High-repetition-rate hard X-ray generation with sub-millijoule femtosecond laser pulses

Hagedorn, M.; Kutzner, J.; Tsilimis, G.; Zacharias, H.

doi:10.1007/s00340-003-1226-3

Cited by 48 publications

(30 citation statements)

References 40 publications

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“…X rays can be generated with such low-energy, ultrashort pulses. 18 Especially, with the presented tape target high conversion efficiencies are obtained with comparatively low pulse energies and low intensities in the 10 15 W/cm 2 range.…”

Section: Introductionmentioning

confidence: 93%

Laser‐based, high repetition rate, ultrafast X‐ray source

Kutzner

Witte

Silies

et al. 2006

Surface & Interface Analysis

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A compact, ultrashort, laser-based hard X-ray source particularly suited for high repetition rate laser systems (≥1 kHz) is presented. X rays in the keV energy range are generated efficiently with 30 fs laser pulses on different tape targets containing chromium and iron. Spectroscopic investigations showed that for the chromium as well as for the iron tapes, strong Ka and Kb emission were observed in addition to a weak bremsstrahlung continuum. These tape targets are especially suited for applications in a transmission geometry, which provides significant advantages. The operation of the tape target was studied with repetition rates up to 10 kHz. With input pulses of 0.5 mJ and modest intensities in the low 10 15 W/cm 2 range, X-ray Ka photon fluxes exceeding 6 × 10 9 photons/s were achieved, yielding conversion efficiencies of h Ka > 10 −6 . With a toroidally bent crystal the generated radiation was monochromatized and focused to a 85-µm diameter spot demonstrating the ability of the source to act as a X-ray point source, a pre-requisite for an application in X-ray microscopy.

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Section: Introductionmentioning

confidence: 93%

Laser‐based, high repetition rate, ultrafast X‐ray source

Kutzner

Witte

Silies

et al. 2006

Surface & Interface Analysis

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“…The conversion efficiency obtained by other groups using high repetition millijoule or submillijoule laser has been reported to be about 4.6 × 10 -6 -3.2 ×10 -5 . [12][13][14] in vacuum conditions and ~5.0 × 10 -6 in helium atmospheric conditions. The Kα X-ray intensity obtained in helium at atmospheric pressure was also of the same order as the other works using high repetition millijoule or submillijoule laser in vacuum conditions.…”

Section: Wμmmentioning

confidence: 99%

“…[12][13][14] Although the experimental scale of a femtosecond laser could be successfully reduced with a tabletop femtosecond laser, difficulties remain when using Table 1: General comparison of the laser-induced plasma X-ray with low-power femtosecond laser with X-ray from synchrotron and high-power femtosecond laser.…”

Section: Introductionmentioning

confidence: 99%

Development of femtosecond X-ray source in helium atmosphere with millijoule high-repetition-rate femtosecond laser

Hada

Matsuo

2009

Trans. Mat. Res. Soc. Japan

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High intensity Cu Kα X-ray was generated in helium at atmospheric pressure (760 torr) using a commercial millijoule high-repetition rate Ti: sapphire laser. The characteristic Kα X-ray was generated by focusing the 0.06 mJ-1.46 mJ, 100 fs and 1 kHz repetition femtosecond laser onto a solid Cu target to a spot with a 5 μm diameter. We obtained the characteristic Kα X-ray of 5.4 × 10 9 photos/s into 2π sr at a 1 kHz repetition rate with 5.0 × 10 -6 conversion efficiency. Kα X-ray intensity can be enhanced with 4-8% prepulse plasma into 7.7 × 10 9 photos/s/sr with 6.8 × 10 -6 conversion efficiency. The X-ray intensity and conversion efficiency in helium achieved the almost the same level as in vacuum. Such vacuum-free femtosecond X-ray source with a tabletop laser can be a promising and easy accessible tool for time-resolved X-ray diffraction and other radiographic applications. The time-resolved X-ray diffraction experiment would reveal the ultrafast dynamics in crystalline materials, such as coherent phonon vibrations and ultrafast phase transitions.

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“…On the other hand, a low energy laser based source can be more durable, operate at high repetition rate, and generate a lower continuum emission due to less heating of bulk high density plasma. 4 However, they typically do not exhibit as good an x-ray conversion efficiency [15][16][17][18][19] as Cu K␣ conversion efficiency scaling with laser energy approximately to the 1.5 power in this intensity range. 4 Recently, we have demonstrated a kilohertz Cu K␣ source produced by submillijoule laser pulses 20 where the x-ray conversion to Cu K␣ x-ray emission was comparable to that using multimillijoule laser pulses.…”

mentioning

confidence: 97%

“…With the availability of kilohertz femtosecond laser systems, a high repetition rate x-ray source can be realized. 3,[15][16][17][18][19][20] Many studies have been reported on phase contrast imaging using femtosecond laser based x-ray sources. 1-5 All these studies have been carried out using laser systems having relatively large laser pulse energy ranging from a few tens of millijoules to hundreds of millijoules on target.…”

mentioning

confidence: 99%

A continuous kilohertz Cu Kα source produced by submillijoule femtosecond laser pulses for phase contrast imaging

Chakera

Ali

Tsui

et al. 2008

Applied Physics Letters

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We report a continuously operated Cu Kα x-ray source produced by a commercial kilohertz submillijoule femtosecond laser system. The source has an x-ray conversion of ∼4×10−5 into Kα line emission at 8.05 keV. The microplasma x-ray source has a size of 8 μm (full width at half maximum) produced by focusing 260 μJ laser pulses on a moving Cu-wire target. An average photon flux of ∼1.1×109 photons/sr/s is obtained using the above laser pulses. The source has been used to record phase contrast images of test samples. This compact x-ray source can serve as a low cost operating system for phase contrast imaging in clinical applications.

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High-repetition-rate hard X-ray generation with sub-millijoule femtosecond laser pulses

Cited by 48 publications

References 40 publications

Laser‐based, high repetition rate, ultrafast X‐ray source

Laser‐based, high repetition rate, ultrafast X‐ray source

Development of femtosecond X-ray source in helium atmosphere with millijoule high-repetition-rate femtosecond laser

A continuous kilohertz Cu Kα source produced by submillijoule femtosecond laser pulses for phase contrast imaging

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