Nanoscale light-induced phase transformation in alpha-gallium as the source of a broadband optical nonlinearity

Autor:	R.J. Knize, Nikolay I. Zheludev, Vassili A. Fedotov, B.V. Zhdanov, Kevin F. MacDonald
Rok vydání:	2001
Předmět:	Materials science Optical fiber business.industry Phase (waves) Nonlinear optics chemistry.chemical_element Light scattering law.invention Wavelength Optics chemistry law Optical parametric oscillator Optoelectronics Gallium business Excitation
Zdroj:	Technical Digest. Summaries of papers presented at the Conference on Lasers and Electro-Optics. Postconference Technical Digest (IEEE Cat. No.01CH37170).
DOI:	10.1109/cleo.2001.947720
Popis:	Summary form only given. Using a tunable optical parametric oscillator we discovered that the interface between gallium and silica displays an exceptionally broadband nonlinearity. At temperatures several degrees below gallium's melting point (/spl sim/30/spl deg/C) the reflectivity increases by up to 40% in response to 3 ns excitation pulses at wavelengths from 440 to 700 nm. It is shown how the reflectivity change depends on the excitation fluence, and that it saturates at about 6 mJ/cm/sup 2/.
Databáze:	OpenAIRE
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