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The first scheme for quasi-phase-matching high harmonic generation ofcircularly polarized radiation is proposed: optical rotationquasi-phase-matching (ORQPM). In ORQPM propagation of the driving radiation ina system exhibiting circular birefringence causes its plane of polarization torotate; by appropriately matching the period of rotation to the coherencelength it is possible to avoid destructive interference of the generatedradiation. It is shown that ORQPM is approximately 5 times more efficient thanconventional QPM, and half as efficient as true phase-matching.

Optical Rotation Quasi-Phase-Matching for Circularly Polarized High Harmonic Generation