Characterization of over-octave-spanning laser pulses using interferometric imaging of self-diffraction

Leithold, Christoph; Reislöhner, Jan; Aguillón, Jesús Delgado; Pfeiffer, Adrian N.

doi:10.1364/josab.35.001928

Cited by 5 publications

(8 citation statements)

References 28 publications

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“…This combines the advantage of rigour and speed of analytic retrieval, which is typical for SPIDER methods, with the reliability due to the feedback by a retrieved trace, which is typical for FROG methods. This combination of analytic retrieval and feedback is similar in interferometric imaging of self-diffraction [16,17], a recently introduced method for the characterization of VIS-IR pulses. A further and very important advantage of the characterization using XPM scans is that pulse energies on the picojoule-scale suffice, which makes the method especially useful for pulses in the DUV.…”

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confidence: 96%

“…In order to scrutinize aberrations of the retrieval, simulations are employed similar as described in Refs. [16,17,20] with a randomly generated waveform for A and R (Fig. 5).…”

mentioning

confidence: 99%

“…In Refs. [16,17] an analytic as well as an iterative retrieval method was introduced for this kind of traces. Here, the analytic method is applied.…”

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confidence: 99%

“…As detailed in Refs. [16,17], preliminary solutions Û (ω) and V (ω) are obtained by logarithmic differentiation with respect to ω respectively ω τ and subsequent exponential integration on the diagonal of the data trace. These are connected to the true solutions by U (ω) = Û (ω)e iα+iT ω+sω and V (ω) = V (ω)e iβ+iT ω+sω with the real integration constants α, β, T and s. The absolute arrival time T cannot be determined from the data traces, and also the determination of both carrier envelope phases α and β individually is impossible.…”

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confidence: 99%

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Characterization of weak deep ultraviolet pulses using cross-phase modulation scans

2019

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Temporal pulse characterization methods can often not be applied to UV pulses due to the lack of suitable nonlinear crystals and very low pulse energies. Here, a method is introduced for the characterization of two unknown and independent laser pulses. The applicability is broad, but the method is especially useful for pulses in the deep UV, because pulse energies on the picojoule-scale suffice. The basis is a spectral analysis of the two interfering UV pulses, while one of the pulses is phase shifted by an unknown VIS-IR pulse via cross-phase modulation. The pulse retrieval is analytic and the fidelity can be checked by comparing the complex-valued data trace with the retrieved trace.

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confidence: 96%

“…In order to scrutinize aberrations of the retrieval, simulations are employed similar as described in Refs. [16,17,20] with a randomly generated waveform for A and R (Fig. 5).…”

mentioning

confidence: 99%

“…In Refs. [16,17] an analytic as well as an iterative retrieval method was introduced for this kind of traces. Here, the analytic method is applied.…”

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confidence: 99%

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confidence: 99%

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Characterization of weak deep ultraviolet pulses using cross-phase modulation scans

2019

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“…In order to scrutinize the mechanism of harmonic concatenation, simulations are employed similar as described in Refs. [13,[16][17][18]. The unidirectional pulse propagation equation (UPPE) is integrated numerically using the split-step method.…”

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confidence: 99%

Harmonic Concatenation of 1.5-Femtosecond-Pulses in the Deep UV

Reislöhner

Leithold

Pfeiffer

2019

2019 Conference on Lasers and Electro-Optics Europe &Amp; European Quantum Electronics Conference (CLEO/Europe-EQEC)

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Laser pulses with a duration of one femtosecond or shorter can be generated both in the IR-VIS and in the extreme UV, but the deep UV is a spectral region where such extremely short pulses have not yet been demonstrated. Here, a method for the synthesis of ultrashort pulses in the deep UV is demonstrated, which utilizes the temporal and spatial harmonics that are generated by two noncollinear IR-VIS pulses in a thin MgF2 plate. By controlling the groove-envelope phase of the IR-VIS pulses, spatial harmonics are concatenated to form deep UV waveforms with a duration of 1.5 fs.Waveforms with durations short enough to probe the electronic timescale can be generated both in the extreme UV and in the IR-VIS region of the electromagnetic spectrum. High-order harmonic generation can be used to generate isolated attosecond pulses and pulse trains in the extreme UV [1], and since very recently the coherent synthesis of optical pulses is used to generate subcycle optical waveforms in the IR-VIS region [2]. In the deep UV (DUV), where many basic aromatic molecules absorb radiation and undergo photochemical reactions [3], pulses with such extremely short durations have not yet been demonstrated [4]. Exploiting nondegenerate frequency mixing in a hollow waveguide [5], in filamentation [6] or in a thin transparent solid [7], it has been possible to generate pulses with a duration on the order of 10 fs [5]. A similar pulse duration has been achieved by achromatic frequency doubling of visible ultrashort pulses [8]. Also self-compression of DUV pulses by filamentation has been demonstrated, yielding comparatively short pulses of ∼ 15 fs [9]. The shortest pulse duration reported to date of 2.8 fs has been achieved by frequency conversion in a gas cell [10], which, however, requires extremely short (< 4 fs) fundamental pulses in the IR-VIS.Despite these engagements of several groups in the development of pulse generation methods, spectroscopy with sub-10-fs DUV pulses has not often been reported to date. A fundamental difficulty is rooted in the large group velocity dispersion of any optical component in the DUV, causing a DUV pulse to be readily broadened and distorted before it reaches the sample. As a rare exception, it was recently demonstrated that ∼ 10-fs-DUV pulses, generated by chirped-pulse four-wave mixing [11], can be used in pump-probe spectroscopy of an aqueous solution of thymine [3].For applications like transient absorption spectroscopy, DUV pulses with durations shorter than currently available would be very useful. For example, in order to observe the transient change of band structures in dielectrics and the related screenings in the presence of a strong field pulse, probe pulses are required that i) have a duration shorter than the optical period of the strong field pulse, ii) encompass the wavelength of the dielectric bandgap, and iii) are available at the sample position.Here, a scheme for the coherent synthesis of DUV waveforms is presented. The principle is the concatenation of spatial and temporal harmonic...

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Harmonic Concatenation of 1.5 fs Pulses in the Deep Ultraviolet

2019

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Laser pulses with a duration of one femtosecond or shorter can be generated both in the visible-infrared (Vis-IR) and in the extreme UV, but the deep UV is a spectral region where such extremely short pulses have not yet been demonstrated. Here, a method for the synthesis of ultrashort pulses in the deep UV is demonstrated, which utilizes the temporal and spatial harmonics that are generated by two noncollinear Vis-IR pulses in a thin MgF2 plate. By controlling the groove-envelope phase of the Vis-IR pulses, spatial harmonics are concatenated to form deep UV waveforms with a duration of 1.5 fs.

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Characterization of over-octave-spanning laser pulses using interferometric imaging of self-diffraction

Cited by 5 publications

References 28 publications

Characterization of weak deep ultraviolet pulses using cross-phase modulation scans

Characterization of weak deep ultraviolet pulses using cross-phase modulation scans

Harmonic Concatenation of 1.5-Femtosecond-Pulses in the Deep UV

Harmonic Concatenation of 1.5 fs Pulses in the Deep Ultraviolet

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