A5079740334- Atomic and Molecular Physics
- Advanced Chemical Physics Studies
- Laser-induced spectroscopy and plasma
- Analytical chemistry methods development
- Mass Spectrometry Techniques and Applications
- Spectroscopy and Laser Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Cold Atom Physics and Bose-Einstein Condensates
- Cultural Heritage Materials Analysis
- Mercury impact and mitigation studies
- Laser Design and Applications
- Laser-Matter Interactions and Applications
- Advanced Fiber Laser Technologies
- Photonic Crystal and Fiber Optics
- Atomic and Subatomic Physics Research
- Advanced Fiber Optic Sensors
- Heavy Metals in Plants
- Organic Electronics and Photovoltaics
- Atmospheric Ozone and Climate
- Electron and X-Ray Spectroscopy Techniques
- Spectroscopy and Quantum Chemical Studies
- Quantum optics and atomic interactions
- Molecular Junctions and Nanostructures
- Ga2O3 and related materials
- Nuclear physics research studies
Indus Hospital
2025
Quaid-i-Azam University
2015-2024
National Institute of Technology Rourkela
2024
Abdus Salam Centre for Physics
2015-2024
University of Azad Jammu and Kashmir
2017-2021
John Carroll University
2017
Bridge University
2017
University of Bonn
1985-2010
Pakistan Institute of Nuclear Science and Technology
1995-2008
University of South Carolina
2003
We report spectroscopic studies of the zinc plasma produced in air by three harmonics a Q-switched pulsed Nd : YAG laser at 1064, 532 and 355 nm. The electron temperature has been determined from intensity ratio transitions (4s4d 3D3 → 4s4p 3P2) 334.5 nm (4s5s 3S1 481.0 neutral zinc, whereas number density evaluated Stark broadening transition It is observed that both these parameters decrease as distance target surface increases it with an increase irradiance. power law fitted to experimental data.
Abstract LASER induced breakdown spectroscopy (LIBS) has been used for the quantitative analysis of Cu–Ni alloy known composition (75% Cu, 25% Ni) using one line calibration free-LIBS (OLCF-LIBS), self-calibration-LIBS (SC-LIBS), free LIBS (CF-LIBS), time flight-mass (TOF-MS), energy dispersive X-ray (EDX) and fluorescence (XRF). For LIBS-based studies, plasma was generated by focusing beam a Q-switched Nd:YAG laser (532 nm, pulse about 200 mJ, 5 ns duration) while sample placed in air at an...
In this paper, the zirconia (ZrO
We present a comparative study of the collinear and orthogonal pre-ablation dual pulse configurations laser induced breakdown spectroscopy (LIBS) silver using Nd:YAG lasers. The effect inter-pulse delay ratio energies on signal intensity enhancement for both have been investigated. Using first at 532 nm second 1064 delayed by 5 μs, we achieved nearly 2 times in double-pulsed configuration 12 as compared to SP LIBS. It is ascertained that optimized value between two lasers, neutral lines...
This paper presents the investigations toward direct use of bentonite clay (Al2H2O6Si) nanoparticles to act like a saturable absorber (SA) for Q-switched pulse operation an erbium-doped fiber laser (EDFL). The measured results reveal that with incorporation nanopowder as SA, EDFL is realized Q-switching mechanism starting at pump power 30.8 mW, and emission wavelength was noticed 1562.94 nm 142 mW power. With increased from 278.96 temporal parameters including minimum duration maximum...
A comparative study of single and double pulse laser induced breakdown spectroscopy (LIBS) using the fundamental (1064 nm) second harmonics (532 Nd:YAG lasers is presented. The collinear configuration yields more than three hundred times signal enhancement in singly ionized aluminum lines as compared to LIBS spectrum. effect interpulse delay between two pulses energies ratio spectrum are studied. comparison variations plasma parameters along plume axis has also been
New observations of the 5p spectra Cs i and Ba are reported. The extreme complexity structure does not permit precise configuration labels to be attached all excited levels. Nevertheless, more than 160 transitions in have been ordered into 14 series converging on experimentally known levels parent ion. An attempt has made analyse limit by comparison with data for I Hartree-Fock atomic calculations. results obtained consistent previous interpretations double ionization anomaly I. Further...
Abstract In this work, we investigate the effect of carbon-doped silver nanoparticles on Q-switched performance erbium-doped fiber laser (EDFL). The were synthesized using a ablation method. prepared inserted between ferrules adhesion process index-matched gel. Incorporating saturable absorber inside cavity initiates stable mechanism at 11.2 mW threshold power. measured results demonstrate that as pump power EDFL increases from to 267 mW, pulse repetition, and width tuned 21.33 95.2 kHz...
<title>Abstract</title> Hemophagocytic lympho histiocytosis is a deadly hyperinflammatory clinical response marked by excessive inflammation and tissue damage that can be secondarily triggered infections, autoimmune malignancies. lymph usually caused viruses rarely bacterial infections like Salmonella Typhi. The rising incidence of extended drug-resistant Typhi in low-income countries Pakistan lead to numerous complications but hardly secondary histiocytosis. We report the first case whose...
Abstract The ablation of calcium sample has been studied by the optical emission spectroscopy evolving plasma using fundamental, second, and third harmonic a Nd:YAG laser, which reveals numerous transitions due to neutral singly ionized calcium. measurements have performed determine electron temperature number density their spatial behavior. In addition, behavior as function laser irradiance ambient gas pressure studied. processes photon absorption in through inverse bremsstrahlung...
We present new studies on the effects of laser wavelengths, pulse energy ratio and interpulse delay between two pulses in collinear dual configuration laser-induced breakdown spectroscopy (LIBS) an iron sample air using fundamental (1064 nm) second harmonics (532 Nd:YAG lasers. In LIBS, optimum value with appropriate combination ratio, yields a 30 times signal intensity enhancement neutral lines as compared single LIBS. A comparison spatial variations electron temperature along axis plume...