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A two-photon pumped polyfluorene laser
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Image of FIG. 1.

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FIG. 1.

(a) Linear absorption (solid line) and fluorescence (dashed line) of PFO along with two-photon fluorescence excitation spectra for both nanosecond (solid squares, solid line) and femtosecond (open circles, dashed line) pump pulses. (b) Energy dependence of PFO fluorescence in solution for 640 nm, 100 fs excitation. The solid line corresponds to a square dependence. The inset shows the chemical structure of PFO.

Image of FIG. 2.

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FIG. 2.

(a) Inverse transmission as a function of pump power density for a PFO solution under two-photon femtosecond illumination. The straight line is a linear fit based on Eq. (1). (b) Two-photon absorption coefficients across different pump wavelengths for both nanosecond (filled squares, solid line) and femtosecond (open circles, dashed line) pumpings of PFO solution.

Image of FIG. 3.

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FIG. 3.

Emission spectra of two-photon pumped PFO lasers (A: 442 nm, B: 447 nm, C: 450 nm, D: 452 nm, and E: 458 nm). Spectra D and E were measured using a higher resolution spectrometer.

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2009-06-24
2014-04-16

Abstract

A tunable two-photon pumped solid-state laser based on polyfluorene is reported. A detailed investigation of the two-photon absorption in polyfluorene for both nanosecond and femtosecond time regimes in solution, and solid-state allows the determination of the most favorable conditions for lasing. Tunable distributed feedback lasers are made by spin coating from a polyfluorene solution on corrugated silica substrates and lasing is achieved under two-photon excitation at 640 nm with an absorbed energy density at lasing threshold of . These results highlight an alternative pumping scheme for blue organic semiconductor lasers.

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Scitation: A two-photon pumped polyfluorene laser
http://aip.metastore.ingenta.com/content/aip/journal/apl/94/25/10.1063/1.3149827
10.1063/1.3149827
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