Abstract
Traditional optomechanical research is rarely studied in compound glass, especially chalcogenide glass. In this paper, the forward and backward Stimulated Brillouin Scattering (SBS) is demonstrated for the first time in a chalcogenide glass microsphere resonator. A high-purity chalcogenide glass microsphere with a high quality (<i>Q</i>) factor of 2.1 × 10<sup>7</sup> is investigated using a 1550 nm tunable laser. In the experiment, the resulting mechanical vibration frequencies caused by forward and backward SBS are measured at 80 MHz and 7.8 GHz, respectively. The triply resonant Stimulated Brillouin scattering process greatly enhances the light–acoustic interactions, enabling the threshold power to be 344 μW. The work demonstrated in the chalcogenide microresonator is important for the potential applications of chalcogenide glass, which has higher nonlinearity and low absorptions at mid-infrared band.
Highlights
Stimulated Brillouin scattering (SBS) is a non-linear acoustic/optical phenomenon resulting from the interaction between an electromagnetic wave and a mechanical wave, first proposed by Brillouin in 1922 [1]
SBS is widely used in ultra-narrow linewidth lasers, distributed sensors, optical amplifiers, optical cooling, slow light, optical isolator, nonreciprocal optics and optical phase conjugation [2,3,4,5,6,7,8,9,10,11]
SBS has been realized in optical microresonators, such as silica microspheres, disks, microbottles, crystalline cylinders and nanoparticles [7, 12,13,14,15,16], in which the optical and acoustic waves circulate along the equatorial surface, forming optical and mechanical whisperinggallery modes (WGMs) with ultrahigh quality (Q) factors
Summary
Stimulated Brillouin scattering (SBS) is a non-linear acoustic/optical phenomenon resulting from the interaction between an electromagnetic (optical) wave and a mechanical (acoustic) wave, first proposed by Brillouin in 1922 [1]. Chalcogenides are mainly composed of group VIA elements (excluding oxygen) in the periodic table, which results in their unique property of relatively high transmission in the infrared region, as well as suitability to form integrated waveguide optics and optical fibers in this spectral region [22, 23] Their phonon energy is extremely low compared to quartz, facilitating relatively easy fabrication of mid-infrared lasers, generally achieved by doping the chalcogenide glass with rare earth ions [21]. The threshold power of the backward SBS was measured to be as low as 344 μW This optomechanical phenomenon in chalcogenide microspheres can be exploited to realize nonreciprocal photonics devices, light storage, wavelength conversion, especially in the mid-infrared region, analogue to electro-optics and optomechanical systems [8, 9, 18, 27, 28]
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