= Colin Danson
{c}
= C. Danson
{disambiguate=optical physicist}
{c}
{synonym}
\b[Colin Danson] is a laser physicist whose research concerns ultra-high-power laser development and applications. His Oxford profile identifies this research portfolio and his work with the Oxford Centre for High Energy Density Science.<Colin Danson profile at the University of Oxford>[Research summary]{ref}
Danson coauthored the1999 Central Laser Facility report on single-shot <third-order intensity autocorrelation> measurements.<A Single Shot 3rd Order Cross-Correlator for Pulse Contrast and Pulse Shape Measurements by J. Collier and others>[Printedp194, byline]{ref} Characterizing <optical pulse temporal contrast> matters because a large <peak power> does not describe all the energy arriving before or after the main pulse.
For an original rectangular-pulse example,20joules delivered in1picosecond gives
$$
P=\frac{20\,\mathrm J}{10^{-12}\,\mathrm s}=20\,\mathrm{TW}.
$$
A feature at one thousandth of that power still has20gigawatts. The ratio is small while the absolute power is large. Neither number alone specifies the feature's energy, which also depends on its duration.
Real pulse profiles require the integral $E=\int P(t)\,dt$ rather than assuming a rectangular shape. A diagnostic must therefore connect <laser pulse energy>, <pulse duration> and contrast with the actual temporal waveform. The example illustrates that measurement problem; its numbers are not historical Vulcan specifications.
\Image[https://www.physics.ox.ac.uk/sites/default/files/styles/scale_crop_732/public/user_photos/Colins%20photo%20Jul%202026_2.jpg?itok=Pn7uy1cO]
{title=Colin Danson}
{id=image-colin-danson-oxford}
{description=Externally hosted profile photograph linked from the University of Oxford Department of Physics biography.}
{width=250}
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