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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Vol. 7, Iss. 1 — Jan. 1, 1990
  • pp: 84–89

Two-photon spectroscopy of silicon using femtosecond pulses at above-gap frequencies

D. H. Reitze, T. R. Zhang, Wm. M. Wood, and M. C. Downer  »View Author Affiliations


JOSA B, Vol. 7, Issue 1, pp. 84-89 (1990)
http://dx.doi.org/10.1364/JOSAB.7.000084


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Abstract

Measurement of femtosecond single-pulse and time-resolved absorbance in an optically thin silicon film is used to extract the direct two-photon absorption (TPA) coefficient βTPA of silicon over a wide spectral range; it is also used to distinguish other nonlinear absorption channels, even with the fundamental pulse far above the indirect gap. We find that βTPA varies as follows: 15 cm/GW < βTPA < 36 cm/GW ± 6 cm/GW over the two-photon energy range 4.0 eV < 2 < 4.5 eV, consistent with available calculated values. The spectral structure of the results is related to the underlying band structure. The results show that second-order absorption nonlinearities dominate for fluences up to 0.07 J/cm2, just below the single-shot melting threshold. At fluences above this level a much stronger nonlinearity dominates.

© 1990 Optical Society of America

History
Original Manuscript: July 27, 1989
Revised Manuscript: September 22, 1989
Published: January 1, 1990

Citation
D. H. Reitze, T. R. Zhang, Wm. M. Wood, and M. C. Downer, "Two-photon spectroscopy of silicon using femtosecond pulses at above-gap frequencies," J. Opt. Soc. Am. B 7, 84-89 (1990)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-7-1-84

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