XUV and Soft X-Ray Radiation from Laser Produced Plasmas as Laboratory Spectroscopic Sources

Laser produced plasmas have been shown to be excellent sources for applications in the XUV and soft X-ray spectral region. We are using a 550 mj, 25 ns (FWHM) ND:YAG laser operating at a repetition rate of 10 Hz to produce plasmas above rotatable solid targets. The focal spot of the laser beam with a 31 cm lens was measured to be 170 μm (approximately twice the diffraction limit), using a diode array having a 170 μm resolution. Broadband output in the soft X-ray region was studied using a windowless PIN photodiode with an A1203 surface covered with a polyethylene filter with transmission between 44 Å and 120 Å. Results are presented for the source’s soft X-ray intensity for several elements as a function of laser energy, focus and driving wavelength, as are preliminary results using the source for high resolution spectroscopy and for soft X-ray lithography.

Download Full-text

High Resolution Spectroscopy of Dite Tokamak in the 10Å Region

International Astronomical Union Colloquium ◽

10.1017/s0252921100107493 ◽

1988 ◽

Vol 102 ◽

pp. 91-94

Author(s):

J. Dunn ◽

R. Barnsley ◽

K.D. Evans ◽

N.J. Peacock

Keyword(s):

Fine Structure ◽

High Resolution ◽

Spectral Region ◽

Intensity Ratio ◽

High Resolution Spectroscopy ◽

X Ray ◽

Experimental Values

AbstractAn account is given of the X-Ray emission from the DITE tokamak in the spectral region 4Å–10Å measured by a Johann curved crystal photographic spectrometer. This high resolution instrument has been used for detailed line identifications eg. of L-shell transitions in the Fe spectrum at wavelengths ∼8Å and of the He-like ion spectra of Al, Si and Ar. The fine structure has been resolved for H-like Mg, Al and Si. Departures from the statistical value of 0.5 forβ, the intensity ratio of the Lyman-αdoublet, have been observed. Experimental values for the fine structure separation are presented for these medium Z metals.

Download Full-text

The Voyage of Metals in the Universe from Cosmological to Planetary Scales: the need for a Very High-Resolution, High Throughput Soft X-ray Spectrometer

Experimental Astronomy ◽

10.1007/s10686-021-09710-2 ◽

2021 ◽

Author(s):

F. Nicastro ◽

J. Kaastra ◽

C. Argiroffi ◽

E. Behar ◽

S. Bianchi ◽

...

Keyword(s):

Chemical Composition ◽

High Resolution ◽

Deep Understanding ◽

High Resolution Spectroscopy ◽

X Ray ◽

Viable Solution ◽

Surrounding Space ◽

Nuclear Processes ◽

The Universe ◽

Very High

AbstractMetals form an essential part of the Universe at all scales. Without metals we would not exist, and the Universe would look completely different. Metals are primarily produced via nuclear processes in stars, and spread out through winds or explosions, which pollute the surrounding space. The wanderings of metals in-and-out of astronomical objects are crucial in determining their own evolution and thus that of the Universe as a whole. Detecting metals and assessing their relative and absolute abundances and energetics can thus be used to trace the evolution of these cosmic components. The scope of this paper is to highlight the most important open astrophysical problems that will be central in the next decades and for which a deep understanding of the Universe’s wandering metals, their physical and kinematical states, and their chemical composition represents the only viable solution. The majority of these studies can only be efficiently performed through High Resolution Spectroscopy in the soft X-ray band.

Download Full-text

1178 J, 527 nm near diffraction limited laser based on a complete closed-loop adaptive optics controlled off-axis multi-pass amplification laser system

High Power Laser Science and Engineering ◽

10.1017/hpl.2021.3 ◽

2021 ◽

Vol 9 ◽

Author(s):

Deen Wang ◽

Xin Zhang ◽

Wanjun Dai ◽

Ying Yang ◽

Xuewei Deng ◽

...

Keyword(s):

Laser Beam ◽

Adaptive Optics ◽

Closed Loop ◽

Focal Spot ◽

Beam Quality ◽

Laser System ◽

Diffraction Limit ◽

Kdp Crystal ◽

Main Amplifier

Abstract A 1178 J near diffraction limited 527 nm laser is realized in a complete closed-loop adaptive optics (AO) controlled off-axis multi-pass amplification laser system. Generated from a fiber laser and amplified by the pre-amplifier and the main amplifier, a 1053 nm laser beam with the energy of 1900 J is obtained and converted into a 527 nm laser beam by a KDP crystal with 62% conversion efficiency, 1178 J and beam quality of 7.93 times the diffraction limit (DL). By using a complete closed-loop AO configuration, the static and dynamic wavefront distortions of the laser system are measured and compensated. After correction, the diameter of the circle enclosing 80% energy is improved remarkably from 7.93DL to 1.29DL. The focal spot is highly concentrated and the 1178 J, 527 nm near diffraction limited laser is achieved.

Download Full-text