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Soviet Journal of Quantum Electronics

An effective noncollinear four-wave parametric interaction in barium atomic vapor in the field of picosecond pump pulses

R. R. Badalian, Б. В. Крыжановский, David G. Sarkisyan

Published Nov 1, 1988• 0 citations
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A phosphate neodymium glass laser emitting picosecond pulses tunable in the 1.05–1.07 μ range was developed to study nonlinear optical processes in atomic barium vapor. Its temporal characteristics were investigated using a modified second harmonic beam method. Electron stimulated Raman scattering and four-photon parametric conversion in atomic barium vapor were used to obtain efficient conversion of the third harmonic of the picosecond phosphate laser (350–356 nm) to the Stokes (580–600 nm) and anti-Stokes (250–253 nm) waves. The highest conversion quantum efficiency for the Stokes wave was 15%. Electron stimulated Raman scattering in an (6 s 2 ) 1 S –(6 s 7 s ) 1 S –(6 s 6 p ) 1 P 0 system, having a strongly forbidden first transition, was recorded for the first time. In the same system, two-photon pumping generated four-photon parametric superradiance and it was found that the signal and idler waves had anomalously broad spectra (wider than 100 cm −1 ).

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Four-wave parametric interaction of ultrashort optical pulses in a two-level system of barium atoms

David G. Sarkisyan, S O Sapondzhyan

An experimental investigation was made of a four-wave parametric interaction (FWPI) in a field of ultrashort optical pulses (λp ≈0.55 μ) acting on a 1S–1P0 two-level system of barium atomic vapor. It was observed that a pair of new frequencies ν3 and ν4 appeared as a result of FWPI, ν3 being close to ν'tps = 2νp – ν'sp and ν4 being close to ν'sp. This process was observed on approaching the resonance from the low-frequency side. When the resonance was approached from the high-frequency side, conical emission was recorded. It was found that a FWPI in a two-level system subjected to a strong pump field is governed by the third- and fifth-order nonlinear susceptibilities χ(3) and χ(5).

Soviet Journal of Quantum Electronics•Apr 30, 1984•1 citation
An investigation was made of a noncollinear transient four-wave parametric interaction in an atomic barium vapor subjected to the first and second harmonics of tunable neodymium-activated phosphate glass and YAG:Nd3+ lasers emitting picosecond pulses. Variation of the angle between the pump beams was used to control the characteristics of the signal and idler pulses. When the pump radiation was supplied only by a master oscillator, it was possible to generate relatively simply ultrashort pulses tunable near 0.98 μm. A comparison was made with a theory of transient four-wave parametric interaction, which was valid also in saturating pump fields.
A phosphate neodymium glass laser emitting picosecond pulses tunable in the 1.05–1.07 μ range was developed to study nonlinear optical processes in atomic barium vapor. Its temporal characteristics were investigated using a modified second harmonic beam method. Electron stimulated Raman scattering and four-photon parametric conversion in atomic barium vapor were used to obtain efficient conversion of the third harmonic of the picosecond phosphate laser (350–356 nm) to the Stokes (580–600 nm) and anti-Stokes (250–253 nm) waves. The highest conversion quantum efficiency for the Stokes wave was 15%. Electron stimulated Raman scattering in an (6 s 2 ) 1 S –(6 s 7 s ) 1 S –(6 s 6 p ) 1 P 0 system, having a strongly forbidden first transition, was recorded for the first time. In the same system, two-photon pumping generated four-photon parametric superradiance and it was found that the signal and idler waves had anomalously broad spectra (wider than 100 cm −1 ).
An experimental investigation was made of a four-wave parametric interaction (FWPI) in a field of ultrashort optical pulses (λp ≈0.55 μ) acting on a 1S–1P0 two-level system of barium atomic vapor. It was observed that a pair of new frequencies ν3 and ν4 appeared as a result of FWPI, ν3 being close to ν'tps = 2νp – ν'sp and ν4 being close to ν'sp. This process was observed on approaching the resonance from the low-frequency side. When the resonance was approached from the high-frequency side, conical emission was recorded. It was found that a FWPI in a two-level system subjected to a strong pump field is governed by the third- and fifth-order nonlinear susceptibilities χ(3) and χ(5).