Ndyag Laser finds applications in various segments viz Automotive, Cavity Ring-Down Spectroscopy (CRDS), Dentistry, Fluid Dynamics, Laser Pumping, Laser-Induced Breakdown Spectroscopy (LIBS), Manufacturing, Medicine, Military and Defense. In medicine, Nd: YAG Laser Surgery is done with the use of a photocoagulation unit which controls chronic and acute GI hemorrhage. In ophthalmology, Nd:YAG Lasers are used for the correction of posterior capsular opacification. This condition is normally seen after the cataract surgery. Patients suffering from acute angle-closure glaucoma have been benefited with Nd:YAG lasers, with peripheral iridotomy being done on them. Patients facing the problem of diabetic retinopathy, Frequency-doubled Nd:YAG lasers are used for carrying out pan-retinal photocoagulation.