Contact Grating Device With Fabry-Perot Resonator Toward Intense Thz Pulse Generation By Optical Rectification

A novel design for a contact grating device with an incorporated Fabry Perot resonator is proposed for high-power terahertz light (THz) generation. We deposited a multilayer consisting of Ta2O5 and Al2O3 on a magnesium-doped stoichiometric LiNbO3 substrate and fabricated grating grooves on the outermost layer. The multilayer was designed such that conditions for a Fabry Perot resonator were satisfied for light diffracted by the grating. Consequently, the diffraction efficiency was enhanced by the resonator. The diffraction efficiency of the fabricated device was 7%. THz light generation was also demonstrated with the contact grating device.