Dr Chowdhury's work has enabled better understanding of electronic structure of molecules through optical, magneto-optical and quantum-mechanical methods. He has fabricated sophisticated experimental facilities for spectroscopic and fast kinetic studies. His studies on single crystal spectra throw light on spin-forbidden crystal-field bands in transition metal complexes, exciton transitions in bimolecules, CT transitions in diazines and parity-forbidden transitions in rare earth complexes. Other areas of work done by Dr. Chowdhury include CD/ORD/MCD/MORD/Zeeman. Effect of rare earth complexes and physico-chemical aspects of laser.