Generation of submicrojoule high harmonics using a long gas jet in a two-color laser field

Kim, I Jong; Lee, Gae Hwang; Park, Seung Beom; Lee, Yong Soo; Kim, Tae Keun; Nam, Chang Hee; Mocek, Tomáš; Jakubczak, Krzysztof

doi:10.1063/1.2836252

Cited by 108 publications

(54 citation statements)

References 16 publications

(14 reference statements)

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“…This effect not only decreases the cutoff photon energy but also shortens the interaction length for HHG. Although many HHG works have emphasized the importance of plasma defocusing and attributed many experimental phenomena to it [12][13][14][15][16], a quantitative discussion about the influence of plasma defocusing in HHG efficiency is missing.…”

Section: Introductionmentioning

confidence: 99%

The influence of plasma defocusing in high harmonic generation

Lai¹,

Kärtner²

2011

Opt. Express

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Abstract:We numerically investigate the influence of plasma defocusing in high harmonic generation (HHG) by solving the first-order wave equation in an ionized medium and defining an enhancement factor to quantitatively analyze the influence of plasma defocusing. While degrading the driver pulse intensity, plasma also has a strong impact on HHG phase-matching. Combined with the HHG wavelength scaling law, our results give an estimate of HHG efficiencies with different driver wavelengths and show a limited HHG efficiency in high density media. ©2011 Optical Society of America

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Section: Introductionmentioning

confidence: 99%

The influence of plasma defocusing in high harmonic generation

Lai¹,

Kärtner²

2011

Opt. Express

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“…This scheme, involving only a frequency doubling crystal, was extensively investigated over the past years. In particular, it was established that harmonic pulses, containing both odd and even orders, can be generated with improved efficiency [22][23][24][25][26] compared with single-colour harmonic generation. The polarization of the harmonics, generated in such a specific case of orthogonally polarized o and 2o laser fields in a centrally symmetric gas medium, was not measured so far and was expected to be linear 27 .…”

mentioning

confidence: 99%

Towards enabling femtosecond helicity-dependent spectroscopy with high-harmonic sources

et al. 2015

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Recent advances in high-harmonic generation gave rise to soft X-ray pulses with higher intensity, shorter duration and higher photon energy. One of the remaining shortages of this source is its restriction to linear polarization, since the yield of generation of elliptically polarized high harmonics has been low so far. We here show how this limitation is overcome by using a cross-polarized two-colour laser field. With this simple technique, we reach high degrees of ellipticity (up to 75%) with efficiencies similar to classically generated linearly polarized harmonics. To demonstrate these features and to prove the capacity of our source for applications, we measure the X-ray magnetic circular dichroism (XMCD) effect of nickel at the M 2,3 absorption edge around 67 eV. There results open up the way towards femtosecond time-resolved experiments using high harmonics exploiting the powerful element-sensitive XMCD effect and resolving the ultrafast magnetization dynamics of individual components in complex materials.

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“…Over recent years there has been substantial progress in optimizing the output of high-harmonic generation by high-energy laser systems. This resulted in μJ pulse energy in a single harmonic spectral peak with an average power >100 μW [20,21]. However, for spectroscopic purposes a high average power in combination with a higher repetition rate is required rather than high pulse energy.…”

Section: High-harmonic Generation and Requirements On Driving Laser Smentioning

confidence: 99%

Ultrafast fiber lasers for strong‐field physics experiments

Limpert

Hädrich

Rothhardt

et al. 2011

Laser & Photonics Reviews

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The recent demonstration of rare-earth-doped fiber lasers with a continuous-wave output power approaching the 10-kW level with diffraction-limited beam quality proves that fiber lasers constitute a scalable solid-state laser concept in terms of average power. In order to generate high peak power pulses from a fiber several fundamental limitations have to be overcome. This can be achieved by novel experimental strategies and fiber designs that offer an enormous potential towards ultrafast laser systems combining high average powers (> kW) and high peak power (> GW). In this paper the challenges, achievements and perspectives of ultrashort pulse generation and amplification in fibers are reviewed. This kind of laser system will have a tremendous impact on strong-field physics experiments, such as the generation of coherent light by high-harmonic generation. So far, applications in the interesting EUV spectral range suffer from the very low photon count leading to nonrelevant integration times with highly sophisticated detection schemes. High repetition rate high average power fiber lasers can potentially solve this issue. First demonstrations of high repetition-rate strong-field physics experiments using novel fiber laser systems will be discussed

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Generation of submicrojoule high harmonics using a long gas jet in a two-color laser field

Cited by 108 publications

References 16 publications

The influence of plasma defocusing in high harmonic generation

The influence of plasma defocusing in high harmonic generation

Towards enabling femtosecond helicity-dependent spectroscopy with high-harmonic sources

Ultrafast fiber lasers for strong‐field physics experiments

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