Modeling of optical absorption and scattering of laser radiation in silicone polymers used in fiber optics

2021 ◽  
Author(s):  
Ivan O. Khramov ◽  
Renat I. Shaidullin ◽  
Nikita Kovalenko ◽  
Renata Ismagilova ◽  
Tatiana Karpova ◽  
...  
Keyword(s):  
Laser Radiation ◽  
Optical Absorption ◽  
Fiber Optics ◽  
Silicone Polymers

Growth and Characterization of PbI2 Thin Films by Vacuum Thermal Evaporation

2013 ◽  
Vol 24 ◽  
pp. 1-6 ◽  
Author(s):  
Harshita Agrawal ◽  
A.G. Vedeshwar ◽  
Vibhav K. Saraswat
Keyword(s):  
Thin Films ◽  
Optical Absorption ◽  
Band Gap ◽  
Fiber Optics ◽  
Thermal Evaporation ◽  
Quantum Confinement Effect ◽  
X Ray Diffraction ◽  
Lead Iodide ◽  
Size Growth ◽  
Evaporation Technique

The aim of this study was to investigate the morphology and optical absorption of PbI2 thin films. PbI2 films of different thickness were deposited on glass substrate at ambient temperature by thermal evaporation technique. The deposition rate was optimized at 1-2 nm/s to grow uniform good quality films. The structural analysis of the films was carried out by X-ray diffraction (XRD). The morphology of so prepared films was studied by Scanning Electron Microscope (SEM). The absorption spectra were recorded using a UV-Vis fiber optics based spectrophotometer. All the measurements in the present work were carried out at room temperature (~300 K). PbI2 seems to have a very strong affinity for the growth of preferred (001) orientation. The d spacing of (00l) peaks match quite well with ASTM data for 2H polytype of PbI2 which confirms the stoichiometry. A uniform spherical grain size growth is clearly evident from SEM micrographs. Optical absorption analysis indicates that the Lead Iodide is having a direct optical band gap of about 2.45 eV. The variation of band gap with film thickness could be qualitatively understood as due to the quantum confinement effect.

scholarly journals Exciton states and optical absorption in quantum wires under laser radiation

2010 ◽  
Vol 374 (22) ◽  
pp. 2259-2261 ◽  
Author(s):  
C. González-Santander ◽  
F. Domínguez-Adame
Keyword(s):  
Laser Radiation ◽  
Optical Absorption ◽  
Quantum Wires

scholarly journals Исследование влияния ионной проводимости на коэффициент оптического поглощения кристаллов трибората лития при воздействии высокоинтенсивного непрерывного лазерного излучения

2020 ◽  
Vol 128 (9) ◽  
pp. 1258
Author(s):  
И.В. Грищенко ◽  
Ю.С. Стирманов ◽  
А.В. Коняшкин ◽  
О.А. Рябушкин
Keyword(s):  
Heat Transfer ◽  
Laser Radiation ◽  
Ionic Conductivity ◽  
Optical Absorption ◽  
High Intensity ◽  
Transfer Coefficients ◽  
Lithium Triborate ◽  
Heat Transfer Coefficients ◽  
High Intensity Laser ◽  
Intensity Laser

We have introduced the results of investigation of influence of ionic conductivity of lithium triborate crystal (LBO) on the optical absorption and the heat transfer coefficients in incident of high-intensity laser radiation at wavelength 1070 nm.

scholarly journals Optical absorption induced by UV laser radiation in Ge-doped amorphous silica probed by in situ spectroscopy

2007 ◽  
Vol 4 (3) ◽  
pp. 1143-1146 ◽  
Author(s):  
F. Messina ◽  
M. Cannas ◽  
R. Boscaino ◽  
S. Grandi ◽  
P. Mustarelli
Keyword(s):  
Laser Radiation ◽  
Optical Absorption ◽  
Amorphous Silica ◽  
In Situ Spectroscopy ◽  
Uv Laser

scholarly journals Optoacoustic Sensing of Surfactant Crude Oil in Thermal Relaxation and Nonlinear Regimes

Sensors ◽  
2021 ◽  
Vol 21 (18) ◽  
pp. 6142
Author(s):  
Pavel Subochev ◽  
Alexey Kurnikov ◽  
Ekaterina Sergeeva ◽  
Mikhail Kirillin ◽  
Ivan Kapustin ◽  
...  
Keyword(s):  
Laser Radiation ◽  
Optical Absorption ◽  
Crude Oil ◽  
Water Surface ◽  
Oil Pollution ◽  
Thermal Relaxation ◽  
Local Deformation ◽  
Ultra Wideband ◽  
Optical Absorption Coefficient

We propose a laser optoacoustic method for the complex characterization of crude oil pollution of the water surface by the thickness of the layer, the speed of sound, the coefficient of optical absorption, and the temperature dependence of the Grüneisen parameter. Using a 532 nm pulsed laser and a 1–100 MHz ultra-wideband ultrasonic antenna, we have demonstrated the capability of accurate (>95%) optoacoustic thickness measurements in the 5 to 500-micron range, covering 88% of slicks observed during 2010 oil spill in the Gulf of Mexico. In the thermal relaxation regime of optoacoustic measurements, the value of optical absorption coefficient (30 mm−1) agreed with the data of independent spectrophotometric measurements, while the sound speed (1430 m/s) agreed with the tabular data. When operating in a nonlinear regime, the effect of local deformation of the surface of the oil film induced by heating laser radiation was revealed. The dose-time parameters of laser radiation ensuring the transition from the thermal relaxation regime of optoacoustic generation to nonlinear one were experimentally investigated. The developed OA method has potential for quantitative characterization of not only the volume, but also the degree and even the type of oil pollution of the water surface.

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