Fig. 1. Relationship between the refractive Index of BBO crystals and wavelength in the visible infrared band

Fig. 2. Relationship between the absorption coefficient of BBO crystals and wavelength

Fig. 3. Frequency response curves of EOS for BBO crystals with different thicknesses at 800 nm probe laser

Fig. 4. (a) Frequency spectra and (b) time domain waveforms before and after EOS detection with an input laser wavelength of 0.9 μm

Fig. 5. (a) frequency spectra and (b) time domain waveforms before and after EOS detection with an input wavelength of 1.5 μm

Fig. 6. (a) Frequency spectra and (b) time domain waveforms before and after EOS detection with an input wavelength of 2 μm

Fig. 7. (a) Bandwidth change percentage and (b) central frequency offset percentage generated by short period laser pulses in the range of 0.9‒2.1 μm passing through BBO crystals of different thicknesses