Laser scientists can now generate pulses of light as short as 1 fs = 10−15 s. One of the great difficulties in working with such short pulses is that many EM waves of different frequencies must be superposed to create the pulse. Because real optical elements like lenses and prisms are made of real materials for which the index of refraction is wavelengthdependent i. e., the material is dispersive, parts of the pulse with different frequencies travel through the optical elements at different speeds and become separated, so the pulse spreads out. Consider a short laser pulse which is normally incident on a piece of crown glass which is L = 3.39 mm thick. The index of refraction for a wavelength of λB = 402 nm in the blue part of the pulse is nB = 1.53, and the index of refraction for a wavelength of λR = 672 nm in the red part of the pulse is nR = 1.51. How much sooner does the red part of the pulse arrive at the end of the piece of glass than the blue part? Answer in units of fs.
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Laser scientists can now generate pulses of light as short as 1 fs = 10−15 s. One of the great diffi...
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