Nonlinear spectrometry of chromophores for optical limiting

David J. Hagan; Edward J. Miesak; Raluca A. Negres; Sean Ross; Jin Hong Lim; Eric W. Van Stryland; Arthur Dogariu

doi:10.1117/12.326875

12 October 1998 Nonlinear spectrometry of chromophores for optical limiting

David J. Hagan, Edward J. Miesak, Raluca A. Negres, Sean Ross, Jin Hong Lim, Eric W. Van Stryland, Arthur Dogariu

Proceedings Volume 3472, Nonlinear Optical Liquids for Power Limiting and Imaging; (1998) https://doi.org/10.1117/12.326875
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

We describe two methods for the spectral measurement of nonlinear absorption and refraction in reverse-saturable absorber materials. In the first, we use a picosecond optical parametric oscillator to perform Z-scan at many different wavelengths to measure excited state refraction and absorption cross sections throughout the visible. The second methods uses a chirped-pulse amplification scheme to produce 100 fs pulses at 840 nm. Focusing these into sapphire generates a white light continuum that is used as a probe in an excite-probe experiment. The excitation beam is derived from the second harmonic of the remaining 840 nm light. By measurement of the transmission spectrum of the probe as a function of excite- probe delay time, we can determine the spectral dependence of the excited-state absorption cross section. Moreover, by use of Kramers-Kronig relations, the excited state refraction can also be extracted from this data. We describe our measurements using both methods in a Zn:tetrabenzporphyrine derivative (TBP). The fact that both methods give excellent agreement not only verifies the utility of continuum measurements, but also reveals some interesting properties of the excited states of TBP.

Citation Download Citation

David J. Hagan, Edward J. Miesak, Raluca A. Negres, Sean Ross, Jin Hong Lim, Eric W. Van Stryland, and Arthur Dogariu "Nonlinear spectrometry of chromophores for optical limiting", Proc. SPIE 3472, Nonlinear Optical Liquids for Power Limiting and Imaging, (12 October 1998); https://doi.org/10.1117/12.326875

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