= John L. Hall
{c}
{tag=Physicist}
= J. L. Hall
{c}
{synonym}
= John Hall
{c}
{synonym}
= Jan Hall
{c}
{synonym}
An experimental <optical physicist> whose precision <laser spectroscopy> connects stable optical oscillators with frequency standards. His lecture explains how <optical frequency combs> joined ultrashort-pulse technology to highly stable laser frequencies, making direct comparisons of optical and microwave clocks practical. Measuring an optical frequency becomes a controlled counting problem rather than an isolated wavelength calibration.<Nobel Lecture: Defining and measuring optical frequencies by John L. Hall>[Opening account of the convergence of ultrafast pulses, stable lasers and frequency combs]{ref}
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