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An Optical Paradox (1928)

PERRY, J. W.

[s.l.] : Nature Publishing Group

Nature 121 (1928), S. 749-749

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ISSN: 1476-4687

Source: Nature Archives 1869 - 2009

Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics

Notes: [Auszug] THE paradox propounded by Mr. T. Smith in NATURE of Feb. 25 lays emphasis upon an important aspect of physical measurement and demands explanation. The considerations recorded in NATURE of April 7, in the letters of Dr. Campbell and Mr. Smith, leave the question unsettled, and I venture to give ...

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1038/121749a0

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Direct measurements of nonlinear absorption and refraction in solutions of phthalocyanines (1992)

Wei, T. H. ; Hagan, D. J. ; Sence, M. J. ; [et al.]

Springer

Applied physics 54 (1992), S. 46-51

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ISSN: 1432-0649

Keywords: 33.00 ; 42.65 ; 42.80

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract We report direct measurements of the excited singlet state absorption cross section and the associated nonlinear refractive cross section using picosecond pulses at 532 nm in solutions of phthalocyanine and naphthalocyanine dyes. By monitoring the transmittance and far field spatial beam distortion for different pulsewidths in the picosecond regime, we determine that both the nonlinear absorption and refraction are fluence (energy per unit area) rather than irradiance dependent. Thus, excited state absorption (ESA) is the dominant nonlinear absorption process, and the observed nonlinear refraction is also due to real population excitation.