Dr Jha has to his credit significant contribution in solid state and plasma physics. He did pioneering work on non-linear optics. He has made significant contributions to the application of theory of Raman scattering from electronic exs in solids to the study of resonant Raman scattering of an intense laser beam and to the investigation of ex and electron-hole sound exchange mechanisms for superconductivity in semi-metals and excitonic insulators. In plasma physics, Prof. Jha has contributed to the theory of interaction of waves in a plasma and the generation of laser-induced parametric instabilities, connected with the inertial confinement scheme for a thermonuclear fusion reactor.