ATGS or L-α-Alanine doped TGS (Triglycine Sulphate) is a type of pyroelectric crystal that is formed by doping TGS crystal with L-α-Alanine. ATGS is used in various applications such as in the field of infrared detection, spectroscopy, and other sensing applications. ATGS crystals are known for their good pyroelectric properties, high stability, and high response speed, making them ideal for use in pyroelectric detectors and other related applications.