Optoacoustic properties of thallium arsenic sulphide, Tl3AsS4

We report on the growth and the measurement of optical and optoacoustic properties of Tl3AsS4, a new single‐crystal sulfosalt material. It is transparent from 0.6 to 12 μm, has an optoacoustic figure of merit (relative to fused silica) of over 500 (at 0.6328 μm), and rather low acoustic losses.