Dielectric Barrier Discharge (DBD) can generate uniform and high-energy density low-temperature plasma jet at atmospheric pressure, which is often called Atmospheric Pressure Plasma Jet (APPJ). APPJ has a variety of reactive oxygen species and nitrogen products and has important application prospects in surface treatment, biomedicine, food processing, and agriculture. In this paper, the gas temperature, electron excitation temperature, and electron density of helium atmospheric pressure plasma jet (He-APPJ) were diagnosed by Optical Emission Spectroscopy (OES). The experimental results show that the activated particles emitted by He-APPJ plasma contain OH, 𝑁𝑁2 +, Helium, Oxygen, and H at 5500V~6750V. At this high pressure, most gas temperatures remain below 400K, which can be deduced that the He plasma jet is a low-temperature plasma. The electron excitation temperature is around 2000K and the electron density reaches 1014cm-3. The higher the voltage, the higher the electron excitation temperature and electron density.
A novel silica-waveguide integrated acoustooptic frequency shifter (AOFS) with high diffraction efficiency is proposed
for an optical wavelength of 1.55μm in this paper. Choose tapered silica waveguides fabricated on silicon substrates by
PECVD and C-axis oriented ZnO piezoelectric films deposited using RF-sputtering as the interdigital transducer for the
excitation of SAW. The interdigital Al electrodes are located at the interface between the nonpiezoelectric substrates
(SiO2) and the ZnO piezoelectric films, that is, ZnO/IDT/SiO2 structure; when the ZnO films thickness h and SAW's
wavelength Λ satisfy the relation h/Λ=0.4~0.5, electromechanical coupling coefficient of the interdigital transducer
achieves the maximum value 17%. Diffraction properties are simulated and analyzed using beam propagation method
(BPM) and AO interaction area is well-designed in order to obtain optimum interaction characteristics. The results show
that a diffraction efficiency of approximately 70% can be obtained.
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