Peter Pitirimovich Sorokin

Peter Pitirimovich Sorokin, 84, of South
Salem, NY, passed away on Thursday, September 24. He is mourned by his wife of nearly
38 years, Anita; their children Elena and Paul; and his brother, Sergei.
Peter was born on July 10, 1931, in Boston, MA, the son of Elena Petrovna Sorokin and
Pitirim Aleksandrovich Sorokin. He grew up in Winchester, MA and attended Winchester
High School and Harvard University. He received a B.A. in 1952, and a Ph.D. in Applied
Physics in 1958, also from Harvard.
Peter was a laser pioneer. For 43 years, he worked as a physicist at International
Business Machines Corporation (IBM), mostly at the Thomas J. Watson Research Center in
Yorktown Heights, NY. With his colleagues, he invented the world's second and third
lasers. Another notable achievement was the co-invention of the dye laser, which is
used in many applications. For these and other discoveries, Peter received the Albert
A. Michelson Medal in 1974 from the Franklin Institute, the Comstock Prize in Physics
in 1983 shared with Theodor W. Hansch from the National Academy of Sciences, the
Harvey Prize in 1984 from Israel's Technion University, and the inaugural Arthur L.
Schawlow Prize in Laser Science in 1991 from the American Physical Society. A fellow
of the American Physical Society and the Optical Society of America, he was elected to
the American Academy of Arts and Sciences and the National Academy of Sciences. He was
also an IBM Fellow, the company's highest technical honor, from 1968 until his
retirement in 2000. He never dwelled on these distinctions, and in fact preferred to
discuss his latest area of scientific inquiry.
In retirement, Peter shifted his focus to the stars. He pursued a question in
astrophysics: why is light from some very bright stars absorbed at specific
wavelengths? Is it due to absorption by particles in interstellar dust, as many
astronomers have speculated, or is it due, as Peter's detailed theory explains, to
laser-like effects produced under certain conditions by hydrogen, the most common
element in the universe? Peter continued to research and publish his theory about
hydrogen in space until shortly before his death. He published his most recent paper,
"Evidence of H2 Four-Wave Mixing in 2175 Å "bump" stars" (Optics Communications,
2013). Peter loved to discuss his work, and anybody who knew him remembers his
enthusiasm for research, his warmth, and his originality.
Aside from his work, Peter loved spending time outdoors. He walked and hiked whenever
he could, whether in South Salem during the 21 years he lived there, or on mountain
trails throughout the Northeast. He also loved spending summers at the family cabin in
Canada, and could adeptly cut the grass there using a traditional scythe. He enjoyed
listening to classical music. Peter had a whimsical sense of humor and laughed easily.
He delighted in encouraging his family in all their intellectual and creative
pursuits. He was a gentle, generous, highly principled person, and a loving husband,
father, and brother.