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Optics Letters

Optics Letters


  • Vol. 23, Iss. 8 — Apr. 15, 1998
  • pp: 624–626

Ultrashort dephasing-time measurements in Nile Blue polymer films

Carl H. Grossman and Julie J. Schwendiman  »View Author Affiliations

Optics Letters, Vol. 23, Issue 8, pp. 624-626 (1998)

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Optical dephasing measurements using degenerate four-wave mixing (DFWM) were performed on thin dye–polymer films at room temperature. Incoherent light centered at 575 nm was used as a source for ultrafast measurements on the blue side of the inhomogeneous distribution of the oxazine dye Nile Blue. Under these conditions, a new form of interference was observed as a sinusoidal variation of the DFWM signal versus delay time. A measured interference period of 1.96±0.07 fs corresponds to the optical cycle time of the light source. Numerical solutions for the DFWM intensity confirm the oscillation effect and estimate a measured dephasing time of 2–3 fs.

© 1998 Optical Society of America

OCIS Codes
(160.5470) Materials : Polymers
(190.4380) Nonlinear optics : Nonlinear optics, four-wave mixing
(260.3160) Physical optics : Interference
(310.6860) Thin films : Thin films, optical properties
(320.7100) Ultrafast optics : Ultrafast measurements
(320.7120) Ultrafast optics : Ultrafast phenomena

Carl H. Grossman and Julie J. Schwendiman, "Ultrashort dephasing-time measurements in Nile Blue polymer films," Opt. Lett. 23, 624-626 (1998)

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