Transcription of Lecture 5 - UIUC
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Lecture 5 - UIUC
Lecture 5, p 1 =2 = c0II0 Sum2I00 = c/3yyLecture 5:Applications of Interference and DiffractionLecture 5, p 2 TodayCircular diffraction Angular resolution (Rayleigh s criterion) Minimum spot sizeInterferometers Michelson ApplicationsLecture 5, p 3 The size of the spot is determined by the diameter, D, of the aperture, and wavelength, , of the incident by a circular aperture is similar to single)slit diffraction . But note the difference:Image plane00II0 o DImage planePoint objecta Circular apertureThe Airy disk .The central lobe contains 84% of limited OpticsDiffraction has important implications for optical instrumentsEven for perfectly designed optics the image of a point source will be a little blurry ) the circular aperture produces diffraction .
The diffraction is already limited by D laser. Increasing D lens doesn’t help. There is a huge industry devoted to developing cheap blue diode lasers (λ~ 400 nm) for just this purpose, i.e., to increase DVD capacity. “Blue-Ray”technology! There are many times you would like to focus a laser beam to as small a spot as possible.
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