Enhancement of Ne-like Ar 46.9 nm laser output by mixing appropriate He ratio at low pressure

Zhao, Yijun; Xie, Yongshuai; Wang, Q.; Liu, T.

doi:10.1140/epjd/e2008-00181-4

Cited by 5 publications

(3 citation statements)

References 7 publications

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“…1b. The spike of Xe plasma emission is wider than the 46.9 nm laser spike (~2 ns) [11,12] in pulse duration. Therefore, the spike of Xe plasma emission should be carefully studied to make certain whether it is a laser spike or not.…”

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confidence: 84%

Experimental Study of Soft X-ray Emission from Pd-Like Xe Pumped by Capillary Discharge

Zhao

Xie

et al. 2014

J Appl Spectrosc

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Under different pressures, the temporal evolution and spectra of soft X-ray emission from a capillary discharge xenon plasma were measured with an X-ray diode and spectrometer, respectively. Transition lines from Xe 8+ to Xe 11+ were clearly observed and showed up as small spikes in the temporal profi le. Within the 5-20 nm wavelength region, the spectra originating from transitions in the Xe 8+ to Xe 11+ ion species were observed bet ween 9 and 19 Pa. Among these spectral lines, the 16.47 nm line arises from the transition between the 4d 9 5p 1 P 1 level and the ground level of Pd-like xenon (Xe 8+ ). The 4d 9 5p 1 P 1 level is the lower level of the 41.8 nm laser transition of 4d 9 5d 1 S 0 -4d 9 5p 1 P 1 . However, lasing output at 41.8 nm was not observed. According to our analysis, in order to realize the 41.8 nm lasing output, it is necessary to increase the electron temperature and the abundance of Pd-like Xe ions in the capillary discharge plasma.Introduction. Soft X-ray lasers pumped by capillary discharge have been demonstrated to be a promising scheme that meets practical requirements in applications [1]. Ever since the fi rst demonstration of a discharge pumped table-top soft X-ray laser by J. J. Rocca in 1994, there have been realized Ne-like Ar 46.9 [2] and 69.8 nm [3], Ne-like S 60.8 nm [4], and Ne-like Cl 52.9 nm [5] soft X-ray lasers pumped by capillary discharge. The Ne-like Ar 46.9 nm soft X-ray laser was amplifi ed in a highly saturated regime, and its average laser output pulse energy of 0.88 mJ and peak power of 0.6 MW were obtained at a repetition rate of 4 Hz [6]. Ne-like ions have a stable closed shell confi guration, which is favorable to maintain the gain time of the laser.Despite the early success of Ne-like Ar 46.9 nm soft X-ray laser, no soft X-ray laser with wavelength shorter than 46.9 nm has been realized by capillary discharge based on the electron collisional excitation scheme. A shorter wavelength laser has many advantages such as diagnostics of higher density plasmas, higher resolution metrology, and so on. Therefore, it is of signifi cant importance to realize shorter wavelength lasers with the electron collisional excitation scheme in a capillary discharge plasma. Because of this, we are focusing on soft X-ray lasers at 41.8 nm in Pd-like Xe (Xe 8+ ), which have a stable closed shell confi guration. Based on the collisionally pumped optical-fi eld-ionization (OFI) scheme, many groups have obtained Pd-like Xe 41.8 nm amplifi cation pumped by a femtosecond laser system [7-10]. The saturated amplifi cation of Pd-like Xe 41.8 nm lasers has been realized with the OFI scheme [8]. Compared to the OFI scheme, the capillary discharge scheme has the advantage of longer plasma length, lower cost, and simpler operation. It is believed that a Pd-like Xe 41.8 nm soft X-ray laser can be achieved with higer energy, longer gain lifetime, better beam quality, longer gain length, and higher energy conversion effi ciency.In this paper, by discharging gaseous xenon in a capillary to Z-pinch th...

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confidence: 84%

Experimental Study of Soft X-ray Emission from Pd-Like Xe Pumped by Capillary Discharge

Zhao

Xie

et al. 2014

J Appl Spectrosc

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“…Plasma channeling is one of the most fascinating off-shoots of laser plasma interaction research, due to its potential applications in laser guiding in atmosphere (Alexeev et al, 2005;Woste et al, 2006) particle acceleration (Geddes et al, 2004;Kumar et al, 2010) transportation of ion beams (Penache et al, 2002), in the development of X-ray lasers (Chou et al, 2007;Zhao et al, 2008) etc. To date, however, laser propagation has been severely limited by the lack of a controllable method for extending the propagation distance of the focused laser pulse.…”

Section: Introductionmentioning

confidence: 99%

“…As a result the laser intensity falls off as it propagates forward and the length of the ensuing tunnel ionized plasma column is limited. Zhao et al (2008) reported the enhancement of Ne-like Ar at 46.9 nm by mixing appropriate Helium ratio at low pressure by the plasma channeling process. Durfee and Milchberg (1993) successfully created a plasma waveguide, with minimum plasma density on axis, and demonstrated that the intense laser pulses can be guided more then 20 Rayleigh lengths in plasma by using two pulse techniques.…”

Section: Introductionmentioning

confidence: 99%

Laser focusing and multiple ionization of Ar in a hydrogen plasma channel created by a pre-pulse

Verma

Sharma

2011

Laser Part. Beams

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A model for plasma channel formation by a laser pre-pulse in a low Z gas (Hydrogen) embedded with high Z atoms (Ar) is developed. The laser of intensity I ≅ 10 14 W/cm 2 ionizes hydrogen atoms fully whereas Ar atoms are ionized only singly. After the first pulse is gone, plasma expands on the time scale of a nanosecond to produce a hydrogen plasma channel with minimum density on the axis. A second intense short pulse laser of intensity I ≥ 10 16 W/cm 2 gets focused. It tunnel ionizes the remaining Ar. The Ar acquires Ar 8+ charge state after loosing 8 ions and acquires Ne like configuration and could emit X-rays.

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The study of capillary discharge Ne-like 46.9 nm laser with a 2.5 mm inner diameter capillary

Zhao,

Cui,

Wang

et al. 2025

Optics Communications

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Enhancement of Ne-like Ar 46.9 nm laser output by mixing appropriate He ratio at low pressure

Cited by 5 publications

References 7 publications

Experimental Study of Soft X-ray Emission from Pd-Like Xe Pumped by Capillary Discharge

Experimental Study of Soft X-ray Emission from Pd-Like Xe Pumped by Capillary Discharge

Laser focusing and multiple ionization of Ar in a hydrogen plasma channel created by a pre-pulse

The study of capillary discharge Ne-like 46.9 nm laser with a 2.5 mm inner diameter capillary

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