Acousto-Optic Properties of Germanium-, Selenium-, Silicon-, and Tellurium-Based Alloys

Acoustic and acousto-optic properties of Ge-=SUB=-a-=/SUB=-Se-=SUB=-b-=/SUB=-Te-=SUB=-c-=/SUB=- and Si-=SUB=-a-=/SUB=-Se-=SUB=-b-=/SUB=-Te-=SUB=-c-=/SUB=- glasses in case diffraction on longitudinal and shear acoustic waves

“…In this study the amorphous alloys or glasses based on germanium (Ge), selenium (Se), silicon (Si), and tellurium (Te) are investigated. The presented results continue and complete the series of studies [13,14]. The properties of shear acoustic waves in the glasses under consideration are experimentally investigated, and the AO quality factors M 2 are determined for the optical radiation diffraction with a wavelength of λ = 3.39 µm on a shear wave.…”

“…In this study we studied several glass samples consisting of three chemical elements: germanium (Ge), selenium (Se), and tellurium (Te), as well as one glass sample consisting of silicon (Si), selenium (Se) and tellurium (Te). Following the classification adopted earlier, we will call glasses consisting of germanium, selenium and tellurium belonging to the GeSeTe system, and glasses made of silicon, selenium and telluriumglasses from the SiSeTe [13,14] system. The general view of the glasses is shown in Fig.…”

“…The results of these measurements are shown in Table 1. Also, for comparison and completeness of the description of the physical properties of the alloys under consideration, Table 1 lists the values of the velocities of longitudinal acoustic waves already known from the literature [14,15]. It should be noted, that the presented values of shear acoustic wave velocities were measured by the echo-pulse method in all glasses.…”

Temperature Effects in an Acousto-Optic Modulator of Terahertz Radiation Based on Liquefied SF6 Gas

“…This makes it possible to improve the characteristics of these devices by several orders of magnitude in comparison with analogs based on optically isotropic media [ 6 , 7 ]. Unfortunately, in the terahertz (THz) range, birefringent crystals are practically opaque, while optically isotropic crystals (for example, germanium) feature a lower value of the AO figure of merit [ 8 ]. Therefore, studies of the AO effect in the THz range have not been carried out for many years and were considered unpromising.…”

Investigation of the acousto‐optical properties of Ge–As–Te–(Se) chalcogenide glasses at 10.6 μm wavelength

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Acousto-optic interactions based on the diffraction of light by acoustic waves have been widely applied to acousto-optic modulators, acousto-optic deflectors, and acousto-optic Q-switch since the advent of lasers. [1][2][3][4] Materials with high acousto-optic figures of merit have been employed to further improve the performance of various acousto-optic devices. Chalcogenide glasses are considered outstanding infrared acousto-optic media on account of their excellent infrared transparency and high figures of merit M 2 (M 2 = n 6 P 2 12 ∕ V 3 L ,where n denotes the refraction index, P 12 denotes the photoelastic coefficient, ρ is the material density, and V L is the ultrasonic wave velocity).

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