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Coupling between ultrafast lattice dynamics and electronic polarization becomes increasingly important for generating terahertz frequency combs, monitor atomic potential landscapes, or high-speed information processing. Here, we show that the carrier population excited by multiphoton (5-photon) absorption in diamond crystal can be controlled at terahertz frequencies by coherent lattice vibrations-phonons. We introduce and compare two independent methods for direct monitoring of coherent phonon dynamics in diamond by using photoluminescence or photocurrent measurements on femtosecond time scale. We observe a strong signal enhancement compared to standard techniques due to transmission geometry and high-order nonlinearity of optical carrier generation.

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