ࡱ>  ibjbjT~T~ i66K|| c    $[9"  >>>:  >>>>  ~a>30c>}* }>}>l>4 c}| :  Lasers in Secondary Physics Education Adam Hyde Advisor: Dr. Natalia Dushkina This research explores how a laser pointer can be used to illustrate theories of diffraction, image transformations, light intensity distribution, solid state and gas state laser physics. The experiments are meant to be simple and easily implemented into the high school physics classroom. My first experiment used a green and red laser pointer to observe diffraction and calculate the track spacing between pits and lands of a compact disc. For the red laser pointer, wavelength (650 10)nm, the track spacing d was found to be (1.58 0.08)m and for the green laser pointer, wavelength 532 nm, d = (1.55 0.06) m. These values agreed with the manufacturer s specifications of 1.6 m. Lasers operating in a TEM00 MODE do not have a uniform distribution of intensity within its beam. The intensity often has a Gaussian distribution, which is represented by EMBED Equation.3 , where x is the distance from the center of the beam, x0 is the center of the beam (maximum intensity), I0 is the maximum intensity and w is the Gaussian radius of the beam. I allowed the beam to expand with distance traveled and scanned across it with a narrow slit attached to a photo detector. A Gaussian fit to the plot of intensity versus position gave the measured distribution widths of (0.75 0.05) mm and (0.38 0.03) mm for the green and red laser pointers respectively. 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