Nonlinear refractive beam shaping by an organic nonlinear absorber

Robertson, John; Smith, Andrew; Duignan, Jason; Milsom, Philip; Bourhill, Grant
February 2001
Applied Physics Letters;2/26/2001, Vol. 78 Issue 9, p1183
Academic Journal
The response of organic dyes to laser pulses is typically described solely by nonlinear absorption. Recently, spatial profiles of a nanosecond pulse exiting an organic nonlinear absorber have shown energy redistribution from a Gaussian input profile to a central spike and outer ring. It was suggested that the spike and ring resulted from both nonlinear absorption and nonlinear refraction. In this letter, the role of a thermal nonlinear refraction in beam shaping is demonstrated using single and time-delayed double picosecond pulses. It is concluded that the dynamics of nonlinear absorption and nonlinear refraction must be included to correctly describe the laser-material interaction. © 2001 American Institute of Physics.


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