Didn’t Alfred Kastler shape the world of physics as we know it? Here at Kastler, we stand on the shoulders of a giant. Kastler is part of a university building in Lyon. It stands as a testament to scientific advancement. It also honors a Nobel laureate. Alfred Kastler was born in 1902 in Alsace. This region was then annexed by Germany. His early education was in German. Later, he transitioned to French schooling.
Kastler’s academic journey led him to the École Normale Supérieure. There he excelled in physics. Overwork and depression caused him to take a year off. Despite these challenges, he earned his Diplôme d’Études Supérieures. In 1925, he married Elise Cosset. He became a professor at the Lycée of Mulhouse. Later, he taught at Colmar and Bordeaux.
In 1931, Alfred Kastler began his research career. The University of Bordeaux was home to the French school of molecular diffusion. Jean Cabannes led this school. Kastler explained the polarization of Raman lines that year. This explanation involved the interaction between light and molecular momenta.
Alfred Kastler’s doctoral thesis focused on mercury vapor fluorescence. His research explored the spatial orientation of atomic moments. This work shaped his research after 1949 at the École Normale Supérieure. Kastler’s group developed optical methods for studying magnetic resonance. These methods relied on the relationships between polarization and atomic properties.
After teaching in Clermont-Ferrand, Kastler returned to Bordeaux in 1938. He succeeded Pierre Daure as a physics professor. In Bordeaux and later in Paris, he studied sodium D lines in the twilight sky. He also researched Raman spectroscopy of monocrystals. Kastler showed that the sodium D line had resonance characteristics.
His work on Raman spectroscopy led him to reorient his laboratory. He advised Jean Brossel to study magnetic resonance with Francis Bitter at MIT. Together, Kastler and Brossel developed an optical method for detecting magnetic resonance. This method excited atoms with polarized light. It allowed the study of excited atomic levels.
In 1950, Alfred Kastler invented optical pumping. This technique extended the detection of Hertzian resonances to the ground state of the atom. By irradiating atoms with polarized light, he concentrated them in specific energy levels. Jean Brossel returned to Paris in 1951. He collaborated with Alfred Kastler. Together, they built a successful research team. Claude Cohen-Tannoudji and Bernard Cagnac joined them.
Alfred Kastler received the Nobel Prize in Physics in 1966. The Swedish Academy recognized his work on optical methods for studying Hertzian resonances in atoms. Despite suggestions, Kastler denied being the grandfather of the laser. He modestly concluded that optical pumping’s use in lasers was just chance.
Beyond research, Alfred Kastler co-authored physics textbooks. He also wrote a dictionary of physics. From 1970, he studied the history of science. He wrote monographs on scientists like Carnot and Einstein. Kastler also explored the work of scientists from his native Alsace.
Alfred Kastler also wrote poetry in German. His poems reflected his experiences during World War II. They expressed themes of hate, reconciliation and European unity. He dedicated his poetry book to his brother Henri. Henri died in Galicia during the war. Kastler was a humanist who advocated for peace and human rights. He joined the Pugwash Movement. He spoke against nuclear weapons. Kastler also aided refugee scientists. He fought against the cruel treatment of animals. Alfred Kastler died in 1984.
Kastler’s legacy lives on. This building stands as a reminder. It reminds us of his scientific achievements. It highlights his commitment to humanity. Take a moment to reflect on the impact of Alfred Kastler’s work. Consider his dedication to science and peace.