Generating high-contrast, near single-cycle waveforms with third-order dispersion compensation

Timmers, Henry; Kobayashi, Yuki; Chang, Kristina F.; Reduzzi, Maurizio; Neumark, Daniel M.; Leone, Stephen R.

doi:10.1364/ol.42.000811

Cited by 71 publications

(78 citation statements)

References 31 publications

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“…Therefore, these two pulses can be used together in a pump-probe experiment. We note that shorter pulse durations in the vis-NIR with similar pulse energy can be achieved with this method 38 , and could most likely be obtained here if the compression of the Ti:sa laser could be tuned independently for pumping the OPA stages and the vis-NIR HCF compressor.…”

Section: Simultaneous Production Of Few-cycle Visible-near Ir Pulsesmentioning

confidence: 83%

“…At the output, 0.8 mJ per pulse with a spectrum covering the 550-950 nm range ( Figure 3c) are obtained. Compression is achieved with reflections on sixteen ultra-broadband dispersive mirrors (PC1332, Ultrafast Innovations GmbH), transmission through fused silica wedges and finally through a 2-mm-thick Ammonium Dihydrogen Phosphate (ADP) crystal, which corrects for third-order dispersion 38 . The visible-near IR (vis-NIR) pulses are characterized with a d-scan module (Sphere Ultrafast Photonics) 39 , whose results are shown in Figure 3 retrieval algorithm indicates a pulse duration of 4.75 fs fwhm, which is 1.1 times the Fourier limit, with 75% of the intensity in the main pulse.…”

Section: Simultaneous Production Of Few-cycle Visible-near Ir Pulsesmentioning

confidence: 99%

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Efficient table-top dual-wavelength beamline for ultrafast transient absorption spectroscopy in the soft X-ray region

Barreau

Ross

Garg

et al. 2020

Sci Rep

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We present a table-top beamline providing a soft X-ray supercontinuum extending up to 350 eV from high-order harmonic generation with sub-13 fs 1300 nm driving pulses and simultaneous production of sub-5 fs pulses centered at 800 nm. Optimization of the high harmonic generation in a long and dense gas medium yields a photon flux of ~2 x 10 7 photons/s/1% bandwidth at 300 eV. The temporal resolution of X-ray transient absorption experiments with this beamline is measured to be 11 fs for 800 nm excitation. This dual-wavelength approach, combined with high flux and high spectral and temporal resolution soft X-ray absorption spectroscopy, is a new route to the study of ultrafast electronic dynamics in carbon-containing molecules and materials at the carbon K-edge. 2/10 Description of the table-top dual-wavelength beamlineThe beamline is summarized in Figure 1. It uses a 13 mJ , 800 nm, 30 fs, 1 kHz Ti:Sapphire laser (Coherent Legend Elite Duo), whose energy is split into 11 mJ +2 mJ to produce the probe and pump pulses, respectively, used in time-resolved X-ray transient absorption experiments. This section details the simultaneous compression of SWIR (centered at 1300 nm or 1400 nm) and visible-near infrared (centered at 800 nm) pulses, and the characteristics of the soft X-ray spectrometer. Production of few-cycle short-wave infrared pulsesThe few-cycle pulses centered at 1300 nm in the SWIR are produced using an OPA followed by spectral broadening in a hollow-core fiber filled with a rare gas 35 and compression with chirped mirrors 36 . The 11 mJ 800 nm beam is further split into 0.5 mJ and 10.5 mJ for use in a two-stage OPA, which converts the 800 nm to SWIR (1300 nm). The two-stage system is obtained from Light Conversion and is designed to provide CEP stability of the signal pulses. The first stage is a low energy OPA (TOPAS Prime), pumped by 0.5 mJ, which provides 90 J of 2 m pulses in the idler. Due to the parametric amplification process, the idler pulses are passively CEP stabilized, with a stability of <200 mrad. They are then used as the seed for the white light generation in a second, high energy, OPA (HE-TOPAS) pumped with the remaining 10.5 mJ of 800 nm light. This design should ensure the CEP stability of the signal pulses over the 1200-1600 nm tunable range of the OPA, regardless of the CEP stability of the pump laser. However, the following results are obtained with a CEP-averaged signal pulse. The 2.8 mJ, 1300 nm, 40 fs output is focused with a 2-m focusing mirror to a focal size of 390 m (at 1/e 2 ) at the entrance of a 3-m-long, 700-m-inner diameter stretched hollow-core fiber (HCF) filled with 0.4 bar of argon (Few-Cycle Inc.). The ratio of beam

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Section: Simultaneous Production Of Few-cycle Visible-near Ir Pulsesmentioning

confidence: 83%

Section: Simultaneous Production Of Few-cycle Visible-near Ir Pulsesmentioning

confidence: 99%

Efficient table-top dual-wavelength beamline for ultrafast transient absorption spectroscopy in the soft X-ray region

Barreau

Ross

Garg

et al. 2020

Sci Rep

Self Cite

View full text Add to dashboard Cite

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“…1: φ (1) ← rand(n) ⊲ initial guess phase 2: E (1) from fundamental spectrum 3: while criteria not met do 4: ComputeẼ sig (ω, z) (Equation 2) 5:Ẽ ′ sig (ω, z) ← amplitude from d-scan ⊲ data constraint 6: E ′ sig (t, z) from Fourier transform 7: while subcriteria not met do 8: Using NM, find φ ′′ that minimizes Z ⊲ physical constraint 9:Ẽ ′′ sig (ω, z) from inverse Fourier transform 10:…”

Section: Algorithm 2 Generalized Projection Algorithm For D-scanmentioning

confidence: 99%

“…Conceptually related methods include the sonogram method [3,4], multiphoton intrapulse interference phase scan (MIIPS, [5,6]), dispersion scan (d-scan, [7,8]), and chirp scan [9]. While the latter two related techniques are only a few years old, dispersion scan has recently proven a remarkable potential to accurately measure few-cycle pulses generated by compression of hollow-fiber supercontinua [10,11]. All these techniques effectively measure the dependence of the spectrum of a nonlinearly generated optical signal as a function of one particular parameter, e.g., the delay between two pulses in FROG.…”

Section: Introductionmentioning

confidence: 99%

Advanced phase retrieval for dispersion scan: a comparative study

et al. 2017

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Dispersion scan is a self-referenced measurement technique for ultrashort pulses. Similar to frequencyresolved optical gating, the dispersion scan technique records the dependence of nonlinearly generated spectra as a function of a parameter. For the two mentioned techniques, these parameters are the delay and the dispersion, respectively. While dispersion scan seems to offer a number of potential advantages over other characterization methods, in particular for measuring few-cycle pulses, retrieval of the spectral phase from the measured traces has so far mostly relied on the Nelder-Mead algorithm, which has a tendency of stagnation in a local minimum and may produce ghost satellites in the retrieval of pulses with complex spectra. We evaluate three different strategies to overcome these retrieval problems, namely regularization, use of a generalized-projections algorithm, and an evolutionary retrieval algorithm. While all these measures are found to improve the precision and convergence of dispersion scan retrieval, differential evolution is found to provide best performance, enabling the near-perfect retrieval of the phase of complex supercontinuum pulses within less than ten seconds, even in the presence of strong detection noise and limited phase-matching bandwidth of the nonlinear process.

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“…The ability to measure and quantify the achieved degree of compression is therefore paramount to identify the main characteristics of the output pulse and to further optimize its compression. Both spectral phase oscillations and the overall spectral phase of a pulse can be visualized in a very straightforward way using the dispersion-scan (d-scan) [41] technique, which has been extensively used in the last years to characterize many state-of-the-art few-cycle pulse sources around the world and is enabling new and very promising applications [6,[38][39][40]42]. D-scan is a recent approach for the simultaneous measurement and compression of femtosecond laser pulses.…”

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confidence: 99%

Universal route to optimal few- to single-cycle pulse generation in hollow-core fiber compressors

Jarque

Román

Silva

et al. 2018

Sci Rep

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Gas-filled hollow-core fiber (HCF) pulse post-compressors generating few- to single-cycle pulses are a key enabling tool for attosecond science and ultrafast spectroscopy. Achieving optimum performance in this regime can be extremely challenging due to the ultra-broad bandwidth of the pulses and the need of an adequate temporal diagnostic. These difficulties have hindered the full exploitation of HCF post-compressors, namely the generation of stable and high-quality near-Fourier-transform-limited pulses. Here we show that, independently of conditions such as the type of gas or the laser system used, there is a universal route to obtain the shortest stable output pulse down to the single-cycle regime. Numerical simulations and experimental measurements performed with the dispersion-scan technique reveal that, in quite general conditions, post-compressed pulses exhibit a residual third-order dispersion intrinsic to optimum nonlinear propagation within the fiber, in agreement with measurements independently performed in several laboratories around the world. The understanding of this effect and its adequate correction, e.g. using simple transparent optical media, enables achieving high-quality post-compressed pulses with only minor changes in existing setups. These optimized sources have impact in many fields of science and technology and should enable new and exciting applications in the few- to single-cycle pulse regime.

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Generating high-contrast, near single-cycle waveforms with third-order dispersion compensation

Cited by 71 publications

References 31 publications

Efficient table-top dual-wavelength beamline for ultrafast transient absorption spectroscopy in the soft X-ray region

Efficient table-top dual-wavelength beamline for ultrafast transient absorption spectroscopy in the soft X-ray region

Advanced phase retrieval for dispersion scan: a comparative study

Universal route to optimal few- to single-cycle pulse generation in hollow-core fiber compressors

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