Generation of highly coherent submicrojoule soft x rays by high-order harmonics

Takahashi, Eiji J.; Nabekawa, Yasuo; Otsuka, T.; Obara, Minoru; Midorikawa, Katsumi

doi:10.1103/physreva.66.021802

Cited by 222 publications

(123 citation statements)

References 17 publications

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“…The repetition rate of these pulses is determined by the repetition rate of the Ti:Sapphire laser, and is of the order of 1 kHz. EUV pulses with pulse energy approaching 1 lJ have also been demonstrated, but at a much lower repetition rate [13].…”

Section: Introductionmentioning

confidence: 99%

Performance study of a soft X-ray harmonic generation FEL seeded with an EUV laser pulse

Gullans

Wurtele

Penn

et al. 2007

Optics Communications

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The performance of a free electron laser (FEL) using a low-power extreme ultraviolet (EUV) pulse as an input seed is investigated. The parameters are appropriate for 30 nm seeds produced from high-power Ti:Sapphire pulses using high harmonic generation schemes. It is found that, for reasonable beam parameters, robust FEL performance can be obtained. Both time-independent and time-dependent simulations are performed for varying system parameters using the GENESIS simulation code. A comparison is made with a two-stage harmonic FEL that is seeded by a high-power Ti:Sapphire pulse.

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Section: Introductionmentioning

confidence: 99%

Performance study of a soft X-ray harmonic generation FEL seeded with an EUV laser pulse

Gullans

Wurtele

Penn

et al. 2007

Optics Communications

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“…Therefore, the following modifications of the laser system are required: (i) the compressor must be placed in a vacuum chamber to eliminate the nonlinear effect caused by air or an input glass window for an HOH generation chamber. (ii) A beam line for a loosely focused geometry [19,20,23] using a concave mirror should also be put in a vacuum chamber.…”

Section: Prospectsmentioning

confidence: 99%

“…In fact, the pulse energy and intensity of the APT or one harmonic pulse now reached more than µJ [19,20] and 10 12 -10 14 W/cm 2 [21,22], respectively, on the basis of the energy scaling criteria of HOH generation under the phase matching condition [23].…”

mentioning

confidence: 99%

Multi-terawatt laser system generating 12-fs pulses at 100 Hz repetition rate

et al. 2010

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We have developed a laser system generating high peak-power ultrashort pulses based on the chirped pulse amplification of a Ti:sapphire laser. The pulse duration of the laser is reduced to 12 fs, owing to the successful compensation of gain narrowing during amplification with novel optics. The pulse energy and the repetition rate are 40 mJ and 100 Hz, respectively, as a consequence of sufficient energy extraction from a laser medium in the final stage of a multipass amplifier chain, which is designed to balance focusing with a thermal lens against defocusing with convex mirrors without cryogenic cooling for Ti:sapphire crystals. The laser pulses delivered from this laser system are suitable for generating an intense attosecond pulse train in a vacuum ultraviolet or extreme ultraviolet region.

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“…Thus it is desirable to search for the scaling rule of high harmonics generated in a guided geometry [42][43][44]. So far the scaling of macroscopic parameters has been studied for one-color laser pulses in the free geometry only [14,[26][27][28]30]. Whether or not such scaling will work for multicolor laser pulses in a hollow waveguide has not been examined yet.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, the rapid decrease of harmonic yield at longer wavelength can be compensated by adjusting the macroscopic conditions, for example, by increasing the gas pressure [24,25]. Midorikawa's group investigated the power scaling of HHG using a self-guided beam in 2002 [26]. However, their designed scaling was not achieved due to the limitation in pulse energy.…”

Section: Introductionmentioning

confidence: 99%

Macroscopic scaling of high-order harmonics generated by two-color optimized waveforms in a hollow waveguide

2017

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We present the macroscopic scaling of high harmonics generated by two-color laser pulses interacting with Ne gas in a hollow waveguide. We demonstrate that the divergence of harmonics is inversely proportional to the waveguide radius and harmonic yields are proportional to the square of the waveguide radius when the gas pressure and waveguide length are chosen to meet the phase-matching condition. We also show that harmonic yields are inversely proportional to the ionization level of the optimized two-color waveform with proper gas pressure if waveguide radius and length are fixed. These scaling relations would help experimentalists find phase-matching conditions to efficiently generate tabletop high-flux coherent soft x rays for applications.

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Generation of highly coherent submicrojoule soft x rays by high-order harmonics

Cited by 222 publications

References 17 publications

Performance study of a soft X-ray harmonic generation FEL seeded with an EUV laser pulse

Performance study of a soft X-ray harmonic generation FEL seeded with an EUV laser pulse

Multi-terawatt laser system generating 12-fs pulses at 100 Hz repetition rate

Macroscopic scaling of high-order harmonics generated by two-color optimized waveforms in a hollow waveguide

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