Abstract
AbstractIn contrast to conventional harmonic generation, realized using nonlinear crystal, the multiphoton‐excited (MPE) laser has critical applications in fluorescence imaging probe and biological photonics. Here, lasing emission from a crystal plate under 7‐photon excitation at room temperature is reported for the first time, which is the highest order MPE lasing reported up to date. Moreover, MPE lasing spikes and high‐order harmonic peaks are observed simultaneously. The saturation behavior of harmonic generation and abnormal fluorescence enhancement identify that the interaction of photon–electron in 7‐photon‐excited lasing transits from photon‐excited to a more field‐driven regime. The results may pave the way for short wavelength laser by taking advantage of the processability and larger scale of solid crystals.
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