Nicolaas Bloembergen

Nicolaas Bloembergen (March 11, 1920 – September 5, 2017) was a Dutch-American physicist best known for his foundational contributions to laser spectroscopy and nonlinear optics, which earned him a share of the 1981 Nobel Prize in Physics. Born in Dordrecht, Netherlands, he developed key theoretical frameworks for nuclear magnetic resonance (NMR) relaxation effects during his early career and later advanced the understanding of light-matter interactions in intense laser fields. His work laid the groundwork for technologies including magnetic resonance imaging (MRI), masers, and high-precision atomic studies, influencing fields from quantum optics to ultrafast laser applications.

Bloembergen earned his master's degree from the University of Utrecht in 1943 and his Ph.D. from Leiden University in 1948, having conducted graduate research at Harvard University starting in 1946. He arrived at Harvard University in 1947 as a graduate student and became a Junior Fellow of the Society of Fellows in 1949, joining the faculty as an assistant professor in 1951 and rising through the ranks to become the Gerhard Gade University Professor, a position he held until his retirement in 1990; he later joined the faculty of the University of Arizona in 2001, where he continued his research until his death. Over his career, he mentored nearly 60 Ph.D. students and became a U.S. citizen in 1958.

The German invasion of the Netherlands in May 1940 profoundly disrupted Bloembergen's university studies, as the occupation led to closures, the removal of Jewish professors like Leonard S. Ornstein in 1941, and increasing threats to students. To evade forced deportation to labor camps, a policy targeting men aged 17 to 55, Bloembergen spent months hiding in the cellar of an aunt's remote farm and later indoors from 1943 to 1945, supplementing his concealment with occasional work as a farm laborer. These years brought severe personal hardships, including acute food shortages that forced the family to ration supplies and subsist on meager substitutes like tulip bulbs, while he studied physics by the dim light of a kerosene or storm lamp fueled by scarce heating oil. The occupation's broader impacts, including the deportation and persecution of Jewish friends and acquaintances amid the Holocaust, underscored the era's devastation and honed Bloembergen's resilience, shaping his determination to pursue advanced research abroad after the war.