Who confirmed Einstein's theory of stimulated emission in 1928?

• A. Gordon Gould
• B. Rudolph Ladenburg
• C. Theodore Maiman
• D. Valentin Fabrikant

Answer: (B)

Rudolph Ladenburg is credited with confirming Einstein's theory of stimulated emission in 1928. Ladenburg's work was significant in the field of quantum mechanics and directly related to Einstein's earlier theoretical ideas about light and its interaction with matter. This confirmation played a crucial role in the development of laser technology, as it provided experimental backing to Einstein's theoretical predictions on how atoms could be stimulated to emit coherent light.

Gordon Gould is known for his contributions to laser development, but he did not confirm the theory in question during that time. Theodore Maiman is recognized for creating the first working laser in 1960, which came long after Ladenburg's confirmation of stimulated emission. Valentin Fabrikant was involved in later developments regarding lasers and stimulated emission but was not responsible for the initial confirmation done by Ladenburg.