Thin-film Fabry-Perot Etalons for Intermediate and Advanced Labs
University of Michigan, Ann Arbor, MI, June 10 - 12, 2019
4 setups available
We will present examples of classic experiments where these devices are used. Etalon thicknesses for these type of experiments range from 60 micrometers to a few millimeters and are made of fused silica with thin-film coatings.
At least TWO experiments (possibly a third one under development) will be presented:
1) Sodium D-line Splitting by Two Measurement Methods: introduces students to the splitting of atomic spectral lines due to the spin of the optically active electron in hydrogenic atoms (“fine structure”) as well as selection rules. Participants will measure the sodium D-line splitting by two independent methods: (a) using a Czerny-Turner type spectrometer; and (b) using a thin-film Fabry-Perot etalon, a cellphone camera, and the ImageJ free software. Combining the results, with proper uncertainty propagation, is a great exercise for teaching the weighted average method. Please refer to Figures 1 and 2.
Figure 2: Sodium D-line splitting using a Thin-film Fabry-Perot Etalon and a cellphone camera.
Ramón O. Torres-Isea is Director of Intermediate and Advanced Physics Laboratories at the University of Michigan, Ann Arbor. He was recipient, with Prof. Carl Akerlof (Univ. of Michigan), of the 2015 Jonathan F. Reichert and Barbara Wolff-Reichert Award for Excellence in Advanced Laboratory Instruction. He received his B.S. and M.S. in Physics from Eastern Michigan University in 1980 and 1983, and quickly joined the workforce, developing a career as an industrial physicist. Since his return to academia twenty four years ago, he has continuously worked to improve the teaching of physics laboratories. He manages the daily operations of the laboratories, teaches sections of intermediate laboratories as needed, and co-teaches every semester the senior laboratories with a rotating group of faculty members. He taught also for ten years a graduate physics course in computer control of research instrumentation at the department. Over the years Ramón has performed research in Optical Depolarization in Birefringent Crystals, Electrical Arc Physics, Shape-memory Alloys, and for the past ten years in Nuclear Physics, as part of a team led by Prof. Frederick Becchetti at the University of Michigan-University of Notre Dame TwinSol facilities. He is co-developer of the UM-DAS, a deuterated scintillator array for fast neutron detection. He is also co-inventor of three U.S. patented technologies: actuators which couple shape-memory thermal actuating elements with magnetic actuating elements; arc-suppressing current interrupters; and asynchronous magnetic-bead rotation technology for use in identifying and treating bacterial infections. Ramón developed and has taught for nine years Forensic Physics, an outreach survey class for high-school students.
Ramón O. Torres-Isea, Department of Physics, Univ. of Michigan, 450 Church Street - Randall Lab, Ann Arbor, MI 48103.
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