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What are the main bases of nonlinear optical materials?

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The main basis of choosing nonlinear optical materials is as follows: (1) there is a large nonlinear polarizability. This is the basic, but not the only requirement. Because the laser power can reach a very high level, even if the nonlinear susceptibility is not large, nonlinear optical effects can also be enhanced to get through the enhancement of incident laser power to the appropriate degree of transparency; and adequate optical homogeneity, which is in the laser working band, absorption and scattering of harmful the loss of material of light is very small; the can in a certain way to achieve phase matching (see optical phase conjugation); the high damage threshold of material, can withstand greater laser power or energy; there is the appropriate response time, respectively for different pulse width laser pulse or continuous laser to make enough response.

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