Used in atomic physics and quantum optics experiments as a vapor cell medium for laser cooling and trapping of cesium atoms. Employed in frequency standards and atomic clocks due to the precise hyperfine transition of cesium, enabling high-accuracy timekeeping. Applied in photoelectric cells and infrared detectors because of cesium's low ionization potential and high photosensitivity. Also utilized in drilling fluids in the oil and gas industry, particularly in the form of cesium formate, for its high density and stability under extreme conditions.