Abstract

The first known observation of a multiphoton-laser-induced inelastic collision is reported. During the collision of Ba and Tl ground-state atoms, two photons are absorbed, resulting in the simultaneous excitation of both atoms to excited states. The collisional absorption was maximized when the photon sum energy was equal to the sum energy of the excited atoms for infinite separation.

© 1981 Optical Society of America

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References

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  1. S. E. Harris et al., in Tunable Lasers and Applications, S. Mooradian, T. Jaeger, P. Stoketh, eds. (Springer-Verlag, New York, 1976), p. 193.
  2. Ph. Cahuzac, P. E. Toschek, Phys. Rev. Lett. 40, 1087 (1978).
    [CrossRef]
  3. J. C. White, G. A. Zdasiuk, J. F. Young, S. E. Harris, Phys. Rev. Lett. 41, 1709 (1978); Phys. Rev. Lett. 42, 480(E) (1979).
    [CrossRef]
  4. J. C. White, G. A. Zdasiuk, J. F. Young, S. E. Harris, Opt. Lett. 4, 137 (1979).
    [CrossRef] [PubMed]
  5. J. C. White, R. R. Freeman, P. F. Liao, Opt. Lett. 5, 120 (1980).
    [CrossRef] [PubMed]
  6. W. R. Green et al., Phys. Rev. Lett. 42, 970 (1979).
    [CrossRef]
  7. W. R. Green, M. D. Wright, J. Lukasik, J. F. Young, S. E. Harris, Opt. Lett. 4, 265 (1979).
    [CrossRef] [PubMed]
  8. J. C. White, Opt. Lett. 5, 239 (1980).
    [CrossRef] [PubMed]
  9. S. E. Harris, D. B. Lidow, Phys. Rev. Lett. 33, 675 (1974); Phys. Rev. Lett. 34, 172 (E) (1975).
  10. S. E. Harris, J. C. White, IEEE J. Quantum. Electron. QE-13, 972 (1977).
    [CrossRef]
  11. L. L. Shimon, N. M. Erdevdi, Opt. Spectrosc. 42, 137 (1977).
  12. B. R. Marx, J. Simons, L. Allen, J. Phys. B 11, L273 (1978).
    [CrossRef]
  13. G. R. Harrison, ed., MIT Wavelength Tables (MIT Press, Cambridge, Mass., 1969).

1980 (2)

1979 (3)

1978 (3)

Ph. Cahuzac, P. E. Toschek, Phys. Rev. Lett. 40, 1087 (1978).
[CrossRef]

J. C. White, G. A. Zdasiuk, J. F. Young, S. E. Harris, Phys. Rev. Lett. 41, 1709 (1978); Phys. Rev. Lett. 42, 480(E) (1979).
[CrossRef]

B. R. Marx, J. Simons, L. Allen, J. Phys. B 11, L273 (1978).
[CrossRef]

1977 (2)

S. E. Harris, J. C. White, IEEE J. Quantum. Electron. QE-13, 972 (1977).
[CrossRef]

L. L. Shimon, N. M. Erdevdi, Opt. Spectrosc. 42, 137 (1977).

1974 (1)

S. E. Harris, D. B. Lidow, Phys. Rev. Lett. 33, 675 (1974); Phys. Rev. Lett. 34, 172 (E) (1975).

Allen, L.

B. R. Marx, J. Simons, L. Allen, J. Phys. B 11, L273 (1978).
[CrossRef]

Cahuzac, Ph.

Ph. Cahuzac, P. E. Toschek, Phys. Rev. Lett. 40, 1087 (1978).
[CrossRef]

Erdevdi, N. M.

L. L. Shimon, N. M. Erdevdi, Opt. Spectrosc. 42, 137 (1977).

Freeman, R. R.

Green, W. R.

Harris, S. E.

J. C. White, G. A. Zdasiuk, J. F. Young, S. E. Harris, Opt. Lett. 4, 137 (1979).
[CrossRef] [PubMed]

W. R. Green, M. D. Wright, J. Lukasik, J. F. Young, S. E. Harris, Opt. Lett. 4, 265 (1979).
[CrossRef] [PubMed]

J. C. White, G. A. Zdasiuk, J. F. Young, S. E. Harris, Phys. Rev. Lett. 41, 1709 (1978); Phys. Rev. Lett. 42, 480(E) (1979).
[CrossRef]

S. E. Harris, J. C. White, IEEE J. Quantum. Electron. QE-13, 972 (1977).
[CrossRef]

S. E. Harris, D. B. Lidow, Phys. Rev. Lett. 33, 675 (1974); Phys. Rev. Lett. 34, 172 (E) (1975).

S. E. Harris et al., in Tunable Lasers and Applications, S. Mooradian, T. Jaeger, P. Stoketh, eds. (Springer-Verlag, New York, 1976), p. 193.

Liao, P. F.

Lidow, D. B.

S. E. Harris, D. B. Lidow, Phys. Rev. Lett. 33, 675 (1974); Phys. Rev. Lett. 34, 172 (E) (1975).

Lukasik, J.

Marx, B. R.

B. R. Marx, J. Simons, L. Allen, J. Phys. B 11, L273 (1978).
[CrossRef]

Shimon, L. L.

L. L. Shimon, N. M. Erdevdi, Opt. Spectrosc. 42, 137 (1977).

Simons, J.

B. R. Marx, J. Simons, L. Allen, J. Phys. B 11, L273 (1978).
[CrossRef]

Toschek, P. E.

Ph. Cahuzac, P. E. Toschek, Phys. Rev. Lett. 40, 1087 (1978).
[CrossRef]

White, J. C.

J. C. White, Opt. Lett. 5, 239 (1980).
[CrossRef] [PubMed]

J. C. White, R. R. Freeman, P. F. Liao, Opt. Lett. 5, 120 (1980).
[CrossRef] [PubMed]

J. C. White, G. A. Zdasiuk, J. F. Young, S. E. Harris, Opt. Lett. 4, 137 (1979).
[CrossRef] [PubMed]

J. C. White, G. A. Zdasiuk, J. F. Young, S. E. Harris, Phys. Rev. Lett. 41, 1709 (1978); Phys. Rev. Lett. 42, 480(E) (1979).
[CrossRef]

S. E. Harris, J. C. White, IEEE J. Quantum. Electron. QE-13, 972 (1977).
[CrossRef]

Wright, M. D.

Young, J. F.

Zdasiuk, G. A.

J. C. White, G. A. Zdasiuk, J. F. Young, S. E. Harris, Opt. Lett. 4, 137 (1979).
[CrossRef] [PubMed]

J. C. White, G. A. Zdasiuk, J. F. Young, S. E. Harris, Phys. Rev. Lett. 41, 1709 (1978); Phys. Rev. Lett. 42, 480(E) (1979).
[CrossRef]

IEEE J. Quantum. Electron. (1)

S. E. Harris, J. C. White, IEEE J. Quantum. Electron. QE-13, 972 (1977).
[CrossRef]

J. Phys. B (1)

B. R. Marx, J. Simons, L. Allen, J. Phys. B 11, L273 (1978).
[CrossRef]

Opt. Lett. (4)

Opt. Spectrosc. (1)

L. L. Shimon, N. M. Erdevdi, Opt. Spectrosc. 42, 137 (1977).

Phys. Rev. Lett. (4)

Ph. Cahuzac, P. E. Toschek, Phys. Rev. Lett. 40, 1087 (1978).
[CrossRef]

J. C. White, G. A. Zdasiuk, J. F. Young, S. E. Harris, Phys. Rev. Lett. 41, 1709 (1978); Phys. Rev. Lett. 42, 480(E) (1979).
[CrossRef]

S. E. Harris, D. B. Lidow, Phys. Rev. Lett. 33, 675 (1974); Phys. Rev. Lett. 34, 172 (E) (1975).

W. R. Green et al., Phys. Rev. Lett. 42, 970 (1979).
[CrossRef]

Other (2)

S. E. Harris et al., in Tunable Lasers and Applications, S. Mooradian, T. Jaeger, P. Stoketh, eds. (Springer-Verlag, New York, 1976), p. 193.

G. R. Harrison, ed., MIT Wavelength Tables (MIT Press, Cambridge, Mass., 1969).

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Figures (3)

Fig. 1
Fig. 1

Energy-level diagram for two-photon laser-induced collision in Tl and Ba. During the collision of the ground-state atoms, two laser photons at 4489 Å are absorbed, resulting in the excitation of the Tl atom to the 7s 2S1/2 state and the Ba atom to the 6 p 1 P 1 state. Fluorescence from the Tl (7s 2S1/2) level at 5350 Å is used as the detection mechanism.

Fig. 2
Fig. 2

5350-Å Tl fluorescence as a function of input-laser wavelength. The large, off-scale peak at 4487 Å corresponds to two-photon excitation of Tl ( 9 p 2 P 3 / 2 ) followed by cascade decay. (a) Plot taken at a cell temperature of 1100°C. The narrow peaks at 4487.6, 4488.6, and 4489.6 Å correspond to tabulated Ce transitions. (b) Plot taken at a cell temperature of 1600°C (note change of vertical scale). The two-photon pair absorption is now much larger and peaks, within the experimental uncertainty of 0.3 Å, at λ(R = ∞) = 4489 Å.

Fig. 3
Fig. 3

Relative magnitude of the two-photon laser-induced collision as a function of incident laser-power density.

Equations (4)

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Ba ( 6 s 2 S 1 ) + Tl ( 6 p P 1 / 2 2 ) + 2 ℏω ( 4489 Å ) Ba ( 6 p P 1 1 ) + Tl ( 7 s S 2 1 / 2 ) .
σ c = π ( μ 1 E 1 2 Δ ω 1 ) 2 ( μ 2 E 2 2 Δ ω 2 ) 2 ( 2 μ 3 μ 4 V ¯ ρ 0 ) 2 ,
W c = N [ Ba ( 6 s 2 S 1 0 ) ] σ c V ¯ ,
W 2 = ( μ 1 E 1 2 Δ ω 1 ) 2 ( μ 2 E 2 ) 2 1 2 Δ ,

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