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Lab 4.5

# Lab 4.5 - Randall Robert(9771 Jacob Porta(7090 Optical...

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Randall Robert (9771) Jacob Porta (7090) Optical Electronics Lab EE 4270 Experiment 4.5 Applications of Diffraction Gratings Tuesday; September 11, 2005

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Introduction: This experiment uses a commercial diffraction grating to compare the wavelengths of two different lasers, and to display the spectrum of wavelengths in visible light. Figure 1: Arrange the components to resemble figure 1. With the scale attached to the screen, center the undiffracted, or zero order beam at the 0 position. Adjust the angle of the screen so that “+1” and “-1” are equally spaced from the center of the screen. Record this distance as x. Using the formula below calculate the diffraction angle. = = - Y X Y X 1 tan ) tan( θ θ For the different lasers used the following values were recorded and computed. Laser Type X[cm] Y[cm] θ HeNe Laser 11 33.5 18.2 Solid State 11.4 33.5 18.7 The diffraction angle is related to the period, d, of the grating by: ( 29 θ λ sin d n = Where n is the diffraction order. Given λ =0.6328[ μ m], and knowing that n, the diffraction order, to be 1, calculate the period of the diffraction grating.
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