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Artist's conception of JILA's extreme ultraviolet (EUV) frequency comb. The original light source is a pulsed infrared laser, which is used to create a train of attosecond-long pulse bursts at EUV wavelengths (the bright white spot in the distance). Each of the resulting 'harmonics '--strong signals at regular fractions of the original infrared wavelength--has its own set of ' teeth' marking individual frequencies (series of adjacent white lines in the foreground), creating a frequency comb within each harmonic. To prove the new structure exists, JILA scientists observed a tooth interacting with argon atoms, indicated by the glowing atom symbol in the center foreground.
*PML, frequency comb, ultraviolet, wavelengths
See also http://www.nist.gov/pml/div689/euv_comb.cfm.
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