Abstract

Threshold powers for optical breakdown (OB) and supercontinuum (SC) generation in high-pressure CO2 gas have been measured at different focusing conditions. It has been found that by varying the focal length of the focusing lens, it is possible to pass from the case of OB without SC generation, through OB with SC generation, and into SC without OB. The experimental results demonstrate that plasma formation is not an essential mechanism for SC generation, whereas self-focusing causes SC generation characteristics to be dependent on conditions of external focusing.

© 1993 Optical Society of America

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References

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1992 (1)

V. François, F. A. Ilkov, S. L. Chin, J. Phys. B 25, 2709 (1992).
[Crossref]

1989 (1)

P. B. Corkum, C. Rolland, IEEE J. Quantum Electron. 25, 2634 (1989).
[Crossref]

1986 (2)

P. B. Corkum, C. Rolland, T. Srinavasan-Rao, Phys. Rev. Lett. 57, 2268 (1986).
[Crossref] [PubMed]

J. J. Glownia, J. Misewich, P. P. Sorokin, J. Opt. Soc. Am. B 3, 1573 (1986).
[Crossref]

1984 (1)

1977 (1)

W. L. Smith, P. Lui, N. Bloembergen, Phys. Rev. 15, 2396 (1977).
[Crossref]

1975 (1)

J. H. Marburger, Prog. Quantum Electron. 4, 35 (1975).
[Crossref]

1973 (1)

N. Bloembergen, Opt. Commun. 8, 285 (1973).
[Crossref]

1970 (1)

R. R. Alfano, S. L. Shapiro, Phys. Rev. Lett. 24, 592 (1970).
[Crossref]

1969 (1)

J. F. Ward, G. H. C. New, Phys. Rev. A 185, 57 (1969).

Alfano, R. R.

R. R. Alfano, S. L. Shapiro, Phys. Rev. Lett. 24, 592 (1970).
[Crossref]

Bloembergen, N.

W. L. Smith, P. Lui, N. Bloembergen, Phys. Rev. 15, 2396 (1977).
[Crossref]

N. Bloembergen, Opt. Commun. 8, 285 (1973).
[Crossref]

Chin, S. L.

V. François, F. A. Ilkov, S. L. Chin, J. Phys. B 25, 2709 (1992).
[Crossref]

Corkum, P. B.

P. B. Corkum, C. Rolland, IEEE J. Quantum Electron. 25, 2634 (1989).
[Crossref]

P. B. Corkum, C. Rolland, T. Srinavasan-Rao, Phys. Rev. Lett. 57, 2268 (1986).
[Crossref] [PubMed]

François, V.

V. François, F. A. Ilkov, S. L. Chin, J. Phys. B 25, 2709 (1992).
[Crossref]

Glownia, J. J.

Ilkov, F. A.

V. François, F. A. Ilkov, S. L. Chin, J. Phys. B 25, 2709 (1992).
[Crossref]

Lui, P.

W. L. Smith, P. Lui, N. Bloembergen, Phys. Rev. 15, 2396 (1977).
[Crossref]

Marburger, J. H.

J. H. Marburger, Prog. Quantum Electron. 4, 35 (1975).
[Crossref]

Misewich, J.

New, G. H. C.

J. F. Ward, G. H. C. New, Phys. Rev. A 185, 57 (1969).

Rolland, C.

P. B. Corkum, C. Rolland, IEEE J. Quantum Electron. 25, 2634 (1989).
[Crossref]

P. B. Corkum, C. Rolland, T. Srinavasan-Rao, Phys. Rev. Lett. 57, 2268 (1986).
[Crossref] [PubMed]

Shapiro, S. L.

R. R. Alfano, S. L. Shapiro, Phys. Rev. Lett. 24, 592 (1970).
[Crossref]

Shen, Y. R.

Smith, W. L.

W. L. Smith, P. Lui, N. Bloembergen, Phys. Rev. 15, 2396 (1977).
[Crossref]

Sorokin, P. P.

Srinavasan-Rao, T.

P. B. Corkum, C. Rolland, T. Srinavasan-Rao, Phys. Rev. Lett. 57, 2268 (1986).
[Crossref] [PubMed]

Ward, J. F.

J. F. Ward, G. H. C. New, Phys. Rev. A 185, 57 (1969).

Yang, G.

IEEE J. Quantum Electron. (1)

P. B. Corkum, C. Rolland, IEEE J. Quantum Electron. 25, 2634 (1989).
[Crossref]

J. Opt. Soc. Am. B (1)

J. Phys. B (1)

V. François, F. A. Ilkov, S. L. Chin, J. Phys. B 25, 2709 (1992).
[Crossref]

Opt. Commun. (1)

N. Bloembergen, Opt. Commun. 8, 285 (1973).
[Crossref]

Opt. Lett. (1)

Phys. Rev. (1)

W. L. Smith, P. Lui, N. Bloembergen, Phys. Rev. 15, 2396 (1977).
[Crossref]

Phys. Rev. A (1)

J. F. Ward, G. H. C. New, Phys. Rev. A 185, 57 (1969).

Phys. Rev. Lett. (2)

R. R. Alfano, S. L. Shapiro, Phys. Rev. Lett. 24, 592 (1970).
[Crossref]

P. B. Corkum, C. Rolland, T. Srinavasan-Rao, Phys. Rev. Lett. 57, 2268 (1986).
[Crossref] [PubMed]

Prog. Quantum Electron. (1)

J. H. Marburger, Prog. Quantum Electron. 4, 35 (1975).
[Crossref]

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Figures (3)

Fig. 1
Fig. 1

Dependence of relative spectral broadening Δω/ω0 and absolute broadening Δω versus laser power at 35-atm gas pressure. The dotted curve is the spline fit of the experimental points.

Fig. 2
Fig. 2

Dependence of the threshold power versus focal length of the focusing lens at 20-atm CO2 gas pressure. Circles, OB thresholds; squares, SC thresholds.

Fig. 3
Fig. 3

Dependence of the threshold power ratio for OB and SC on focal length. Triangles, data from Ref. 6 for water; squares, data for CO2 gas.

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