HOW MUCH YOU NEED TO EXPECT YOU'LL PAY FOR A GOOD IR OPTICAL

 5a]. The absorption edge for samples VT400 and VT700 occurred at ~ 503 nm and ~ 470 nm. Conversely, the transmittance decreased a bit with raising substrate temperature while in the NIR spectra assortment, which might be attributed to the big particle size and deficiency of porosity for VT700. Figure 5b shows the reflectance spectra fo