title: Stimulated rotational Raman scattering in nitrogen in long air paths.
abstract: 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.
authors.forename: M A
authors.initials: MA
authors.lastname: Henesian
authors.forename: C D
authors.initials: CD
authors.lastname: Swift
authors.forename: J R
authors.initials: JR
authors.lastname: Murray