Principles of Raman lasers and parametric amplifiers

Jha, Sudhanshu S. (1971) Principles of Raman lasers and parametric amplifiers Proceedings of the Indian National Science Academy - Part A: Physical Sciences, 37A (3). pp. 219-227. ISSN 0073-6767

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With the advent of powerful lasers at selected frequencies, it has now become possible to generate new frequencies by stimulating Raman scattered waves of these light sources. In a medium with high second-order non-linear optical susceptibility, new frequencies are also generated by parametric conversion. Principles of stimulated Raman scattering and the three-wave parametric interaction in a non-linear medium are presented and compared with the physical process involved in the operation of a conventional laser. As two recent examples of tunable devices based on these principles, the case of lithium niobate (LiNbO3), where a polariton mode is excited, and the case of n-type InSb in a magnetic field, where an electron is excited to an empty spin-level, are discussed. The device using LiNbOs crystal is capable of generating tunable infra-red sources from 50 fl to 250 µ whereas lnSb device can generate tunable sources in the range 6-13 µ.

Item Type:Article
Source:Copyright of this article belongs to Indian National Science Academy.
ID Code:66526
Deposited On:24 Oct 2011 09:06
Last Modified:18 May 2016 14:01

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