Experimental and theoretical investigation of neonlike selenium x-ray laser spectral linewidths and their variation with amplification

Koch, J. A.; MacGowan, B. J.; Silva, Luiz Bueno da; Matthews, Dennis L; Underwood, J. H.; Batson, Phillip J.; Lee, Richard W.; London, Richard A.; Mrowka, S.

doi:10.1103/physreva.50.1877

Cited by 64 publications

(49 citation statements)

References 60 publications

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“…16 we estimate the linewidth of the 21st harmonic to be -0.1 A (FWHM) which is well below the resolving power of the spectrometer. Measurements of the linewidths of similar collisionally pumped neon-like x-ray lasers can be used to infer the line width of the similar Ga laser [92]. From this work we estimate that the linewidth of the Ga XXII, J=2-1 transition is -0.05 A.…”

Section: Wavelength (A)mentioning

confidence: 86%

Soft x-ray generation in gases with an ultrashort pulse laser

Ditmire¹

1996

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-p_-____p__ !&e Governnent reserves for itself and others acting on its behalf a rcrjalty free, nonexclusive, i r r e v d l e, wor ld-wide license for govermental purposes t o publish, distribute, translate, duplicate, exhibit, and perform any such data copyri&ted ky t h e aontractor. AcknowledgmentsThe work described in this thesis represents the results of collaborations with many people, all of whom I owe a great debt of gratitude. I have had a unique opportunity as a graduate student to work with some of the best scientists in the field and I have learned and benefited from all of them.First I want to thank Mike Perry. Mike has aided me through my graduate career in too many ways to summarize here. I have learned many things, both in science and otherwise, from Mike. Mike was a very strong supporter of me and my efforts from the earliest days in his group, and I immensely value his support, suggestions and complements. Mike is also to be lauded for supplying me with a world class atmosphere to do physics. He has gone beyond the call of duty in providing me with intellectual as well as physical resources that are unparalleled for most graduate students. In general, the studies of this manuscript fall into three categories. First, a unique 130 fs, 8 TW laser that is based on chirped pulse amplification, is described, and its performance is evaluated. In particular, a detailed analysis of flashlamp pumping large aperture (> 1 cm) LiSAF amplifiers is given. The effects of pulse propagation of laser pulses in chirped pulse amplifier lasers is also carelidly examined and modeled.The generation of x-rays through high order harmonics is then discussed with emphasis on characterizing and optimizing harmonic generation. These studies include V an examination of the wavelength range attainable with harmonics, the spatial profiles of the harmonics, the spectral linewidths of the harmonics, and the energy yields of the harmonics.

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Section: Wavelength (A)mentioning

confidence: 86%

Soft x-ray generation in gases with an ultrashort pulse laser

Ditmire¹

1996

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“…The spectral bandwidth of X-ray lasers is very narrow Koch et al, 1994!. The gain bandwidth due largely to thermal Doppler broadening arising from the temperature of the ions is typically such that n0Dn ; 20,000.…”

Section: X-ray Laser Propertiesmentioning

confidence: 99%

A review of X-ray laser development at Rutherford Appleton Laboratory

et al. 2002

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Recent experiments undertaken at the Rutherford Appleton Laboratory to produce X-ray lasing over the 5-30 nm wavelength range are reviewed. The efficiency of lasing is optimized when the main pumping pulse interacts with a preformed plasma. Experiments using double 75-ps pulses and picosecond pulses superimposed on 300-ps background pulses are described. The use of travelling wave pumping with the approximately picosecond pulse experiments is necessary as the gain duration becomes comparable to the time for the X-ray laser pulse to propagate along the target length. Results from a model taking account of laser saturation and deviations from the speed of light c of the travelling wave and X-ray laser group velocity are presented. We show that X-ray laser pulses as short as 2-3 ps can be produced with optical pumping pulses of '1-ps.

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“…In order to define strategies to progress towards this goal, one needs to better characterize the respective contribution of the different broadening mechanisms that prevail in XUV laser plasmas. The intrinsic spectral profile of emission lines in a plasma is determined predominantly by spontaneous emission rates, electron collisional rates, Stark broadening and Doppler broadening [9] with possible complications due to ion turbulence [10] and additional ion-ion interactions [10,11,12,13]. In a medium with population inversions and gain, the observed profile is modified by radiative transport effects in being narrowed approximatively as the square root of the gain-length product in the small signal regime [8].…”

Section: Introductionmentioning

confidence: 99%

Line profiles of Ni-like collisional XUV laser amplifiers: Particle correlation effects

Calisti

Ferri

Mossé

et al. 2013

High Energy Density Physics

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We present a detailed analysis of the different processes that contribute to the spectral broadening of the Ni-like Ag XUV laser line, including the effects of particle correlations on the broadening due to the radiator motion (Doppler broadening). We consider two different regimes of collisional excitation pumping: the transient pumping for which ionic temperature is relatively low (the plasma coupling parameter is large), and the quasi steady-state pumping for which the ionic temperature is higher and the plasma coupling parameter is of the order of 1. In both cases, by using classical molecular dynamics simulation techniques, we show that ionic correlations actually modify the radiatormotion broadened profiles and cannot be neglected in evaluating the Doppler effect. The subsequent narrowing of the Doppler component is small compared to the overall linewidth, which includes the effect of homogeneous collisional broadening. However ionic correlations will also affect the amplification of the lasing line, especially when the laser enters the saturation regime, because it will lead to an homogenization of the spectral profile.

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Experimental and theoretical investigation of neonlike selenium x-ray laser spectral linewidths and their variation with amplification

Cited by 64 publications

References 60 publications

Soft x-ray generation in gases with an ultrashort pulse laser

Soft x-ray generation in gases with an ultrashort pulse laser

A review of X-ray laser development at Rutherford Appleton Laboratory

Line profiles of Ni-like collisional XUV laser amplifiers: Particle correlation effects

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