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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Vol. 16, Iss. 11 — Nov. 1, 1999
  • pp: 1988–1994

Two-photon excitation cross section of the BX(0,0) band of CO measured by direct absorption

Michael D. Di Rosa and Roger L. Farrow  »View Author Affiliations

JOSA B, Vol. 16, Issue 11, pp. 1988-1994 (1999)

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We report new measurements of the two-photon absorption rate in the B←X(0,0) band of CO, as determined from absorption spectra obtained with Fourier-transform-limited pulses of well-characterized spatial profile. By comparing measured absorption spectra of the CO Q branch near 230 nm with a nonlinear model for the pulse attenuation, we derive the spectrally integrated cross section σ0(2). The space- and time-dependent model considers two-photon absorption followed by one-photon photoionization of the excited state. The Q-branch spectral profile is simulated with previously measured coefficients of collisional broadening and shift. Remarkably, for modest irradiances of 80–350 MW/cm2 at the focus, attenuations of 10% and greater at the Q-branch peak were observed in a single pass through neat CO at pressures of 12–33 kPa. Our result for the spectrally integrated cross section, averaged over five experiments, is σ0(2)=(1.5+0.7/−0.2)×10−35 cm4.

© 1999 Optical Society of America

OCIS Codes
(300.1030) Spectroscopy : Absorption
(300.6390) Spectroscopy : Spectroscopy, molecular
(300.6410) Spectroscopy : Spectroscopy, multiphoton
(300.6420) Spectroscopy : Spectroscopy, nonlinear
(300.6540) Spectroscopy : Spectroscopy, ultraviolet

Michael D. Di Rosa and Roger L. Farrow, "Two-photon excitation cross section of the BX(0,0) band of CO measured by direct absorption," J. Opt. Soc. Am. B 16, 1988-1994 (1999)

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