Receiving a Sloan Foundation Fellowship in 1959, Bhaumik went to the University of California Los Angeles (UCLA) for a position as postdoctoral researcher. In 1961, he joined the Quantum Electronics Division at Xerox Electro-Optical Systems in Pasadena and began his career as a laser scientist. Concurrently, he taught Quantum physics and Astronomy at the California State University at Long Beach. In 1968, he was enlisted by the Northrop Corporate Research Laboratory, where he rose to become the director of the Laser Technology Laboratory and led a team that made pioneering contributions in research on excimer laser technology. One of the papers on this research was presented at the Denver, Colorado meeting of the Optical Society of America in March 1973. At this meeting, Bhaumik presented substantial evidence to demonstrate for the first time that an excimer laser could be efficient and powerful enough for practical utilization. The application of excimer lasers in Lasik eye surgery has resulted in vision correction in many cases. Excimer Laser is also used for difficult-to-treat skin diseases including psoriasis and vitiligo. The most widespread application of excimer laser has been in photolithography, a critical technology used in the manufacturing of microelectronic devices like cell phones. His contributions to the development of new and high power lasers merited his election by his peers to be a fellow of both the American Physical Society and the Institute of Electrical and Electronics Engineers.