= Arthur Leonard Schawlow
{c}
{tag=Physicist}
{title2=1921–1999}
{wiki}
= Arthur L. Schawlow
{c}
{synonym}
= Arthur Schawlow
{c}
{synonym}
= A. L. Schawlow
{c}
{synonym}
<Arthur Leonard Schawlow> developed methods of <laser spectroscopy> that resolve features hidden by <Doppler broadening>. His lecture explains <saturation spectroscopy> with a strong pump beam and a weaker counterpropagating probe beam. At the common resonance, both beams address the same velocity class of <chemical atoms> or <molecules>; modulating the pump reveals a narrow feature in probe transmission. Such measurements distinguish intrinsic spectroscopic structure from the broadening caused by <thermal motion>.<Spectroscopy in a New Light by Arthur Leonard Schawlow>[1981 authored lecture, counterpropagating pump/probe arrangement and Doppler-free resonances]{ref}
A <physicist>.<Professional profile of Arthur Leonard Schawlow>[Independent professional identity]{ref}
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{title=Portrait of <Arthur Leonard Schawlow>}
{description=Jose Mercado / Stanford News Service. https://creativecommons.org/licenses/by/3.0/[Creative Commons Attribution 3.0 Unported.], via Wikimedia Commons.}
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{width=250}
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