Explanation
Refers to a crystal with nonlinear optical effects. The crystal with this effect is mainly used for laser frequency doubling. In addition to meeting the general requirements of optical crystal, it also has the following characteristics: ① large nonlinear coefficient (because the frequency doubling efficiency is proportional to its square); ② Able to achieve phase matching; ③ Low absorption and scattering of incident light and frequency doubling light; ④ No light damage, etc. The main nonlinear optical crystal are barium sodium niobate α- Potassium iodate, etc.
Classification
Inorganic non-metallic materials -> Crystal growth and crystal materials