimentally observe the acceleration of photo-electrons in a single-cycle terahertz (THz) field centered at 0.45 THz. The electrons are emitted from a copper surface via two-photon ionization of ∼0.5 ps green laser pulses, and then accelerated by a THz pulse incident at an oblique angle. Electron acceleration up to 64 eV is demonstrated in a THz field strength of 72 MV/m.
We demonstrate high optical-to-THz conversion efficiency of 3.8% by optical rectification in cryogenically-cooled lithium niobate using near-optimum 680 fs, 1.2 mJ pump pulses centered at 1 μm. Spatial and temporal characterization will be presented.
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