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Good_Lab_Report_lab5 - Jennifer Czaplicki Optics 375...

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Jennifer Czaplicki Optics 375 Section 0101 Lab 5 Due: November 22, 2009 Page 1 of 30 Procedure: On the optic track we set up a Helium Neon laser and beam aligner with a slide holder as indicated below. The distance between the beam aligner and the slide holder is adjusted for the trials so that position is recorded separately. At the end of the track there was a stand holding a moving photodetector and behind that was a screen that was used just to determine when the diffraction patterns were in focus. Often I used the back wall of the lab instead of the screen to focus the diffraction patterns. The distance between the slide and the moving platform with the photodetector is recorded for each trail since this distance fluctuated based on the needs of the trial. The diagram below indicates basic set up for the lab: Please note that the slides 4 slits or sets of slits labeled a,b,c, and d. Each slide had a notation of the width of the slit and the distance between the slits. These numbers were recorded to compare our measurements against. We looked at slides that had single slits, double slits which changed the width of the individual slits and the distance between the slits but each slide contained just single or double slits/slit sets. The last slide we looked at had multiple slits, 3, 4, and 5 slits with indication of the width of each slit and the distance between the slits for each slit set. In addition to examining the diffraction pattern of these slit slides I also looked at the diffraction pattern produced by the edge of a razor blade and by a piece of my own hair. Part 1: Examination of Single Slit Diffraction Patterns The first day we did the lab I placed the single slit slide into the slide holder which was positioned at 60.2 cm on the optic track. The photodetector was placed at about 6 cm beyond the end of the scale on the optic track which has a max reading of 115cm. The Helium Neon laser beam was shown onto a slit of the slide and the slide was adjusted until the diffraction pattern seemed level and the intensity coming through the slit seemed at its maximum. Then the beam was adjusted to get the clearest diffraction pattern possible before running the photodetector through the projected pattern and taking readings of the voltage versus time for the beam. Please note for all of these experiments the gain on the Voltage reading was 100. Data was taken for slit b and c on the slide, I did not take data for a or d because they were close to the edge of the slide and I was having difficulty keeping the beam straight and the slide level and oriented immediately in front of the beam. Ideally in future set ups of this experiment we will have the ability to level the slide in the slide holder than just adjust the slide left and right to project through the different sample slits. Nevertheless the data for each trial was saved in a text file Laser front at about 21.0 cm beam aligner 28.2 cm platform with moving photodetector slide holder for grating see
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