= Peter Alden Franken
{c}
{tag=Physicist}
{title2=1928-1999}
= Peter Franken
{c}
{synonym}
= Peter A. Franken
{c}
{synonym}
= P. A. Franken
{c}
{synonym}
<Peter Alden Franken> coauthored the 1961 observation of optical <second-harmonic generation>. Intense ruby-<laser> <light> passing through <quartz> produced radiation at twice the incident <frequency>. A quadratic contribution to <nonlinear polarization> explains why this is possible: squaring a sinusoidal <electric field> produces a term at twice its <frequency>. The experiment made frequency conversion a measured consequence of nonlinear material response.<Generation of Optical Harmonics by Peter Alden Franken and others>[1961 original report, ruby-laser illumination of quartz and frequency-doubled radiation; quadratic-response interpretation]{ref}
A <physicist>.<Professional profile of Peter Alden Franken>[Independent professional identity]{ref}
\Image[https://optics.arizona.edu/sites/default/files/styles/az_medium/public/2022-07/Webite-InMemoriam-Profile-Photo-newsite-template-27jul22-franken.jpg.webp?itok=xgmdJ1Hi]
{title=Portrait of <Peter Alden Franken>}
{width=240}
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