Supercontinuum generation in macromolecular media.

Santhosh, C and Dharmadhikari, AK and Dharmadhikari, JA and Alti, Kamlesh and Mathur, D (2010) Supercontinuum generation in macromolecular media. Appl Phys B, 99. pp. 427-432.

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The interaction of intense, ultrashort (femtosecond) pulses of infrared light with water leads to the generation of a white light supercontinuum due to nonlinear optical effects. This supercontinuum extends over the wavelength range 400–900 nm. The blue-sided components of this supercontinuum are due to laser-induced plasma effects and are found to sensitively depend on the presence in water of minute quantities of protein dopants (dilutions of 0.025%– 0.1%). Salivary proteins like mucin and immunoglobulin-A lead to pronounced suppression of the blue-sided components, while proteins found in blood serum, such as transferrin, immunoglobulin G (IgG) and human serum albumin (HSA), do not show any such suppression. It is postulated that major salivary proteins have a propensity to efficiently scavenge plasma electrons and thereby extinguish the plasma that is formed upon laser irradiation.

Item Type: Article
Subjects: Departments at MU > Atomic Molecular Physics
Depositing User: KMC Manipal
Date Deposited: 07 Oct 2011 04:25
Last Modified: 07 Oct 2011 04:25

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