Abstract
The non-zero non-linear susceptibility tensor components χστυ2ω (E0)which account for frequency doubling of laser light in a naturally isotropic medium immersed in a DC efectric field (E0) are discussed. The conditions for extremal second harmonic generation (SHG) are derived, which depend onE0 and on the incident laser intensity but primarily on the microstructure of the medium. With growingE0, the susceptibilities χστυ2ω (E0) increase for cigar-like microsystems but decrease for disc-shaped ones, according to whether the induced dipole helps or hinders the permanent dipole in reorienting the microsystem along (E0). Non-linear electronic distortion alone is insufficient for explaining the anomalous experimental results.
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