Caesium bromide (CsBr) is used in infrared spectroscopy as a transparent window material due to its high transmittance in the infrared range (up to 50 µm). It is commonly employed in optical components such as lenses, prisms, and beamsplitters for IR instruments. As a scintillation agent, it emits light upon exposure to gamma or X-rays, making it suitable for radiation detection devices in medical imaging, material inspection, and nuclear applications. It is also utilized in certain ion-selective electrodes and in research for crystal growth, solid-state physics, and high-refractive-index materials in photonics and laser optics.