Abstract
The formation of periodic domain structures in stoichiometric lithium niobate crystals via direct surface irradiation using a controllable electron beam in a scanning electron microscope is studied. The periodic domain structures are fabricated at different microscope parameters (current, voltage, charge density) and different ways of charge implantation. The irradiation modes for the formation of uniform periodic domain structures are experimentally found. The use of optimal electron-beam parameters and ways of crystal surface irradiation make it possible to fabricate domain structures with a period of 6.9 μm in a crystal 0.5 mm thick. Domain structures of this kind can be used for optical wavelength conversion by quasi-phase-matching and second harmonic generation in lithium niobate.
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