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THz pulses up to 14 J energy and 0.7% efficiency were generated by ZnTe sources with tilted pulse front pumping at 1.7 μm, above the three-photon absorption edge. A monolithic ZnTe contact-grating source was demonstrated, which is scalable to mJ energies.
Virtually lossless self-compression of 10-mJ 3.9-um sub-100 fs pulses in bulk YAG resulting in 9-mJ 33-fs pulses is reported. Generated peak power exceeds 250 GW which is suitable for filamentation in ambient air.
2.7-μm microjoule femtosecond pulses are generated in a metal coated hollow fiber thru four-wave-mixing parametric amplification. Numerical simulations predict generation of few-cycle optical pulses with the central wavelength extending beyond 10 μm.
We present experimental and numerical progress in the development of nonlinear directional couplers based on multicomponent glass photonic crystal fibre. The first part of the paper reports a multi-wavelength nonlinear switch, operating in ultralong wavelength optical communication band, based on a special square lattice dual-core photonic crystal fibre excited with femtosecond pulses. The soliton-fission...
Self-compression of 2.2-mJ, 80-fs mid-IR pulses is achieved using a 1.5-mm-thick CaF2 plate. Femtosecond pulses with peak powers orders of magnitude higher than the self-focusing threshold can undergo self-compression without breaking up into multiple filaments.
Optical parametric chirped pulse amplification (OPCPA) is rapidly gaining ground as an approach to generate intense few-cycle pulses and reach IR wavelength ranges [1]. However, the high OPA gain has its negative side: for a bell-shaped intensity profile of the pump pulse/beam the unsaturated gain varies exponentially with intensity, resulting in an effective temporal/spatial filter. Here we demonstrate...
In this contribution we present the review of recent experimental and numerical investigations in a very new research field of nonlinear optics — interaction of high energy femtosecond mid-infrared laser pulses with matter. Following current developments in the field of optical parametric chirped pulse amplification (OPCPA) we have designed a sub-terawatt OPCPA laser system delivering 10 mJ, 80 fs...
The gain bandwidth of Ho-doped crystals is sufficiently broad to support femtosecond operation, which would allow pumping of ultrashort-pulse mid-IR optical parametric amplifiers (OPAs) [1,2] and, upon reaching adequate peak powers, eye-safe filamentation in the >2-μm transparency window of the atmosphere. In this contribution, we report on, to our knowledge, the first demonstration of a femtosecond...
Femtosecond Tm-fiber-laser-pumped Ho:YAG room-temperature CPA system delivering scalable multi-mJ multi-kHz pulses with a bandwidth exceeding 12 nm and the average power of 15 W is developed. Recompressed 530-fs pulses are suitable for broadband WL generation in transparent solids.
6-μJ, 6-μm pulses compressible to 1.5 optical cycles are generated in multistage OPA driven by 500-Hz Yb:CaF2-DPSSL. The system is favorable for verification of the predictions on λ-scaling of photoelectron wavepacket dynamics and atmospheric spectroscopy.
We demonstrate a compact 20-Hz-repetition-rate mid-IR OPCPA for application in high-field science which operates at 3900 nm with a FWHM bandwidth of 600 nm delivering 6-mJ pulses compressed to 75±10 fs (< 6 optical cycles).
We investigate attosecond electron tunnelling dynamics in a time-resolved pump-probe experiment on the generation of higher-order harmonics that are emitted due to a stepwise plasma concentration change occurring with each half-cycle of the pump-field.
By implementing heterodyne detection, we perform the first extensive study of a tunnelling- ionization-induced 3rd harmonic, showing a high sensitivity of its spectral amplitude and shape to quasi-periodic peaks of tunnelling ionization and target pre-ionization in the multi-photon regime. Following these initial gas- phase experiments, detailed background-free all-optical studies of tunnelling ionization...
We have demonstrated multimillijoule optically synchronized and passively carrier-envelope-phase (CEP) stable optical parametric chirped-pulse amplification (OPCPA) at 1.5(Ekspla Ltd.), which is seeded from the Yb master oscillator. In the amplification stages, we employ (nearly) collinear type-II phase matching in KTP/KTA reaching the pulse energy of -12.5 mJ at a 20-Hz repetition rate before a grating...
Single 4-mJ supercontinuum filaments supporting 8-fs pulses are generated by focusing ultrashort pulses from a four-stage KTP-OPCPA into a noble-gas cell. The use of a 1.6-mum wavelength permits efficient energy scaling in the single-filament regime.
We report the latest development of an OPCPA system, generating carrier-envelope-phase-stable 650-muJ 15-fs pulses around 2.1 mum. A novel seed-spectral-shaping method is used to resolve the non-trivial problem of ascertaining the true amplified signal energy.
We review progress in the development of kilohertz-repetition-rate few-cycle optical parametric chirped pulse amplifiers (OPCPA) in the near-IR (700-1000 nm) and IR (1700-2800 nm) spectral ranges. These sources hold promise for applications in extreme nonlinear optics and attosecond physics.
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