Applied Physics Letters

Inversion of the Na resonance line by selective photodissociation of NaI

J. C. White

Published Aug 15, 1978• 27 citations

Abstract

This letter reports the inversion and intense superfluorescent emission of the Na resonance line by selective photodissociation of NaI. The fifth harmonic of a Q-switched Nd : YAG laser at 2128 Å was used to photodissociate NaI to the unbound state Na(3p 2P)+I(5p5 2P3/2). Superfluorescence at the 5896-Å resonance line was observed.

DOI: 10.1063/1.90357

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Applied Physics Letters

Inversion of the Na resonance line by selective photodissociation of NaI

J. C. White

Published Aug 15, 1978• 27 citations

Publisher

Abstract

DOI: 10.1063/1.90357

Related papers

Switched photodissociation: a proposal for the inversion of atomic and molecular species

J. C. White

Optics LettersMay 1, 19807 citations

Laser photodissociation of Na2+ions produced by laser resonant and non-resonant ionisation of Na vapour

F. Roussel, B. Carré, P. Breger +1 more

The authors report direct measurements of the photodissociation of Na 2 + ions created when a Na vapour in the density range 10 12 -10 13 cm -3 is irradiated by a pulsed laser with intensities in the 10 5 -10 6 W cm -2 range. The Na 2 + ions, accelerated by a weak electric field, are photodissociated in a second laser beam tuned to 6040 AA. In a preliminary experiment the Na 2 + ions are formed in the lowest vibrational levels and the measured photodissociation cross section is compared with existing calculations. When the Na vapour is irradiated at one of the 3S 1/2 -3P 1/2,3/2 resonances the photodissociation measurements show the existence of a distribution of rovibrational excited levels of the Na 2 + ions. A discussion is given in terms of associative ionisation in collisions of two Na(3p) atoms. The origin of the Na + ions produced simultaneously with the Na 2 + ions, in the vapour irradiated at resonance, is also discussed.The authors report direct measurements of the photodissociation of Na 2 + ions created when a Na vapour in the density range 10 12 -10 13 cm -3 is irradiated by a pulsed laser with intensities in the 10 5 -10 6 W cm -2 range. The Na 2 + ions, accelerated by a weak electric field, are photodissociated in a second laser beam tuned to 6040 AA. In a preliminary experiment the Na 2 + ions are formed in the lowest vibrational levels and the measured photodissociation cross section is compared with existing calculations. When the Na vapour is irradiated at one of the 3S 1/2 -3P 1/2,3/2 resonances the photodissociation measurements show the existence of a distribution of rovibrational excited levels of the Na 2 + ions. A discussion is given in terms of associative ionisation in collisions of two Na(3p) atoms. The origin of the Na + ions produced simultaneously with the Na 2 + ions, in the vapour irradiated at resonance, is also discussed.

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Jae Won HAHN, Gyu U. Kim, Sang Soo Lee

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Ionization and Energy Pooling in Laser-Excited Na Vapor

Gregory H. Bearman, Jacob J. Leventhal

We have observed ion formation (both ${\mathrm{Na}}^{+}$ and ${\mathrm{Na}}_{2}^{+}$ ) and radiation from high-lying Na states when low-density vapor (\ensuremath{\sim} ${10}^{13}$ ${\mathrm{cm}}^{\ensuremath{-}3}$) is irradiated with a cw dye laser tuned to one of the $D$ lines. The ${\mathrm{Na}}^{+}$ ions probably result from photodissociation of ${\mathrm{Na}}_{2}^{+}$ formed by $\mathrm{Na}(3p)\ensuremath{-}\mathrm{Na}(3p)$ associative ionization, while the high-lying radiating states are formed in energy-pooling reactions.We have observed ion formation (both ${\mathrm{Na}}^{+}$ and ${\mathrm{Na}}_{2}^{+}$) and radiation from high-lying Na states when low-density vapor (\ensuremath{\sim}${10}^{13}$ ${\mathrm{cm}}^{\ensuremath{-}3}$) is irradiated with a cw dye laser tuned to one of the $D$ lines. The ${\mathrm{Na}}^{+}$ ions probably result from photodissociation of ${\mathrm{Na}}_{2}^{+}$ formed by $\mathrm{Na}(3p)\ensuremath{-}\mathrm{Na}(3p)$ associative ionization, while the high-lying radiating states are formed in energy-pooling reactions.

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J. C. White, Don O. Henderson

Conference on Lasers and Electro-OpticsJan 1, 19820 citations

We have observed ion formation (both

{\mathrm{Na}}^{+}

and

{\mathrm{Na}}_{2}^{+}

) and radiation from high-lying Na states when low-density vapor (\ensuremath{\sim}

{10}^{13}

${\mathrm{cm}}^{\ensuremath{-}3}$) is irradiated with a cw dye laser tuned to one of the

D

lines. The

{\mathrm{Na}}^{+}

ions probably result from photodissociation of

{\mathrm{Na}}_{2}^{+}

formed by $\mathrm{Na}(3p)\ensuremath{-}\mathrm{Na}(3p)$ associative ionization, while the high-lying radiating states are formed in energy-pooling reactions.