Ion-beam-sputtered (IBS) Coatings for Ultrafast Lasers and Applications
N. Anderson, L. Wang and T. Erdogan
In optics, dispersion is the phenomenon in which the phase velocity of a light wave in the material depends on its frequency (wavelength). One of the most well-known examples of dispersion is the splitting of white light into its full spectrum of colors (wavelengths) as it passes through a glass prism. Chromatic dispersion also causes the focal length of imaging lenses to be wavelength dependent, and thus specially designed lenses are required to mitigate chromatic effects on image quality in applications like optical microscopy. Both of these examples of so-called material dispersion involve continuous wave (cw) light. For pulsed light the effects of material dispersion are even more pronounced, with the most striking effects observed when ultrashort laser pulses are used. Here ultrashort laser pulses are defined as pulses having a temporal full-width at half-maximum (FWHM) below about 1 picosecond (ps), and therefore typically measured on the femtosecond (fs) timescale (10-15 sec). (As a result of an optical analog to the Heisenberg Uncertainty relation, such...
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