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diffraction What is LASER Light? Laser light is monochromatic, collimated, and coherent • Monochromatic- All the light waves are of the same frequency It looks like one color It does not spread out after passing through a prism • Collimated- All the light waves are parallel Show the spot does not spread out Use chalk powder
6 2 Interference and diffraction Huygen ’s Principle Single slit diffraction Circular diffraction The diffraction limit Diffraction effects of apertures When light is passed though an aperture the light beam is smeared out Although this effect is small for large apertures It limits
The integral corresponding to the imaginary part of the diffraction integral is zero Following similar arguments as in part I or in the previous section we can show that the wave travelling in the direction given by is f J,(v sin 2nv*t)e2"""' (1 1) multiplied by a constant usually taken out from the diffraction integral The wave
As our results show, the lowest frequency, 800 Hz, had the greatest ratio of intensity level compared before and after the diffraction occurred As the frequencies increased, the ratio decreased and the intensity level was effected more and more Our experimental results supported the fundamental ideas on diffraction
Frequency • Maximum Usable Frequency (MUF) is defined as the upper limit of available frequencies for a given atmospheric situation • MUF can be approximately measured by monitoring bacon stations at or near the frequency in question • In the U S , 4 beacons are available from the National Bureau of Standards