Demonstration of X-Ray Amplification in Transient Gain Nickel-like Palladium Scheme

Dunn, James P.; Osterheld, A. L.; Shepherd, R.; White, William E.; Shlyaptsev, Vyacheslav N.; Stewart, R. E.

doi:10.1103/physrevlett.80.2825

Cited by 173 publications

(86 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This establishes that the main reason for the rollover in the output for the data taken without the traveling wave is related to the finite transient gain lifetime in the plasma column and not due to refraction effects. 5 Applying the Linford equation to the traveling wave data points indicates that the gain is as high as 65 cm -1 , as shown by the solid line through data points for 0.2 to 0.3 cm. 11 The second interesting feature relates to the observed trend in the x-ray laser output when the long pulse energy is set between approximately 0.7 and 2.2 J.…”

Section: Resultsmentioning

confidence: 99%

“…Previously, strong lasing, gain of 35 cm -1 and a gain length product of 12.5, was observed under slightly different laser irradiation conditions. 5 However, the x-ray laser was not reported to be in the saturation regime largely because of the finite transient gain lifetime and no traveling wave excitation geometry. Fig.…”

Section: Resultsmentioning

confidence: 99%

“…7 Several changes in the experimental conditions were introduced in comparison with our previous x-ray laser campaigns. 5,9 First, the long pulse was defocused to a width of approximately 150 µm (FWHM) while the short pulse beam was focused to 80 µm. The main idea was to produce a more uniform lateral plasma medium prior to the excitation process driven by the picosecond laser.…”

Section: °mentioning

confidence: 99%

“…4 This has been extended to the Ni-like ion sequence for the Pd 4d→4p line at 146.8 Å. 5 Gain saturation was first reported on the Ne-like transient scheme for Ti at 326 Å and Ge at 196 Å using the larger Vulcan-CPA laser at the Rutherford Appleton Laboratory. 6 However, the laser drive energy to achieve this saturation was reported to be a total of 32 J and 60 J, respectively for Ti and Ge, which is currently beyond the output of present table-top lasers.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Tabletop transient collisional excitation x-ray lasers

Dunn

Osterheld

et al. 1999

SPIE Proceedings

View full text Add to dashboard Cite

Recent transient collisional excitation x-ray laser experiments are reported using the COMET tabletop laser driver at the Lawrence Livermore National Laboratory (LLNL). Ne-like and Ni-like ion x-ray laser schemes have been investigated with a combination of long 600 ps and short ~1 ps high power laser pulses with 5 -10 J total energy. We show small signal gain saturation for x-ray lasers when a reflection echelon traveling wave geometry is utilized. A gain length product of 18 has been achieved for the Ni-like Pd 4d→4p J=0-1 line at 147 Å, with an estimated output of ~10µJ. Strong lasing on the 119 Å Ni-like Sn line has also been observed. To our knowledge this is the first time gain saturation has been achieved on a tabletop laser driven scheme and is the shortest wavelength tabletop x-ray laser demonstrated to date. In addition, we present preliminary results of the characterization of the line focus uniformity for a Ne-like ion scheme using L-shell spectroscopy.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: °mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Tabletop transient collisional excitation x-ray lasers

Dunn

Osterheld

et al. 1999

SPIE Proceedings

View full text Add to dashboard Cite

show abstract

“…Lasing may also be present in Ni-like [12,13] or Kr-like [14,15] ions in higher-Z wire array plasmas, such as tungsten. It would be worthwhile to field an on-axis spectrometer to look for amplified soft x-ray lines on Z as a ride-along diagnostic.…”

mentioning

confidence: 99%

Analysis of radially resolved spectra and potential for lasing in Mo wire array Z pinches

et al. 2005

View full text Add to dashboard Cite

Measurements of radially resolved L-shell Mo spectra from wire array pinches on Sandia's 20 MA, 100 NS Z generator [Phys. Plasmas 5, 2105 (1998)] are presented and analyzed using a collisional-radiative model. The spectra indicate large radial gradients in density over the ∼8-mm-diameter plasma column, but only the emission from the ∼2mm central region of the pinch appears to be influenced by opacity. Population inversions and significant gain factors for 100–200Å transitions in Ne-like Mo are predicted to exist at the diagnosed plasma conditions.

show abstract

Lasers, ExtremeUVand SoftX‐ray

Nilsen

2004

Digital Encyclopedia of Applied Physics

View full text Add to dashboard Cite

Two decades ago, very large sources such as the building size ICF lasers were used as the energy sources to drive the first X‐ray lasers. Tremendous progress has been made over the last two decades to produce tabletop, high‐repetition rate X‐ray lasers that can be used as tools for applications. With the use of high‐reflectivity multilayer mirrors, many of the standard optical techniques such as interferometry can be extended to the soft X‐ray regime between wavelengths of 10 and 50 nm. The dominant X‐ray laser schemes are the monopole collisional excitation lasers either driven by chirped pulse amplification (CPA) laser systems or capillary discharge. The CPA systems drive lasing in neon‐like or nickel‐like ions, typically in the 10‐ to 30‐nm range, while the capillary system is currently limited to driving neon‐like ions at a longer wavelength near 50 nm. Most researchers use nickel‐like ion lasers near 14 nm because they are well matched to the Mo:Si multilayer mirrors, which have peak reflectivity near 13 nm, and are an essential component of applications such as X‐ray laser interferometry.

show abstract

Demonstration of X-Ray Amplification in Transient Gain Nickel-like Palladium Scheme

Cited by 173 publications

References 25 publications

Tabletop transient collisional excitation x-ray lasers

Tabletop transient collisional excitation x-ray lasers

Analysis of radially resolved spectra and potential for lasing in Mo wire array Z pinches

Lasers, ExtremeUVand SoftX‐ray

Contact Info

Product

Resources

About