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12 papers
Attosecond Rabi Oscillations in High Harmonic Generation Resonantly Driven by Extreme Ultraviolet Laser Fields
Alba de las Heras, Carlos Hernández-García, Javier Serrano +4
High-order harmonic generation driven by intense extreme ultraviolet (EUV) fields merges quantum optics and attosecond science, giving rise to an appealing route for the generation…
Phase matching of high harmonic generation in the soft and hard X-ray regions of the spectrum
Tenio Popmintchev, Ming-Chang Chen, Alon Bahabad +6
We show how bright, fully coherent, hard x-ray beams can be generated through nonlinear upconversion of femtosecond laser light. By using longer-wavelength mid-infrared driving las…
Phase-Matching of High-Order Harmonics Driven by Mid- Infrared Light
Tenio Popmintchev, Ming-Chang Chen, Oren Cohen +4
We demonstrate that phase-matched frequency upconversion of ultrafast laser light can be extended to shorter wavelengths by using longer driving laser wavelengths. Experimentally,…
Bright Coherent Ultrahigh Harmonics in the keV X-Ray Regime from Mid-Infrared Femtosecond Lasers
Tenio Popmintchev, Ming-Chang Chen, Dimitar Popmintchev +17
High harmonic generation traditionally combines ~100 near-infrared laser photons, to generate bright, phase matched, extreme ultraviolet beams when the emission from many atoms add…
Continuously Red-Shift and Blue-Shift Wavelength-Tuneable, Narrowband, High Harmonics in the EUV - X-ray Regime for Resonance Imaging and Spectroscopies
Dimitar Popmintchev, Aref Imani, Paolo Carpegiani +12
We demonstrate a novel technique for producing high-order harmonics with designer spectral combs in the extreme ultraviolet-soft X-ray range for resonance applications using spectr…
High-performance ultrafast pulse compression in the visible spectral range for extreme nonlinear optics at kHz-MHz repetition rates
Siyang Wang, Jieyu Yan, Sirius Song +5
We demonstrate a remarkably effective single-stage compression technique for ultrafast pulses in the visible electromagnetic spectrum using second-harmonic pulses at 515 nmderived…
Ultrafast Ultraviolet C and Visible Laser Light with Broadly Tunable Spectrum
Dimitar Popmintchev, Aref Imani, Paolo Carpegiani +11
We demonstrate a versatile technique for generating continuously wavelength-tunable laser waveforms, with mJ pulse energies and ultrashort pulse durations down to few-cycle in the…
Theory of the Chromatic Dispersion, Revisited
Dimitar Popmintchev, Siyang Wang, Xiaoshi Zhang +1
We derive general analytic expressions for the chromatic dispersion orders valid to infinity, due to the k vector or phase ϕ dependence on the wavelength. Additionally, we identify…
High flux coherent supercontinuum soft X-ray source driven by a single-stage 10 mJ, kHz, Ti:sapphire laser amplifier
Chengyuan Ding, Wei Xiong, Tingting Fan +6
We demonstrate the highest flux tabletop source of coherent soft X-rays to date, driven by a single-stage 10 mJ Ti:sapphire regenerative amplifier at 1 kHz. We first down-convert t…
Generation of phase-matched circularly-polarized extreme ultraviolet high harmonics for magnetic circular dichroism spectroscopy
Ofer Kfir, Patrik Grychtol, Emrah Turgut +10
Circularly-polarized extreme UV and X-ray radiation provides valuable access to the structural, electronic and magnetic properties of materials. To date, this capability was availa…
Generation of Bright Isolated Attosecond Soft X-Ray Pulses Driven by Multi-Cycle Mid-Infrared Lasers
M. -C. Chen, C. Hernández-García, C. Mancuso +11
High harmonic generation driven by femtosecond lasers makes it possible to capture the fastest dynamics in molecules and materials. However, to date the shortest attosecond (as) pu…
Ultrafast modulation of the chemical potential in BaFeAs by coherent phonons
L. X. Yang, G. Rohde, T. Rohwer +18
Time- and angle-resolved extreme ultraviolet photoemission spectroscopy is used to study the electronic structure dynamics in BaFeAs around the high-symmetry points and…