Edgar Kaksis
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View article: Suppression of Kerr-induced satellites in multi-pulse CPA
Suppression of Kerr-induced satellites in multi-pulse CPA Open
Amplification of bursts of ultrashort pulses is very challenging when the intraburst repetition frequency reaches the THz range, corresponding to (sub)-ps intervals between consecutive pulses. Periodic interference significantly modifies c…
View article: Suppression of Kerr-Induced Satellites in Multi-Pulse CPA
Suppression of Kerr-Induced Satellites in Multi-Pulse CPA Open
Amplification of bursts of ultrashort pulses is very challenging when the intraburst repetition frequency reaches the THz range, corresponding to (sub)-ps intervals between consecutive pulses. Periodic interference significantly modifies c…
View article: Frequency-mode-stable regenerative amplification at terahertz burst rates
Frequency-mode-stable regenerative amplification at terahertz burst rates Open
Generation of high-fidelity amplified pulse bursts with a regular interpulse interval yields, in the spectral domain, an equidistant pattern of narrowband spectral modes, similar to frequency combs produced by cw mode-locked lasers but wit…
View article: Pulse non-linear post-compression with tunable wavelength by balancing SPM and SRS
Pulse non-linear post-compression with tunable wavelength by balancing SPM and SRS Open
In non-linear pulse spectral broadening via SPM, the original central wavelength is preserved; with SRS, it is red-shifted by an amount related to the broadening. We show that, by balancing SPM and SRS, red-shift and broadening can be tune…
View article: Methods and Applications for Amplified Bursts of Picosecond-Spaced Ultrashort Pulses
Methods and Applications for Amplified Bursts of Picosecond-Spaced Ultrashort Pulses Open
Generating packages of picosecond-spaced ultrashort pulses yields various advantages in their application in nonlinear spectroscopy, micromachining, and plasma generation. We outline methods of burst amplification, with a focus on recent a…
View article: Amplification of Long-Wave Infrared Pulses in a Multicolor Non-Collinearly Pumped OPCPA for High-Energy Output
Amplification of Long-Wave Infrared Pulses in a Multicolor Non-Collinearly Pumped OPCPA for High-Energy Output Open
Non-collinearly-seeded, KTA-based NOPCPA is used to generate multicolor, angularly separated pump pulses above 2 μm wavelength. These multicolor pump channels are used to amplify LWIR pulses in a non-collinearly-pumped ZGP NOPCPA to sub-mJ…
View article: Spectral peak recovery in parametrically amplified THz-repetition-rate bursts
Spectral peak recovery in parametrically amplified THz-repetition-rate bursts Open
Multi-photon resonant spectroscopies require tunable narrowband excitation to deliver spectral selectivity and, simultaneously, high temporal intensity to drive a nonlinear-optical process. These contradictory requirements are achievable w…
View article: Continuously Red-Shift and Blue-Shift Wavelength-Tuneable, Narrowband, High Harmonics in the EUV - X-ray Regime for Resonance Imaging and Spectroscopies
Continuously Red-Shift and Blue-Shift Wavelength-Tuneable, Narrowband, High Harmonics in the EUV - X-ray Regime for Resonance Imaging and Spectroscopies Open
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 spectrally controlled visible lasers. Our approach enables contin…
View article: Ultrafast Ultraviolet C and Visible Laser Light with Broadly Tunable Spectrum
Ultrafast Ultraviolet C and Visible Laser Light with Broadly Tunable Spectrum Open
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 ultraviolet C and visible spectral ranges. Using the proces…
View article: Spectral Peak Recovery in Parametrically Amplified THz-Repetition-Rate Bursts
Spectral Peak Recovery in Parametrically Amplified THz-Repetition-Rate Bursts Open
Multi-photon resonant spectroscopies require tunable narrowband excitation to deliver spectral selectivity and, simultaneously, high temporal intensity to drive a nonlinear-optical process. These contradictory requirements are achievable w…
View article: Rapid-Scan Nonlinear Time-Resolved Spectroscopy over Arbitrary Delay Intervals
Rapid-Scan Nonlinear Time-Resolved Spectroscopy over Arbitrary Delay Intervals Open
Femtosecond dual-comb lasers have revolutionized linear Fourier-domain spectroscopy by offering a rapid motion-free, precise, and accurate measurement mode with easy registration of the combs beat note in the radio frequency domain. Extens…
View article: Generation of phase-stable sub-mJ ultrashort laser pulse bursts with extremely high scalable pulse number
Generation of phase-stable sub-mJ ultrashort laser pulse bursts with extremely high scalable pulse number Open
We demonstrate generation of bursts that consist of up to 40 ultrashort pulses with 10 μJ pulse energy, 250 fs pulse duration and an ultrashort tunable spacing, from picoseconds to nanoseconds, corresponding to a terahertz intraburst repet…
View article: HHG at the Carbon K-Edge Directly Driven by SRS Red-Shifted Pulses from an Ytterbium Amplifier
HHG at the Carbon K-Edge Directly Driven by SRS Red-Shifted Pulses from an Ytterbium Amplifier Open
In this work, we introduce a simplified approach to efficiently extend the high harmonic generation (HHG) cutoff in gases without the need for laser frequency conversion via parametric processes. Instead, we employ postcompression and red-…
View article: Ultrafast magnetic scattering on ferrimagnets enabled by a bright Yb-based soft x-ray source
Ultrafast magnetic scattering on ferrimagnets enabled by a bright Yb-based soft x-ray source Open
Development of ultrafast table-top x-ray sources that can map various spin, orbital, and electronic configurations and reordering processes on their natural time and length scales is an essential topic for modern condensed matter physics a…
View article: Programmable generation of terahertz bursts in chirped-pulse laser amplification
Programmable generation of terahertz bursts in chirped-pulse laser amplification Open
Amplified bursts of laser pulses are sought for various machining, deposition, spectroscopic, and strong-field applications. Standard frequency- and time-domain techniques for pulse division become inadequate when intraburst repetition rat…
View article: Extreme Raman red shift: ultrafast multimode nonlinear space-time dynamics, pulse compression, and broadly tunable frequency conversion
Extreme Raman red shift: ultrafast multimode nonlinear space-time dynamics, pulse compression, and broadly tunable frequency conversion Open
Ultrashort high-energy pulses at wavelengths longer than 1 µm are now desirable for a vast variety of applications in ultrafast and strong-field physics. To date, the main answer to the wavelength tunability for energetic, broadband pulses…
View article: Programmable Generation of Terahertz Bursts in Chirped-Pulse Laser\n Amplification
Programmable Generation of Terahertz Bursts in Chirped-Pulse Laser\n Amplification Open
Amplified bursts of laser pulses are sought for various machining,\ndeposition, spectroscopic and strong-field applications. Standard frequency-\nand time-domain techniques for pulse division become inadequate when intraburst\nrepetition r…
View article: Extreme Raman red shift: ultrafast multimode non-linear space-time dynamics, pulse compression, and broadly tunable frequency conversion
Extreme Raman red shift: ultrafast multimode non-linear space-time dynamics, pulse compression, and broadly tunable frequency conversion Open
Ultrashort high-energy pulses at wavelengths longer than 1 $μ$m are nowadays desired for a vast variety of applications in ultrafast and strong-field physics. To date, the main answer to the wavelength tunability for energetic, broadband p…
View article: Supplementary document for Extreme Raman red shift: ultrafast multimode non-linear space-time dynamics, pulse compression, and broadly tunable frequency conversion - 4782644.pdf
Supplementary document for Extreme Raman red shift: ultrafast multimode non-linear space-time dynamics, pulse compression, and broadly tunable frequency conversion - 4782644.pdf Open
supplementary material
View article: Programmable generation of terahertz bursts in chirped-pulse laser amplification
Programmable generation of terahertz bursts in chirped-pulse laser amplification Open
Amplified bursts of laser pulses are sought for various machining, deposition, spectroscopic, and strong-field applications. Standard frequency- and time-domain techniques for pulse division become inadequate when intraburst repetition rat…
View article: Time-resolving magnetic scattering on rare-earth ferrimagnets with a bright soft-X-ray high-harmonic source
Time-resolving magnetic scattering on rare-earth ferrimagnets with a bright soft-X-ray high-harmonic source Open
We demonstrate the first time-resolved X-ray resonant magnetic scattering (tr-XRMS) experiment at the N edge of Tb at 155 eV performed using a tabletop high-brightness high-harmonic generation (HHG) source. In contrast to static X-ray imag…
View article: Direct time-domain shaping of high-energy femtosecond pulses at THz burst frequencies
Direct time-domain shaping of high-energy femtosecond pulses at THz burst frequencies Open
We generate fully controllable fs multimillijoule pulse bursts with the energy handling, throughput efficiency and frequency resolution substantially exceeding that achievable in spatial-light-modulator and interferometric techniques. The …
View article: Generation of a single UV pulse from a near-IR pulse burst
Generation of a single UV pulse from a near-IR pulse burst Open
Summary form only given. High harmonic generation (HHG) requires high peak-power laser sources. Most of the well-known high peak power lasers are operating in the near-IR wavelength region. Recently it was demonstrated that HHG can be effe…
View article: High-energy pulse stacking via regenerative pulse-burst amplification
High-energy pulse stacking via regenerative pulse-burst amplification Open
Here we present a coherent pulse stacking approach for upscaling the energy of a solid-state femtosecond chirped pulse amplifier. We demonstrate pulse splitting into four replicas, amplification in a burst-mode regenerative Yb:CaF2 amplifi…
View article: 110-mJ 225-fs cryogenically cooled Yb:CaF_2 multipass amplifier
110-mJ 225-fs cryogenically cooled Yb:CaF_2 multipass amplifier Open
We report on a diode-pumped cryogenically cooled bulk Yb:CaF2 12-pass amplifier delivering 110-mJ, 1030-nm pulses at a 50-Hz repetition rate. The pulses have a spectral bandwidth of 13 nm and are compressed to 225 fs pulse duration in a do…