scholarly journals Fraunhofer Diffraction of Light by Human Enamel

1988 ◽  
Vol 67 (2) ◽  
pp. 484-486 ◽  
Author(s):  
W.J. O'Brien
Keyword(s):  
Reasonable Agreement ◽  
Fraunhofer Diffraction ◽  
First Order ◽  
Neon Laser ◽  
Human Enamel ◽  
Helium Neon Laser ◽  
Diffraction Of Light ◽  
Diffraction Angle ◽  
Diffraction Patterns ◽  
Helium Neon

Fraunhofer diffraction patterns of human enamel samples were photographed with a helium-neon laser beam (λ = 633 nm). The first-order diffraction angle was in reasonable agreement with a prediction based upon enamel prisms acting as a two-dimensional grating. These results support the hypothesis that enamel diffracts light because of the periodic structure of enamel prisms with interprismatic spaces, which act as slits.

Laser Diffractions in Lyotropic Liquid Crystal Formed by Sodium Dodecyl Sulfonate

2010 ◽  
Vol 428-429 ◽  
pp. 263-266 ◽  
Author(s):  
Wei Wei Liu ◽  
Yuan Ming Huang
Keyword(s):  
Liquid Crystal ◽  
Incident Light ◽  
Sodium Dodecyl ◽  
Optical Microscope ◽  
Lyotropic Liquid Crystal ◽  
Sodium Dodecyl Sulfonate ◽  
Neon Laser ◽  
Helium Neon Laser ◽  
Diffraction Angle ◽  
Helium Neon

The laser diffractions phenomenon of surrounding bubbles of lyotropic liquid crystal formed by sodium dodecylsulfonate were investigated with polarized optical microscope and helium-neon laser, respectively. The eleven orders of diffractions can be observed when a beam of helium-neon laser is perpendicularly incident on the surrounding bubbles of lyotropic liquid crystal formed by sodium dodecyl sulfonate. The wavelength of the incident light is 633nm. And we have calculated the periodicity, p, of the grating was 0.211mm, and the small diffraction angle was 0.1146o. So we have simulated the microstructure of surrounding bubbles in the lyotropic liquid crystal formed by sodium dodecyl sulfonate.

STABILITY OF SYMMETRIC BILATERAL DC DISCHARGE IN A RING HELIUM-NEON LASER

2019 ◽  
Vol 69 ◽  
pp. 193-201
Author(s):  
M.V. Chirkin ◽  
◽  
S.V. Ustinov ◽  
V.Yu. Mishin ◽  
◽  
...  
Keyword(s):  
Neon Laser ◽  
Dc Discharge ◽  
Helium Neon Laser ◽  
Helium Neon

Low-Energy Helium-Neon Laser Irradiation Increases the Motility of Cultured Human Keratinocytes

1990 ◽  
Vol 94 (6) ◽  
pp. 822-826 ◽  
Author(s):  
Ann F. Haas ◽  
R. Rivkah Isseroff ◽  
Ronald G. Wheeland ◽  
Pamela A. Rood ◽  
Phillip J. Graves
Keyword(s):  
Laser Irradiation ◽  
Human Keratinocytes ◽  
Low Energy ◽  
Neon Laser ◽  
Helium Neon Laser ◽  
Helium Neon

Raman spectra and lattice dynamics of the α phases of nitrogen and carbon monoxide crystals

1970 ◽  
Vol 48 (19) ◽  
pp. 2265-2271 ◽  
Author(s):  
A. Anderson ◽  
T. S. Sun ◽  
M. C. A. Donkersloot
Keyword(s):  
Carbon Monoxide ◽  
Raman Spectra ◽  
Lattice Dynamics ◽  
Jones Potential ◽  
Lennard Jones ◽  
Neon Laser ◽  
Helium Neon Laser ◽  
First Time ◽  
Helium Neon ◽  
Argon Ion

The Raman spectra of polycrystalline α-nitrogen and α-carbon monoxide have been recorded at 18 °K, using argon–ion and helium–neon laser excitation. Previously undetected peaks at 60 cm−1 for N2 and 90.5 cm−1 for CO are assigned as librational modes, and splitting of the stretching mode in nitrogen is observed for the first time. Spectral features in both the intramolecular and lattice regions are assigned in accordance with accepted crystal structures, and their frequencies compared with those obtained from calculations based on a spherical Lennard–Jones potential and quadrupole–quadrupole interactions between the molecules.

Helium-neon laser irradiation induces effects on cytokine production at the protein and the mRNA level

1993 ◽  
Vol 2 (2) ◽  
pp. 75-83 ◽  
Author(s):  
Jens Oliver Funk ◽  
Andrea Kruse ◽  
Petra Neustock ◽  
Holger Kirchner
Keyword(s):  
Laser Irradiation ◽  
Cytokine Production ◽  
Mrna Level ◽  
Neon Laser ◽  
Helium Neon Laser ◽  
Helium Neon
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