High-performance acousto-optic modulator based on environmentally favorable Ge20Sb15Se65 chalcogenide glass

High‐Quality Acousto‐Optic Modulators with High Diffraction Efficiency, Polarization Extinction Ratio, and Small Insertion Loss Based on a Novel BaO–TeO2–WO3 Glass

“…The sound and light surfaces of the BTW glass AO medium were finely polished, and the light surfaces were high-transmittance (HT) coated at 1064 and 808 nm (T > 99%). Figure 4b exhibits the finely cut and coated Quartz glass [ 18,19] 0.19-3.7 1.4@1.06 μm 1 5960 75%@1.06 μm Ge 20 Sb 15 Se 65 glass [23] 0.8-10 2.6@1.55 μm / 2360 73%@1.55 μm BTW glass 0.43-5.3 2.1@1.06 μm 0.95 3422 85%@1.06 μm BTW glass, whose transmittance curve is shown in Figure S5, Supporting Information. The photograph of the BTW glass free-spaced AOM is shown in Figure 4c.…”

“…Ge 20 Sb 15 Se 65 is a new AO glass reported in 2021, which has an ultrahigh refractive index that can promote excellent AO properties, but its sound velocity and transmittance (55%) are too low. [23] TeO 2 crystal and quartz glass are widely used commercial AO materials. Compared with quartz glass, BTW glass and TeO 2 crystal have a wider transmission band and a larger refractive index.…”

“…Recently, a series of chalcogenide glasses with large refractive indices have been reported, which exhibit excellent AO figures of merit and wide infrared cut-off edges. [21][22][23][24] More importantly, they do not contain toxic elements that are harmful to human health. However, the transmittance of chalcogenide glasses in the visible and near-infrared bands is not ideal, and it is more suitable for far-infrared bands.…”

Interstitial doping of Mn4+ ions: An effective method to optimize the optical properties of TeO2 single crystal

“…1 In general, the efficiency of the AO device is mainly determined by the inherent transparency and refractive index of the AO material. 2 On the one hand, the great transparency ensures that the laser can pass through the AO devices with a low optical loss. On the other hand, a high refractive index could lead high value of the AO figure of merit (M 2 ), 3 which is important for increasing the diffraction efficiency of AO devices.…”

“…For decades, the acousto‐optic (AO) devices, which are based on the AO modulation technology, have been widely used in military and civilian fields due to their compact structure, fast response, and good modulation effect 1 . In general, the efficiency of the AO device is mainly determined by the inherent transparency and refractive index of the AO material 2 . On the one hand, the great transparency ensures that the laser can pass through the AO devices with a low optical loss.…”