Abstract
A new method for separating linear and circular parts in the photogalvanic effect is proposed. This method utilizes an optical phase plate which is inserted between a sample and a phase-modulator crystal. We successfully applied the method to determine the linear photogalvanic coefficient β36 and circular coefficient γ33 of Bi12SiO20 and γ33 of Pb5Ge3O11. In particular, the change of the sign of γ33 of Pb5Ge3O11 was observed by reversing the spontaneous polarization. This phenomenon originates from the fact that the ferroelectric 180° domains of Pb5Ge3O11 are related by mirror symmetry.
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