Publications by authors named "T Popmintchev"
Article Synopsis
- A new imaging EUV-soft X-ray spectrometer and monochromator has been designed, achieving over 60% throughput efficiency and a high spectral resolution of λ/Δλ > 200 without using variable line spacing gratings.
- The system utilizes conical diffraction geometry for optimal imaging across a wide spectral range while preserving polarization states and ensuring minimal temporal dispersion, with pulse broadening confined to 80 fs.
- This versatile instrument can be easily converted into a monochromator, enabling coherent diffractive imaging in the EUV-soft X-ray range and enhancing the ability to study complex nano- and bio-systems with improved resolution, reaching the nanometer-femtosecond scale.
We demonstrate a high-energy, 1 kilohertz, Yb-based, femtosecond regenerative amplifier in a chirped pulse amplification (CPA) architecture by using a single disordered Yb:CALYO crystal, providing 125 fs pulses of 2.3 mJ energy per pulse at a central wavelength of 1039 nm. The amplified compressed pulses, with a spectral bandwidth of 13.
View Article and Find Full Text PDFWe present a generalized perturbative analytical formalism for evaluation and optimization of the chromatic dispersion of complex ultrafast optical systems. Notably, we identify polynomial and recursive relations associated with the chromatic dispersion orders that are identical to the Lah and Laguerre transforms. We explicitly outline the first ten dispersion terms and dispersion slope parameters and visualize the significance of the chromatic dispersion orders for several advanced ultrafast optical and photonic systems consisting of various optical materials and nanostructures, grating and prism-pair compressors, and hollow-core photonic anti-resonant fibers.
View Article and Find Full Text PDFWe demonstrate numerically and experimentally that intense pulses propagating in gas-filled capillaries can undergo localization in space and time due to strong plasma defocusing. This phenomenon can occur below or above the self-focusing threshold P as a result of ionization-induced refraction that excites higher-order modes. The constructive interference of higher-order modes leads to spatiotemporal localization and resurgence of the intensity.
View Article and Find Full Text PDFRecent advances in high-order harmonic generation have made it possible to use a tabletop-scale setup to produce spatially and temporally coherent beams of light with bandwidth spanning 12 octaves, from the ultraviolet up to x-ray photon energies >1.6 keV. Here we demonstrate the use of this light for x-ray-absorption spectroscopy at the K- and L-absorption edges of solids at photon energies near 1 keV.
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