Measurement of the absorption coefficient for the He−Ne laser radiation in a pure hydrogen plasma

1975 ◽  
Vol 8 (2) ◽  
pp. 173-177 ◽  
Author(s):  
Gülay Öke
Keyword(s):  
Laser Radiation ◽  
Absorption Coefficient ◽  
Hydrogen Plasma ◽  
Pure Hydrogen

Absorption coefficients of a hydrogen plasma for laser radiation

1974 ◽  
Vol 11 (1) ◽  
pp. 111-129 ◽  
Author(s):  
James R. Stallcop
Keyword(s):  
Laser Radiation ◽  
Absorption Coefficient ◽  
Hydrogen Plasma ◽  
Radiation Absorption ◽  
Graphical Form ◽  
Wide Range ◽  
Plasma Absorption ◽  
Common Laboratory ◽  
Absorption Measurements

The formalism for the calculation of the absorption of radiation by a hydrogen plasma at common laboratory conditions is summarized. The hydrogen plasma absorption coefficient for laser radiation has been computed for a wide range of electron densities (1015- 1018 cm-3) and temperatures (10 000–40 000 °K). The results of this computation are presented in a graphical form that permits a determination of the absorption coefficient for the following laser wavelengths: 0.176, 0.325, 0.337, 0.442, 0.488, 0.51, 0.633, 0.694, 1.06, 1.15, 2.36, 3.39, 5.40 and 10.6 Μm. The application of these results and laser radiation absorption measurements to plasma diagnostics is discussed briefly.

Optical constants of fully ionized hydrogen plasma for laser radiation

1970 ◽  
Vol 10 (2) ◽  
pp. 111-116 ◽  
Author(s):  
H. Hora ◽  
Hannelore Wilhelm
Keyword(s):  
Laser Radiation ◽  
Optical Constants ◽  
Hydrogen Plasma

A pretreatment process for enhanced diamond nucleation on smooth silicon substrates coated with hard carbon films

1994 ◽  
Vol 9 (8) ◽  
pp. 2148-2153 ◽  
Author(s):  
Z. Feng ◽  
K. Komvopoulos ◽  
I.G. Brown ◽  
D.B. Bogy
Keyword(s):  
Microwave Plasma ◽  
Hydrogen Plasma ◽  
Carbon Film ◽  
Laser Raman Spectroscopy ◽  
Spherical Particles ◽  
Nucleation Density ◽  
Silicon Substrates ◽  
Pure Hydrogen ◽  
Hard Carbon ◽  
Diamond Nucleation

Diamond nucleation on unscratched silicon substrates coated with thin films of hard carbon was investigated experimentally with a microwave plasma-assisted chemical vapor deposition system. A new pretreatment process was used to enhance the nucleation of diamond. Relatively high diamond nucleation densities of ∼108 cm−2 were achieved by pretreating the carbon-coated silicon substrates with a methane-rich hydrogen plasma at a relatively low temperature for an hour. Scanning electron microscopy and laser Raman spectroscopy studies revealed that diamond nucleation occurred from nanometer-sized spherical particles of amorphous carbon produced during the pretreatment. The nanoparticles possessed a structure different from that of the original hard carbon film, with a broad non-diamond Raman peak centered at ∼1500 cm−1, and a high etching resistance in pure hydrogen plasma. The high diamond nucleation density is attributed to the significant percentage of tetrahedrally bonded (sp3) atomic carbon configurations in the nanoparticles and the presence of sufficient high-surface free-energy sites on the pretreated surfaces.

Observation of Population Inversions in a Freely Expanding Pure Hydrogen Plasma

1980 ◽  
Vol 19 (7) ◽  
pp. L386-L388 ◽  
Author(s):  
Tamio Hara ◽  
Kunihiko Kodera ◽  
Manabu Hamagaki ◽  
Kouzi Matsunaga ◽  
Masaaki Inutake ◽  
...  
Keyword(s):  
Hydrogen Plasma ◽  
Pure Hydrogen

Silicon film formation by chemical transport in atmospheric-pressure pure hydrogen plasma

2007 ◽  
Vol 102 (2) ◽  
pp. 023302 ◽  
Author(s):  
Hiromasa Ohmi ◽  
Hiroaki Kakiuchi ◽  
Yoshinori Hamaoka ◽  
Kiyoshi Yasutake
Keyword(s):  
Atmospheric Pressure ◽  
Film Formation ◽  
Hydrogen Plasma ◽  
Silicon Film ◽  
Chemical Transport ◽  
Pure Hydrogen

Filamentation of CO2-Laser Radiation in an Underdense Hydrogen Plasma

1979 ◽  
Vol 43 (20) ◽  
pp. 1502-1505 ◽  
Author(s):  
A. Ng ◽  
D. Salzmann ◽  
A. A. Offenberger
Keyword(s):  
Laser Radiation ◽  
Co2 Laser ◽  
Hydrogen Plasma ◽  
Co2 Laser Radiation

Temperature dependence of the absorption coefficient of optical glasses exposed to laser radiation

1979 ◽  
Vol 9 (2) ◽  
pp. 193-198 ◽  
Author(s):  
Nikolai E Kask ◽  
V V Radchenko ◽  
Gennadii M Fedorov ◽  
D B Chopornyak
Keyword(s):  
Laser Radiation ◽  
Absorption Coefficient ◽  
Temperature Dependence ◽  
Optical Glasses
Sign in / Sign up

Export Citation Format

Share Document