Abstract
The thermal contribution to the nonlinear refractive index of air at was measured with a high-finesse Fabry–Perot cavity and a 500-mW cw laser beam. At room temperature and pressure, the nonlinear refractive-index coefficient of air was found to be for a beam waist radius of 0.23 mm and was found to be independent of the relative humidity. The thermal nonlinearities of , , and were also measured, and it was found that the dominant contribution to air is its content.
© 2000 Optical Society of America
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