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Calculation of the bandwidth of a graded-index optical fiber using experimentally measured quantities

Computer simulation of Fresnel diffraction from rectangular apertures and obstacles using the Fresnel integrals approach

In this paper, we describe a new computer simulation technique of generating Fresnel diffraction images from rectangular apertures of arbitrary dimensions by using Fresnel integrals instead of the more common fast Fourier ...

Construction and operation of a dispersive laser raman spectrograph using interference filter

A dispersive laser Raman system was designed and constructed using a helium-neon (He-Ne) laser as an excitation source, and an interference filter in the reflection mode for Raleigh filtering instead of the more common ...

Construction of laser raman system using diode laser and Its performance

We constructed a laser Raman system using a commercially available infrared diode laser. The diode laser is used without any temperature controller in a stabilized power supply. Good quality Raman spectra of sufficient ...

Detection of multiple elements in coal samples from Bangladesh by laser-induced breakdown spectroscopy

Laser-induced breakdown spectroscopy (LIBS) was used to analyze the coal samples from the Barapukuria coal mine of Bangladesh and coal from eastern India. Besides the major elements carbon and silicon, a number of minor ...

Detection of trace amount of arsenic in groundwater by laser-induced breakdown spectroscopy and adsorption

LIBS technique coupled with adsorption has been applied for the efficient detection of arsenic in liquid. Several adsorbents like tea leaves, bamboo slice, charcoal and zinc oxide have been used to enable sensitive detection ...

Determination of Ca content of coral skeleton by analyte additive method using the LIBS technique

Laser-induced breakdown spectroscopic (LIBS) technique was used to study the elemental prole of coral skeletons. Apart from calcium and carbon, which are the main elemental constituents of coral skeleton, elements like Sr, ...

Determination of ratio of unsaturated to total fatty acids in edible oils by laser Raman spectroscopy

In this study, a homemade laser Raman spectrometer was used to examine the Raman spectra of different edible oils, such as canola, corn, soybean, sunflower, palm and coconut oils. To avoid severe fluorescence effects which ...

Determination of the ash content of coal without ashing: a simple technique using laser-induced breakdown spectroscopy

The bituminous coal samples were analyzed using the technique of laser-induced breakdown spectroscopy (LIBS). The fraction of the ash content of the coal was spectroscopically determined by a technique requiring only two ...

Electron paramagnetic resonance spectra of Fe2+ and Fe3+ ions in SrO: evidence for off-centre displacement of Fe2+ ions

The electron paramagnetic resonance (EPR) spectra of Fe2+ and Fe3+ ions in single crystals of SrO are reported. Fe3+ ions occupy sites of orthorhombic symmetry and their EPR spectra have been fitted with an S=5/2 ...

Elemental analyses and determination of lead content in kohl (stone) by laser-induced breakdown spectroscopy

Elemental analyses of kohl (stone) samples collected from three different parts of the world were performed using laser-induced breakdown spectroscopy (LIBS). The analyses indicated that lead (Pb), copper (Cu), silver (Ag), ...

Elemental profiling and determination of Ti content of the beach sand samples of Bangladesh using LIBS technique

Laser-induced breakdown spectroscopic technique was used to study the elemental profile of beach sand samples of Bangladesh. Apart from Silicon, which is the main elemental constituent of sand, the presence of Li, Na, Mg, ...

Elemental profiling and identification of eco-toxic elements in agricultural soil by laser-induced breakdown spectroscopy

Laser induced breakdown spectroscopy (LIBS) was used to determine the elemental content and to detect probable eco-toxic elements in agricultural soil in Gazipur, Bangladesh (latitude: 24.0958° N, longitude: 90.4125° E). ...

Elemental profiling of surface water around Dhaka city by laser induced breakdown spectroscopy

Using the technique of Laser Induced Breakdown Spectroscopy (LIBS), which uses a pulsed laser to create plasma and advanced spectroscopic techniques, we analyzed the contents of surface water (river water) around the city ...

Fabrication of gold nanoparticles in water by laser ablation technique and their characterization

A colloidal solution of gold nanoparticles in deionized nanopure water was produced by laser ablation technique without the use of any chemical/surfactant. Spectral characterization and morphological studies of these ...

Identification of multiple rare earths and associated elements in raw monazite sands by laser-induced breakdown spectroscopy

Laser-induced breakdown spectroscopy (LIBS) is an emerging and promising tool for rapid and efficient elemental analysis. We used the LIBS technique to analyze the raw monazite sands collected from the beaches in southern ...