Of the following lasers, which is matched with the correct wavelengh?
A. CO2 and 2940nmAlexandrite and 755nm. CO2 is 10,600, ER:YAG is an erbium yttrium aluminium garnet laser at 2940, KTP is potassium titanyl phosphate and is the frequency doubling crystal for Nd:YAG (neodynium YAG), hence halving the Nd:YAG wavelength of 1064 to 532.