− | The laser used must have a wavelength greater than the maximum expected thickness of the diamond. Because the diamond should be, at its thickest, roughly 50 angstroms (50,000 nm) thick, we need light with a wavelength of more than 50,000 nm. Since the wavelength of visible light peaks at less than 800 nm, we will need to use extreme infrared light. | + | The laser used must have a wavelength greater than the maximum expected defect of the diamond. Because any defects will be extremely small (on the order of one micron thick), we need light with a wavelength of around 500 nm. We could use either a green or red laser. |