Direct measurement of the group refractive index of air with interferometry between adjacent femtosecond pulses |
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Authors: | Yamaoka Yoshihisa Minoshima Kaoru Matsumoto Hirokazu |
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Affiliation: | National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan. y-yamaoka@aist.go.jp |
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Abstract: | The group refractive index of air in laboratory conditions is measured directly between adjacent femtosecond laser pulses by a new interferometry technique. Measurement of the repetition rate of the mode-locked pulse train that gives the maximum amplitude of the interference-signal envelope enables us to determine the group refractive index of air within a standard deviation of 2 x 10(-7). This simple method without vacuum reference is attractive for measuring the group refractive index needed for precise distance measurements in open fields. |
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