15 December 2000 Periodically poled lithium niobate by electron beam: irradiation conditions and second harmonic generation
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Proceedings Volume 4087, Applications of Photonic Technology 4; (2000) https://doi.org/10.1117/12.406455
Event: 2000 International Conference on Application of Photonic Technology (ICAPT 2000), 2000, Quebec City, Canada
Abstract
Second Harmonic Generation (SHG) using counter-propagating Quasi Phase Matching (QPM) configuration often requires a fine non-linearity with a period of a fraction of a micrometer. The direct Electron Beam (EB) domain reversal technique seems to be promising to achieve gratings on LiNbO3 with such a small period compared to other current poling technologies as it is lithographic free and exhibits a very high theoretical resolution (5 mm). We present here, a preliminary study concerning the influence of EB irradiation conditions on domain inversion; SHG is also examined on a 6.58 j.tm inverted periodic domain grating in lithium niobate using a Nd-YaG laser light. It is well known that LiNbO3 is an attractive material for many optical applications because of its transparency over a large wavelength band (350 mm to 5000 mm) and its high nonlinear coefficients. EB irradiation is performed using a Scanning Electron Microscope (SEM) driven by a Computer Aided Design (CAD) application developed in our laboratory. Various structures such as periodic gratings can be written with the chosen period. The ferroelectric domain inversion is investigated as a function of the accelerating voltage of the electrons (10 to 30 kV), the scanning speed of the EB (0.97 to 7.76 mm/s) and the current received by the sample (1.6 to 14 nA). The inversion patterns have been revealed by chemical etching (HF) and they have been observed using SEM. It has been shown that the duty cycle is respected on the irradiated face. The SHG conversion efficiency is measured as a function of the temperature and the grating period is calculated (value of6.564 jim).
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C. Restoin, C. Restoin, Vincent Couderc, Vincent Couderc, Claire Darraud-Taupiac, Claire Darraud-Taupiac, J.-Louis Decossas, J.-Louis Decossas, J.-C. Vareille, J.-C. Vareille, Alain Barthelemy, Alain Barthelemy, Jerome Hauden, Jerome Hauden, "Periodically poled lithium niobate by electron beam: irradiation conditions and second harmonic generation", Proc. SPIE 4087, Applications of Photonic Technology 4, (15 December 2000); doi: 10.1117/12.406455; https://doi.org/10.1117/12.406455
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