Stimulated rotational Raman scattering in nitrogen in long air paths

We studied the growth from amplified spontaneous emission of stimulated Raman scattering in air using a 20-cm-diameter, linearly polarized, 1053-nm laser beam propagating over a 20-150-in air path. For 2.5-nsec square pulses we found about 1% conversion on the S(8) and S(10) rotational Raman lines o...

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Bibliographic Details
Published in:Optics letters 1985-11, Vol.10 (11), p.565-567
Main Authors: HENESIAN, M. A, SWIFT, C. D, MURRAY, J. R
Format: Article
Language:English
Subjects:
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Nonlinear optics
Optics
Physics
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Summary:We studied the growth from amplified spontaneous emission of stimulated Raman scattering in air using a 20-cm-diameter, linearly polarized, 1053-nm laser beam propagating over a 20-150-in air path. For 2.5-nsec square pulses we found about 1% conversion on the S(8) and S(10) rotational Raman lines of nitrogen at an intensity-length product of 12 TW/cm, which implies a small-signal gain coefficient of 2.5 cm/TW. For 1-nsec square pulses, 1% conversion requires an intensity-length product of about 16 TW/cm. The beam quality deteriorates severely above Raman threshold.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.10.000565