Newsletter on Laser Applications Research: September-2018

Laser Applications Heat Up For Carbon Nanotubes

Carbon nanotubes — a hot engineering science with several potential uses — might realize one in all its fastest applications within the next generation of standards for optical power measurements, that square measure essential for optical device systems utilized in producing, medicine, communications, lithography, space-based sensors and alternative technologies. As delineated  during a forthcoming paper in Applied Optics,* scientists at the National Institute of Standards and Technology (NIST) and therefore the National Renewable Energy Laboratory have created example electrical phenomenon detectors coated with carbon nanotubes. [1]

Rare-earth doped yttrium aluminum garnet single crystal fibers for high power laser applications

Single crystal (SC) fibers give a remarkable various to standard glass fibers for prime power optical maser applications. the restrictions in power scaling in silicon oxide glass fibers arising from thermal lensing, onset of nonlinear phenomena, thermal shock and degradation of the fiber core, etc. hinder performance at high power densities. Since most of those area unit involving the amorphous structure of the silicon oxide inclose the active fiber gain medium, there has been a substantial push to maneuver the fiber optical maser design to a crystalline material. High thermal conduction and low nonlinear gain coefficients of the crystalline material, beside the high surface-area-to-volume quantitative relation of the fiber pure mathematics build Y atomic number 13 mineral (YAG) SC fibers appropriate for application involving high optical power density. The work bestowed during this thesis discusses the expansion and characterization of various YAG SC fibers fully grown by the optical maser heated pedestal growth technique. whereas SC fibers have on paper been shown to own high power handling capabilities, in point of fact their application in sensible devices has been severely restricted by the high transmission losses concerned in such waveguides. during this work, transmission losses in coil-able YAG SC fibers are lowered  to lower than zero.8 dB/m at 1064 nm by optimizing growth conditions and fine-tuning the alignment of the optical parts of the expansion equipment. one amongst the foremost obstacles within the development of SC fibers as effective optical maser medium is that the issue in fabricating a core-clad structure like typical glass fibers. Since SC fibers area unit fully grown from a soften, that may be a true liquid, no cross-sectional pure mathematics will be transferred from the preform to the ultimate fiber. [2]

Ultra-low blaze angle gratings for synchrotron and free electron laser applications

We have developed a technique for the manufacture of diffraction gratings with willy-nilly little blaze angles. These gratings ar created by a method during which a high blaze angle grating created by aeolotropic etching of Si (111) is subjected to planarization and reactive particle etching. Differential etching of the planarization medium and semiconducting material ensures reduction of the blaze angle. perennial application of this method ends up in gratings of accelerating perfection with associate willy-nilly little blaze angle. [3]

Laser Technology Applications in Moon Exploration

The paper analyses the economical follow of optical maser technology applications in Moon exploration. The prospects of developing satellite optical maser telecommunication and navigation systems square measure highlighted. A mathematical model for the motion of satellite artificial satellites developed by the authors is delineated . associate degree approach to the verification of the model victimization terrestrial optical maser go devices is bestowed. [4]

Gingival Depigmentation by Cryosurgery and Laser Application – A Comparative Clinical Study

Aims: the most aim of this study was to check the effectiveness of optical maser over surgical process and to guage the intensity of repigmentation once each interventions throughout a amount of nine months.”

Study Designs: This study was a irregular controlled clinical split mouth trial.

Place and length of Study: Department of odontology, Hindu deity Dental faculty and hospital between January 2013 to Sep 2013.

Methodology: Sample we have a tendency to enclosed twenty subjects(10 males,10 females) age vary 19-23 years with hyper pigmented gum on facial facet of the gum gift within the esthetic zone. A split mouth approach was used whereby one aspect received optical maser and therefore the different aspect received cryotherapy with the selection of the medical aid and aspect chosen by the spin of the coin. Clinical observations for intensity of pigmentation were recorded at baseline, 3, half dozen and nine months once surgery. [5]

Reference

[1] Laser Applications Heat Up For Carbon Nanotubes

January 26, 2005 (web link)

[2] Rare-earth doped yttrium aluminum garnet single crystal fibers for high power laser applications

Bera S. Rare-earth doped yttrium aluminum garnet single crystal fibers for high power laser applications (Doctoral dissertation, Rutgers University-School of Graduate Studies). (Web link)

[3] Ultra-low blaze angle gratings for synchrotron and free electron laser applications

Voronov DL, Gullikson EM, Padmore HA. Ultra-low blaze angle gratings for synchrotron and free electron laser applications. Optics express. 2018 Aug 20;26(17):22011-8. (Web link)

[4] Laser Technology Applications in Moon Exploration

Titov E, Smashniy V, Kozlov P. Laser Technology Applications in Moon Exploration. In2018 International Conference Laser Optics (ICLO) 2018 Jun 4 (pp. 269-269). IEEE. (Web link)

[5] Gingival Depigmentation by Cryosurgery and Laser Application – A Comparative Clinical Study

Ponaganti Venkata Narsimha Rao1, Gautami S. Penmetsa1* and C. D. Dwarakanath1

1Department of Periodontics and Implontology, Vishnu Dental College, Bhimavaram, Andhra Pradesh, India. (Web link)

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