Dr Jain's main field of research has been defects and colour centres in polar crystals; high temperature properties of solids; Raman infrared and electronic spectra of crystals; thin films; and ultrapurification of semiconductors and semiconductor devices. Some of the experimental techniques developed by. Dr Jain have been used in many laboratories in the United States and in West European countries. In recent years, Dr Jain has been involved in designing and developing sophisticated electronic items to meet the requirements of Armed Forces.