NONLINEAR ABSORPTION OF A TRANSVERSELY EXCITED ATMOSPHERE CO2-LASER BEAM IN CF3 BR MOLECULES AND MEASUREMENT OF THE NONLINEAR REFRACTIVE-INDEX COEFFICIENT

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We investigate self-focusing and self-defocusing of a transversely excited atmosphere CO2 laser pulse (1.3 MW) in the medium of CF3Br molecules. Self-focusing of the 9R(30) line and self-defocusing of the 9R(26) and 9R(28) lines are observed. Nonlinear absorption cross sections (sigma) are first measured for various fluences of the laser beam to permit us to obtain an accurate expression for the nonlinear absorption coefficient alpha. The beam-narrowing effect of the nonlinear absorption (alpha) modifies the far-field spatial profile of the beam. Finally, from the distorted profile we derive the nonlinear refractive-index coefficient n2 with an improved accuracy. The nonlinear refractive-index coefficients for the three lines are -7.9 +/- 0.6 x 10(-13) cm2/(W Torr) for 9R(26), -3.7 +/- 0.5 X 10(-13) cm2/(W Torr) for 9R(28), and 4.9 +/- 0.4 X 10(-12) cm2/(W Torr) for 9R(30).
Publisher
OPTICAL SOC AMER
Issue Date
1993-08
Language
English
Article Type
Article
Keywords

MULTI-PHOTON ABSORPTION; CO2-LASER RADIATION; N2 MEASUREMENTS; NH3 GAS; SELF; PULSE; SF6; CS2

Citation

JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, v.10, no.8, pp.1360 - 1364

ISSN
0740-3224
DOI
10.1364/JOSAB.10.001360
URI
http://hdl.handle.net/10203/55882
Appears in Collection
PH-Journal Papers(저널논문)
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