https://physlab-wiki.com/ 2026-04-15T03:24:40+00:00 https://physlab-wiki.com/ https://physlab-wiki.com/lib/tpl/UChicago/images/favicon.ico text/html 2026-02-03T16:22:19+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/phylabs/lab_courses/phys-211-wiki-home/hyperfine-spectroscopy-of-rubidium/day-1-tasks-revised?rev=1770153739&do=diff Day 1 Pt. 1 - Build the beam path to observe the signal Before you begin an instructor will provide an overview of the lasers and optical components you will be working with. After receiving this overview you can begin working on the exercise. The following tips and suggestions will help. text/html 2026-02-05T16:18:49+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/phylabs/lab_courses/phys-211-wiki-home/hyperfine-spectroscopy-of-rubidium/day-1-tasks-round1?rev=1770326329&do=diff Day 1 Pt. 1 - Build the beam path to observe the signal Before you begin an instructor will provide an overview of the lasers and optical components you will be working with. After receiving this overview you can begin working on the exercise. The following tips and suggestions will help. text/html 2026-04-07T14:30:55+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/phylabs/lab_courses/phys-211-wiki-home/hyperfine-spectroscopy-of-rubidium/day-1-tasks?rev=1775586655&do=diff Day 1 Pt. 1 - Build the beam path to observe the signal Before you begin an instructor will provide an overview of the lasers and optical components you will be working with. After receiving this overview you can begin working on the exercise. The following tips and suggestions will help. text/html 2026-02-09T17:16:30+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/phylabs/lab_courses/phys-211-wiki-home/hyperfine-spectroscopy-of-rubidium/day-2-tasks?rev=1770675390&do=diff Day 2 Pt. 1 - Record a calibration spectrum Before placing your group table on the main optical table, check that both the alignment laser beam and the IR laser beam pass through the centers of the two irises. You will have to use the video camera to observe the location of the IR beam on the two irises. Chances are the IR beam will be good and the alignment laser will be off. You should at least attempt to realign the alignment laser beam before asking for one of the lab staff to do it. Re… text/html 2026-02-25T15:08:19+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/phylabs/lab_courses/phys-211-wiki-home/hyperfine-spectroscopy-of-rubidium/day-3-tasks?rev=1772050099&do=diff Day 3 Pt. 1 - Restore Day 2 Setup As you did for the start of day 2, reinstall your group table on the main table and restore and realign the optics as necessary. Since the same photodetectors and the wedge beam splitter are used by all groups, you will have to reposition them for your setup. Regardless, you should be able to get the whole apparatus set back up to where it was at the end of Day 1 in under 30 minutes, including turning the IR laser on and tuning it to resonance.${}^{87}$${}^… text/html 2025-12-04T11:19:33+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/phylabs/lab_courses/phys-211-wiki-home/hyperfine-spectroscopy-of-rubidium/hyperfine-spectroscopy-spring2025?rev=1764865173&do=diff Hyperfine Spectroscopy of Rubidium TA Notes [ ] An oscilloscope trace, showing the raw spectrum (blue), the Doppler-free spectrum (yellow), their difference (red), and an interferometer showing the laser's frequency shift (pink) In this experiment you will use a narrow bandwidth, tunable diode laser to probe the hyperfine structure of natural rubidium (Rb). The technique of Doppler-free saturated absorption spectroscopy will be used to resolve the hyperfine structure which is otherwise mask… text/html 2024-06-11T16:34:46+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/phylabs/lab_courses/phys-211-wiki-home/hyperfine-spectroscopy-of-rubidium/hyperfine_ta_notes?rev=1718138086&do=diff Notes for TA grading the Hyperfine experiment Prelab Meeting Make sure that the students grasp the concepts covered in the RESEARCH section of the experiment wiki page. Guide them through the process of developing a sensible optical plan for both the spectroscopy and calibration parts. When they come to lab on day 1 they should have a diagram of their optical layout. Focus on conceptual understanding of what the different optical components do and how they combine to create the beam paths w… text/html 2026-01-06T14:58:29+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/phylabs/lab_courses/phys-211-wiki-home/hyperfine-spectroscopy-of-rubidium/interferometer-details?rev=1767729509&do=diff Our laser is designed to sweep back and forth over a small range of photon frequencies that correspond the the frequencies of the Rb transitions we wish to study. You will determine the calibration factor by building a Michelson Interferometer on your optical board. By directing the laser beam into the interferometer, and recording the intensity of the output on the scope, you can determine the calibration factor needed. Ultimately what we want to measure are the energy $\Delta\phi$$\phi_1 … text/html 2026-02-05T14:27:57+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/phylabs/lab_courses/phys-211-wiki-home/hyperfine-spectroscopy-of-rubidium/optics-steps?rev=1770319677&do=diff Building The Interferometer Refer to Figure 1 below while performing the following steps. * Align the alignment laser to pass through both irises attached to the main board. * Place your group board on the main board. * Set heights of your two iris's to match the height of the alignment beam above your group board. text/html 2026-01-09T18:09:09+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/phylabs/lab_courses/phys-211-wiki-home/hyperfine-spectroscopy-of-rubidium/setting-temperature?rev=1768000149&do=diff How to change the Rb vapor cell set point temperature. Follow these instructions to change the temperature of the vapor cell for the day 2 study of thermal doppler broadening. On the left side of the Laser Diode Controller you will find the Cell Temperature controller as shown in Picture #1. The illuminated display shows the current temperature of the vapor cell in degrees C. There are 4 push buttons along the bottom of the controller as shown; Menu, Up, Down, and Enter. text/html 2026-02-10T16:55:14+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/phylabs/lab_courses/phys-211-wiki-home/hyperfine-spectroscopy-of-rubidium/start?rev=1770760514&do=diff Hyperfine Spectroscopy of Rubidium - Winter 2026 TA Notes [ ] An oscilloscope trace, showing the raw spectrum (blue), the Doppler-free spectrum (yellow), their difference (red), and an interferometer showing the laser's frequency shift (pink) In this experiment you will use a narrow bandwidth, tunable diode laser to probe the hyperfine structure of natural rubidium (Rb). The technique of Doppler-free saturated absorption spectroscopy will be used to resolve the hyperfine structure which is … text/html 2025-08-11T16:49:24+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/phylabs/lab_courses/phys-211-wiki-home/hyperfine-spectroscopy-of-rubidium/teachspin-system-information?rev=1754945364&do=diff TeachSpin Laser Diode Spectroscopy System This page contains helpful information about the TeachSpin laser diode spectroscopy apparatus used for the Hyperfine lab. As of Aug-2025 we have two identical laser diode, photodetector, and vaporcell setups in use. text/html 2025-12-04T11:17:13+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/phylabs/lab_courses/phys-211-wiki-home/hyperfine-spectroscopy-of-rubidium/teachspin_hyperfine?rev=1764865033&do=diff Initial look at the TeachSpin hyperfine apparatus. First Data ---------- Peak 1 Dip t1 (ms) t2 (ms) 1 -3.6 -3.66 2 -3.16 -3.22 3 -2.72 -2.48 4 -2.42 -2.48 5 -1.98 -2.04 6 $\Delta t$$\Delta t$$\Delta \phi = \frac{4 \pi \Delta f}{c} (l_{1} - l_{2})$$\frac{\Delta f}{\Delta t} = 1.67x10^{11} \frac{Hz}{s}$