Proposal of an operation mode of FELiChEM for generating high-power ultra-short infrared FEL pulses

Zhao, Zhouyu; Li, Heting; Jia, Qika; He, Zhigang; Zhu, Yunpeng

doi:10.1016/j.nima.2020.164634

Cited by 3 publications

(5 citation statements)

References 26 publications

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“…However, this limitation impedes the monitoring of the charge trapping to exhibit characteristic absorption in the far-infrared region. In this regard, infrared free electron laser (IRFEL), featuring high brightness in midfar infrared region and femtosecond pulse, can be the promising candidate to replace the table-based infrared light source in the fs-TAS (Figure a). Picosecond IRFEL pump–probe experiments have already successfully explored the vibrational relaxation of CO molecules bound to the conformational substates of myoglobin .…”

Section: Discussionmentioning

confidence: 99%

Charge Trapping in Semiconductor Photocatalysts: A Time- and Space-Domain Perspective

Xue,

Fujitsuka,

Tachikawa

et al. 2024

J. Am. Chem. Soc.

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Harnessing solar energy to produce value-added fuels and chemicals through photocatalysis techniques holds promise for establishing a sustainable and environmentally friendly energy economy. The intricate dynamics of photogenerated charge carriers lies at the core of the photocatalysis. The balance between charge trapping and band-edge recombination has a crucial influence on the activity of semiconductor photocatalysts. Consequently, the regulation of traps in photocatalysts becomes the key to optimizing their activities. Nevertheless, our comprehension of charge trapping, compared to that of well-studied charge recombination, remains somewhat limited. This limitation stems from the inherently heterogeneous nature of traps at both temporal and spatial scales, which renders the characterization of charge trapping a formidable challenge. Fortunately, recent advancements in both time-resolved spectroscopy and space-resolved microscopy have paved the way for considerable progress in the investigation and manipulation of charge trapping. In this Perspective, we focus on charge trapping in photocatalysts with the aim of establishing a direct link to their photocatalytic activities. To achieve this, we begin by elucidating the principles of advanced time-resolved spectroscopic techniques such as femtosecond time-resolved transient absorption spectroscopy and space-resolved microscopic methods, such as single-molecule fluorescence microscopy and surface photovoltage microscopy. Additionally, we provide an overview of noteworthy research endeavors dedicated to probing charge trapping using time- and space-resolved techniques. Our attention is then directed toward recent achievements in the manipulation of charge trapping in photocatalysts through defect engineering. Finally, we summarize this Perspective and discuss the future challenges and opportunities that lie ahead in the field.

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Section: Discussionmentioning

confidence: 99%

Charge Trapping in Semiconductor Photocatalysts: A Time- and Space-Domain Perspective

Xue,

Fujitsuka,

Tachikawa

et al. 2024

J. Am. Chem. Soc.

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“…The development of both low-gain/high-Q and high-gain/low-Q oscillators is an active and ongoing area of research into FEL sources over virtually the entire electromagnetic spectrum [30,86,91,92,241,[244][245][246][247][248]. Both types of FEL oscillators have their own merits.…”

Section: Discussionmentioning

confidence: 99%

“…Copyright Springer, 2018. The unique properties of FEL oscillators, in particular to fill the spectral gap for coherent light sources in the visible to microwave spectral range, resulted quickly in the establishment of several facilities for applied research. The characteristics of user facilities using FEL oscillators depends, in part, on the accelerator technology used, which includes electrostatic acceleration [6][7][8][9], energy recovery linear accelerators (linacs) [10][11][12][13][14][15], nonrecovery linacs [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30], microtrons [31,32] and synchrotrons [33][34][35][36][37]. Research performed at these user facilities includes, amongst others, biological and material science [38].…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional, Time-Dependent Analysis of High- and Low-Q Free-Electron Laser Oscillators

Slot

Freund

2021

Applied Sciences

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Free-electron lasers (FELs) have been designed to operate over virtually the entire electromagnetic spectrum, from microwaves through to X-rays, and in a variety of configurations, including amplifiers and oscillators. Oscillators can operate in both the low and high gain regime and are typically used to improve the spatial and temporal coherence of the light generated. We will discuss various FEL oscillators, ranging from systems with high-quality resonators combined with low-gain undulators, to systems with a low-quality resonator combined with a high-gain undulator line. The FEL gain code MINERVA and wavefront propagation code OPC are used to model the FEL interaction within the undulator and the propagation in the remainder of the oscillator, respectively. We will not only include experimental data for the various systems for comparison when available, but also present, for selected cases, how the two codes can be used to study the effect of mirror aberrations and thermal mirror deformation on FEL performance.

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“…Development of both low-gain/high-𝑄 and high-gain/low-𝑄 oscillators is an active and ongoing area of research into FEL sources over virtually the entire electromagnetic spectrum [29,85,90,91,227,[230][231][232][233][234]. Both types of FEL oscillators have their own merits.…”

Section: Discussionmentioning

confidence: 99%

“…facilities for applied research. The characteristics of user facilities using FEL oscillators depends in part on the accelerator technology used, which include electrostatic acceleration [5][6][7][8], energy recovery linear accelerators (linacs) [9][10][11][12][13][14], non-recovery linacs [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29], microtrons [30,31] and synchrotrons [32][33][34][35][36]. Research performed at these user facilities includes amongst others biological and material science [37].…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional, time-dependent analysis of high- and low-Q free-electron laser oscillators

Slot¹,

Freund²

2021

Preprint

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Free-electron lasers (FELs) have been designed to operate over virtually the entire electromagnetic spectrum from microwaves through x-rays and in a variety of configurations including amplifiers and oscillators. Oscillators can operate in both the low and high gain regime and are typically used to improve the spatial and temporal coherence of the light generated. We will discuss various FEL oscillators ranging from systems with high-quality resonators combined with low-gain undulators to systems with a low-quality resonator combined with a high-gain undulator line. The FEL gain code MINERVA and wavefront propagation code OPC are used to model the FEL interaction within the undulator and the propagation in the remainder of the oscillator, respectively. We will not only include experimental data for the various systems for comparison when available, but also present for selected cases how the two codes can be used to study the effect of mirror aberrations and thermal mirror deformation on FEL performance.

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Proposal of an operation mode of FELiChEM for generating high-power ultra-short infrared FEL pulses

Cited by 3 publications

References 26 publications

Charge Trapping in Semiconductor Photocatalysts: A Time- and Space-Domain Perspective

Charge Trapping in Semiconductor Photocatalysts: A Time- and Space-Domain Perspective

Three-Dimensional, Time-Dependent Analysis of High- and Low-Q Free-Electron Laser Oscillators

Three-dimensional, time-dependent analysis of high- and low-Q free-electron laser oscillators

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