Abstract

Suppression of the multiphoton fluorescence contribution to the hyper-Rayleigh (second-order nonlinear optical) scattering signal was recently achieved by intrinsic demodulation of the fluorescence at high amplitude-modulation (AM) frequencies [Olbrechts et al., Rev.  Sci.  Instrum.  69, 2233 (1998)]. These high AM frequencies were obtained from the high harmonic content in the Fourier spectrum of a repetitive train of femtosecond pulses from a Ti:sapphire laser emitting at 800  nm. We have used a femtosecond parametric oscillator to shift the fundamental wavelength to 1.3 μm. By further improving the detection electronics, we can now obtain fluorescence suppression at AM frequencies up to 600  MHz. Fluorescence-free hyperpolarizability values were obtained for fluorescent dipolar compounds as well as for an ionic fluorophore. The results also indicate that shifting the fundamental wavelength to the near infrared only is not a general solution to the multiphoton fluorescence problem in hyper-Rayleigh scattering.

© 1999 Optical Society of America

Full Article  |  PDF Article
Related Articles
Fourier analysis of the femtosecond hyper-Rayleigh scattering signal from ionic fluorescent hemicyanine dyes

Koen Clays, Kurt Wostyn, Geert Olbrechts, André Persoons, Akira Watanabe, Kyoko Nogi, Xuan-Ming Duan, Shuji Okada, Hidetoshi Oikawa, Hachiro Nakanishi, Henryk Vogel, David Beljonne, and Jean-Luc Brédas
J. Opt. Soc. Am. B 17(2) 256-265 (2000)

Study of domain formation and relaxation in thin polymeric films by femtosecond hyper-Rayleigh scattering

Geert Olbrechts, Erik J. H. Put, David Van Steenwinckel, Koen Clays, André Persoons, Celest Samyn, and Naoki Matsuda
J. Opt. Soc. Am. B 15(1) 369-378 (1998)

Spectral content and dispersion of hyper-Rayleigh scattering

S. F. Hubbard, R. G. Petschek, and K. D. Singer
Opt. Lett. 21(21) 1774-1776 (1996)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (2)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription