We discovered strong interband two-photon absorption in one-dimensional cuprate using sub-picosecond pump-probe measurements in near- and mid-infrared region. The enhanced half-gap nonlinearity comes from the strong dipole coupling between exited states of different parity.
© 2002 Optical Society of America
M. Ashida, S. Uchida, Y. Tokura, and M. Kuwata-Gonokami, " Enhanced half-gap nonlinearity in one-dimensional cuprate," in Nonlinear Optics: Materials, Fundamentals and Applications, A. Sawchuk, ed., Vol. 79 of OSA Trends in Optics and Photonics (Optical Society of America, 2002), paper WC3.
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