Gaseous Ion Lasers

Davis, C.C.; King, Terence A.

doi:10.1016/b978-0-12-035003-2.50006-1

Cited by 23 publications

(6 citation statements)

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“…Laser spectroscopy has dealt with the research of the mechanisms responsible for the laser action monitored in many molecular, – ion, – and atomic systems , with the aid of light absorption and emission techniques with special emphasis in the UV region in which obtaining molecular−dye systems with high laser gain has taken much effort.…”

Section: Introductionmentioning

confidence: 99%

Fluorescence Spectroscopy and Amplified Spontaneous Emission (ASE) of Phenylimidazoles: Predicted Vibronic Coupling Along the Excited-State Intramolecular Proton Transfer in 2-(2′-Hydroxyphenyl)imidazoles

2008

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Methylation at the 1N position of 2-phenylimidazole provides the shortest wavelength for a liquid-state laser dye reported to date; that is, the 1-methyl-2-phenylimidazole molecule in cyclohexane solution yields amplified spontaneous emission (ASE) with a peak wavelength at 314.5 nm and a constant laser gain value of 5 cm(-1) from 310 to 317 nm. Methyl substitution in this case favors the appearance of laser action (owing to a torsion-vibrational mechanism) in cyclohexane as compared with the nonmethylated species which does not exhibit ASE in this solvent. The 2-(2'-hydroxyphenyl)imidazole molecules give rise to ASE with high gain values (ca. 9 cm(-1)) at 450 and 466 nm. The mechanism of population inversion is understood in terms of a vibronic coupling between the hydroxyl stretching motion and the torsional vibration of the phenyl and imidazole rings. The proton-transfer spectroscopy of 2-(2'-hydroxyphenyl)imidazoles is studied in dioxane, cyclohexane, dimethyl sulfoxide, methanol, and water. The greater the acidity of the solvent the greater the disruption of the intramolecular hydrogen bond; solvent acidity is the main parameter which favors formation of the open-form species in the ground electronic state. Methyl substitution at the 1N position favors formation of the open species for 2-hydroxyphenylimidazoles in the ground electronic state, which decreases their own capacity to undergo ASE. Low-temperature absorption spectroscopy confirms aggregation processes for 2-(2'-hydroxyphenyl)imidazoles in solution. In accordance with X-ray analyses in the solid phase, these molecules form associations through intermolecular chains of the type N-H...O or O-H...N.

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Section: Introductionmentioning

confidence: 99%

Fluorescence Spectroscopy and Amplified Spontaneous Emission (ASE) of Phenylimidazoles: Predicted Vibronic Coupling Along the Excited-State Intramolecular Proton Transfer in 2-(2′-Hydroxyphenyl)imidazoles

2008

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“…This level is connected with the ground state of the argon-ion by an optically allowed transition with an Einstein A coefficient of 9.5 x 10 s s -1 [16] a lifetime of 0.36 ns [17]. This lifetime of the lower laser level is short compared with the lifetime of the upper laser level.…”

Section: Discussionmentioning

confidence: 97%

Optical gain on the 476.5 nm Argon-ion laser line in a gas-target excited by a heavy ion beam

Ulrich

Wieser

Pfaffenberger

et al. 1991

Z. Physik A - Hadrons and Nuclei

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Optical gain on the 476.5 nm Ar II 4p-4s ion laser transition has been observed in argon-gas excited by 2.5 ns pulses of 90 MeV 32S ions with a repetition rate of 4883 Hz. The energy per pulse was 23 gJ. The projectiles were stopped in the target at pressures between 5 and 20 kPa. Gain was determined from a measured transient increase of the intensity of a 476.5 nm probe laser beam sent along the ion beam axis and back reflected by an aluminum foil. The maximum gain observed was (0.4_+0.1) x 10 3 at a target-gas pressure of 5 kPa. Control experiments using krypton as target-gas were performed and yielded a null result. The optical gain observed in argon is consistent with the result from an analysis of spectroscopic studies of rare-gas targets excited by heavy ion beams. PACS" 42.55.Hq; 52.20.Hv

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“…Instead, I will attempt to summarize briefly what we know about argon ion laser mechanisms, most of which we learned in the last half of the 1960s. For a guide to the literature about other ion lasers, see [3, Sections 2.2 and 2.4], for example, or the extensive reviews by Dunnand Ross [34] and Davis and King [35].…”

Section: How Ion Lasers Workmentioning

confidence: 99%