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Soviet Journal of Quantum Electronics

An efficient ultrashort pulse frequency converter into various spectral regions which is based on a leucosapphire cell containing barium atomic vapor

David G. Sarkisyan, А. С. Саркисян

Published Apr 1, 1992• 0 citations
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Efficient frequency conversion of ultrashort pulses from the visible (0.55 μ) to the infrared (1.5 μ) in barium vapor

S O Sapondzhyan, David G. Sarkisyan

The frequency of ?p?0.55 ? radiation of ultrashort duration was converted to the infrared (? =1.5 ?) in Ba vapor in the presence of an Ar buffer gas whose pressure was varied between 1 and 300 Torr. The conversion quantum efficiency was 30%. An investigation was made of the mechanisms for population of the 1P10 Ba level. It was found that when the detuning of the pump radiation from the appropriate transition was large, the only mechanism for population of the 1P10 level (followed by lasing at ? =1.5 ?) was optical collisions: Ba(1S0)+Ar+h?p?Ba(1P10)+Ar. For small detunings and low Ar pressures other mechanisms for population of the 1P10 level were also found. Measurements were made of the temporal characteristics of the ? =1.5 ? radiation. Possible reasons for the absence of electronic stimulated Raman scattering are discussed.

Soviet Journal of Quantum Electronics•Aug 31, 1983•4 citations
A frequency converter for ultrashort pulses, based on a leucosapphire cell in which atomic barium vapor, is formed was realized for the first time. This converter makes it possible to generate picosecond and femtosecond pulses in the infrared, visible, ultraviolet, and vacuum ultraviolet spectral regions with a high efficiency. A method is given for determining the gain G for stimulated Raman scattering in a single laser shot. In the case of stimulated electronic Raman scattering in barium vapor with a 30 cm −1 detuning, at a pressure of 0.1 Torr, and for a pump pulse duration of ~ 20 ps, a value of G = (0.2) I p cm/MW was obtained (where I p is the pump intensity) while the threshold pump energy was below 1 μJ. Other possible applications of a leucosapphire cell containing atomic barium vapor are also described.
A sealed leucosapphire cell containing rubidium vapor was used as an effective Q switching element for a flash lamp pumped Nd:YAG laser. The control of the laser parameters such as output energy, pulse length, and repetition rate by simple vapor temperature exchange has been demonstrated. Single giant pulses with energy 100 mJ and duration 20 ns were observed. Trains of 40 ns pulses separated by 6 microsecond(s) intervals were generated at the lowered temperature of the cell. The experiment was verified using a LiF Q switch. The cell is proposed for Q switching of high power and wide spectral range lasers.
The frequency of ?p?0.55 ? radiation of ultrashort duration was converted to the infrared (? =1.5 ?) in Ba vapor in the presence of an Ar buffer gas whose pressure was varied between 1 and 300 Torr. The conversion quantum efficiency was 30%. An investigation was made of the mechanisms for population of the 1P10 Ba level. It was found that when the detuning of the pump radiation from the appropriate transition was large, the only mechanism for population of the 1P10 level (followed by lasing at ? =1.5 ?) was optical collisions: Ba(1S0)+Ar+h?p?Ba(1P10)+Ar. For small detunings and low Ar pressures other mechanisms for population of the 1P10 level were also found. Measurements were made of the temporal characteristics of the ? =1.5 ? radiation. Possible reasons for the absence of electronic stimulated Raman scattering are discussed.