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Proceedings Paper

Second-order cascaded frequency shifting and signal amplification in organic and inorganic crystals
Author(s): Gian Piero Banfi; P. K. Datta; Ilaria Cristiani; D. Fortusini; Vittorio Degiorgio; John N. Sherwood
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Paper Abstract

We report wavelength shifting (generation of a pulse at the wavelength (lambda) p - (Delta) (lambda) from a signal at (lambda) p + (Delta) (lambda) under the action of a pump at (lambda) p) and parametric amplification through a cascaded second order process in a periodically poled lithium niobate crystal and also in an organic crystal N-(4-nitrophenyl)-L- prolinol (NPP). NPP could convert signal pulse (from 1.16 to 1.14 micrometer) with unit gain under the action of a pump pulse (at 1.15 micrometer) of peak intensity as low as 9 MW/cm2. In the limit of negligible conversion, where the cascading effect can be described through an effective (chi) (3), we derive for NPP(chi) eff(3) approximately equals 2.4 X 10-17 m2/V2, which is approximately 102 larger than (chi) (3) of conjugated polymers or semiconductors. In a 19 mm long PPLN sample, at (lambda) p equals 1.8 micrometer and (Delta) (lambda) as large as 60 nm, we could obtain unit gain with a pump intensity of 6 MW/cm2, while amplification by a factor of 10 requires 18 MW/cm2. We also present a theoretical comparison between frequency mixing and cascading.

Paper Details

Date Published: 28 April 1999
PDF: 8 pages
Proc. SPIE 3666, International Conference on Fiber Optics and Photonics: Selected Papers from Photonics India '98, (28 April 1999); doi: 10.1117/12.347986
Show Author Affiliations
Gian Piero Banfi, INFM and Univ. degli Studi di Pavia (Italy)
P. K. Datta, INFM and Univ. degli Studi di Pavia (Italy)
Ilaria Cristiani, INFM and Univ. degli Studi di Pavia (Italy)
D. Fortusini, INFM and Univ. degli Studi di Pavia (Italy)
Vittorio Degiorgio, INFM and Univ. degli Studi di Pavia (Italy)
John N. Sherwood, Univ. of Strathclyde (United Kingdom)


Published in SPIE Proceedings Vol. 3666:
International Conference on Fiber Optics and Photonics: Selected Papers from Photonics India '98
Anurag Sharma; Banshi Dhar Gupta; Ajoy K. Ghatak, Editor(s)

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