Strong optoacoustic interaction in hot CS2-filled liquid-core optical fiber

Optical fibers with a liquid core provide a versatile platform for nonlinear optics [1] . Filled with carbon disulfide (CS 2 ), the high linear refractive index of 1.59 at 1549 nm and low speed of sound of 1250 ms −1 , compared to silica, ensures guidance of optical and acoustic waves inside the fiber core. This type of fiber also provides a large optoacoustic interaction via stimulated Brillouin scattering (SBS) [2] due to the high optical nonlinearity of CS 2 , as well as the long interaction length and the low optical loss.