Fig. 3

a Differential absorption of the as-grown β-Ga₂O₃ NWs versus optical delay using λ _E  = 266 nm and λ _p  = 340 to 850 nm. The diagram shows the various processes following the photo-excitation of the β-Ga₂O₃ NWs; inset shows traces for λ _p >500 nm on an expanded scale (the same units). b Differential absorption measurements with λ _p  = 340 nm in β-Ga₂O₃ NWs for a range of fluences. The inset shows the normalized differential absorption for comparison