DIFF Subgroup
G02F 1/37 for second-harmonic generation
Introduced: July 1974
Full Title
Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics > Non-linear optics > for second-harmonic generation
CPC subdivides this area 3x more granularly than IPC with 2 additional codes.
2 codes are CPC-only extensions.
IPC defines codes here since 2000.
Child Classifications
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