2018 BFY III Abstract Detail Page
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| Abstract Title: |
W26: Speed of light using a pulsed diode laser |
| Abstract: |
This workshop explores a speed-of-light experiment suitable for introductory or intermediate level students to learn experimental basics (apparatus alignment, use of coaxial cables & oscilloscope, error propagation, systematic effects) yet which is easily expanded into an advanced experiment, in which students construct the electro-optical system themselves and examine laser diode non-linearity, impedance matching, and different methods of analysis. Participants will work through most of these aspects, as time allows.
The experimental concept is straightforward: a light pulse travels from a diode laser to a distant mirror and back to a detector; timing is done with a digital oscilloscope. Taking measurements at different mirror distances allows for elimination of electronic delays. Precision & accuracy are under 2% for mirror at 6 meters, even better if longer distances can be arranged.
The laser-detector system is easily assembled from commercially available parts (or save cost by making your own mounting mechanics). A moderately fast pulse generator and digital oscilloscope are needed to drive & measure the laser pulse. |
| Abstract Type: |
Workshop
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Author/Organizer Information |
| Primary Contact: |
Timothy Roach
College of the Holy Cross
1 College St
Worcester, MA 01610
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Workshop Documents |
| Workshop Doc 1: |
Download the Workshop Doc 1
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| Workshop Doc 2: |
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| Workshop Doc 3: |
Download the Workshop Doc 3
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