Spectral phase sensitivity of frequency resolved optical switching for broadband IR pulse characterization

Longa, Adrien; Kumar, Mayank; Lassonde, Philippe; Ibrahim, Heide; Légaré, François; Leblanc, Adrien

doi:10.1364/oe.451522

Cited by 6 publications

(1 citation statement)

References 36 publications

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“…Frequency-resolved optical switching (FROSt) is the technique used to temporally characterize the signal and the idler after the last stage of amplification (OPA3) and the DFG pulses [25,26].…”

Section: Duration Measurementmentioning

confidence: 99%

Time-resolved ARPES with probe energy of 6.0 eV and tunable MIR pump at 250 kHz

Longa,

Parent,

frimpong

et al. 2024

Preprint

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In this paper, we present a laser source designed specifically for time- and angle-resolved photoemission (TR-ARPES) investigations of light-induced electron dynamics in quantum materials. Our laser source is based on an ytterbium-doped laser that seeds an optical parametric amplifier (OPA) followed by a difference frequency generation (DFG) stage. This configuration enables the generation of tunable near-infrared and mid-infrared laser pulses (1.5 to 8 μm - 0.82 to 0.15 eV) at 250 kHz of repetition rate, serving as the pump for TR-ARPES measurements. The remaining energy of the laser is used to generate the ultraviolet 6 eV probe pulses, which prompt the material to emit photoelectrons. We demonstrate the long-term stability of the source, as well as the characterization of the beam profiles and pulse durations. Additionally, we present preliminary TR-ARPES results obtained on Bi₂Te₃, a prototypical 3D topological insulator. This paper illustrates the capability of our laser source to probe electronic dynamics in quantum materials.

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Section: Duration Measurementmentioning

confidence: 99%

Time-resolved ARPES with probe energy of 6.0 eV and tunable MIR pump at 250 kHz

Longa,

Parent,

frimpong

et al. 2024

Preprint

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Temporal Characterization of Laser Pulses Using an Air‐Based Knife‐Edge Technique

Béjot,

Kumar Bhalavi,

Leblanc

et al. 2024

Advanced Photonics Research

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The characterization of ultrashort laser pulses is presented by using the plasma‐induced frequency‐resolved optical switching technique, implemented in ambient air. The recently developed method allows for a temporal reconstruction of a pulse at its focal spot by utilizing a moderately intense pump laser pulse for generating a ionization‐induced ultrafast defocusing lens. When propagating through the produced plasma lens, the probe beam to characterize experiences an increase of its size in the far field. The spectrum of the defocused probe field, measured as a function of the pump‐probe delay, allows for a comprehensive characterization of the temporal and spectral attributes of the pulse. Herein, the ability of this technique, initially designed for use in rare gases, is reported to operate in ambient air conditions with similar performance. The method is remarkably straightforward to implement and requires no additional optical component other than a focusing mirror while delivering laser pulse reconstructions of high reliability.

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Characterizing ultrashort pulses with photon energies above 1.12 eV based on transient absorption in silicon thin films

Kumar,

Mokhtari,

Guay

et al. 2024

J. Phys. Photonics

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Frequency-resolved optical switching (FROSt) is a phase-matching-free characterization technique for ultrashort pulses based on transient absorption in semiconductors. So far, this technique has been limited to characterizing pulses with photon energies smaller than the bandgap of the semiconductors used. In this work, we extend the method to characterize pulses of photon energy greater than the bandgap of the semiconductor used for characterization. We demonstrate this by characterizing ultrashort visible pulses and supercontinuum (SC) using silicon (Si) thin films deposited on a sapphire substrate. We also demonstrate that visible light sources up to a repetition rate of 250 kHz can be characterized using these samples. Therefore, this study highlights the potential of FROSt as a suitable technique for the temporal characterization of weak visible to infrared (IR) pulses, including high harmonics generated in solids.

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Spectral phase sensitivity of frequency resolved optical switching for broadband IR pulse characterization

Cited by 6 publications

References 36 publications

Time-resolved ARPES with probe energy of 6.0 eV and tunable MIR pump at 250 kHz

Time-resolved ARPES with probe energy of 6.0 eV and tunable MIR pump at 250 kHz

Temporal Characterization of Laser Pulses Using an Air‐Based Knife‐Edge Technique

Characterizing ultrashort pulses with photon energies above 1.12 eV based on transient absorption in silicon thin films

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