Changing the color of laser light on the femtosecond time scale

Using femtosecond visible and terahertz (THz) pulses as external perturbations, scientists have investigated the second harmonic generation effect in photoexcited BiCoO3. Driven by the THz pulse, this research highlights the importance of orbital excitation in the Co3+ ion and provides clues for improving the performance of nonlinear optical phenomena in nonlinear crystals on the femtosecond time scale.

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