CsInGeSe4

CsInGeSe₄ is a quaternary semiconductor compound belonging to the chalcogenide family, combining cesium, indium, germanium, and selenium into a crystalline structure. This material is primarily of research interest for infrared optics and nonlinear optical applications, where its wide transparency window in the mid-to-far infrared region and potential nonlinear optical coefficients make it a candidate for specialized photonic devices. While not yet widely adopted in mainstream manufacturing, CsInGeSe₄ represents the broader class of complex chalcogenide semiconductors being investigated for advanced optical frequency conversion, infrared transmission windows, and quantum photonics where conventional materials like zinc selenide or gallium arsenide are insufficient.