https://physlab-wiki.com/ 2026-04-14T15:04:39+00:00 https://physlab-wiki.com/ https://physlab-wiki.com/lib/tpl/UChicago/images/favicon.ico text/html 2023-05-03T16:17:16+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/phylabs/lab_courses/phys-211-wiki-home/single-photon-interference-spring/apparatus?rev=1683145036&do=diff Single Photon Interference Apparatus ---------- WARNING: The pump laser beam WILL cause permanent eye damage, including possible blindness, if used without protection. Laser safety goggles MUST be worn at all times and the door MUST be closed when the laser is on, even when the table is covered. Wait for instructions before turning on the pump laser.$R_1$$R_2$$\Delta t$$R_{acc}$$R_{acc} = R_1 * R_2 * \Delta t$ text/html 2023-01-26T14:41:17+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/phylabs/lab_courses/phys-211-wiki-home/single-photon-interference-spring/down-conversion-studies?rev=1674762077&do=diff Initial data and ideas for new 3 week version of single photon studies. Part I Setup Radius of curvature of guide = 84cm. APD PULSES : Positive polarity, 4.3V, 16.5ns FWHM. TAC set to 0.05μs range. LASER Current = 70.7mA LASER Temp = 10.31°C text/html 2023-03-16T18:21:50+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/phylabs/lab_courses/phys-211-wiki-home/single-photon-interference-spring/spi-outline?rev=1679005310&do=diff Single Photon Interference text/html 2022-11-10T11:21:59+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/phylabs/lab_courses/phys-211-wiki-home/single-photon-interference-spring/start?rev=1668097319&do=diff Single Photon Interference - Spring 2022 ---------- There are only two known physical phenomena for which classical physics fails to provide an explanation of the experimental results: Wave-Particle Duality and Quantum Entanglement.  For both of these phenomena, attempts to explain the results of experiment using only classical physics concepts leads to nonsensical contradictions. Quantum mechanics, however, correctly predicts the outcomes of these experiments. In this experiment you will in… text/html 2022-06-06T12:40:28+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/phylabs/lab_courses/phys-211-wiki-home/single-photon-interference-spring/system_tuneup_spring_2022?rev=1654533628&do=diff Did a tune up on the apparatus 3/28/22. Tweaked crystal and detector alignments to optimize the rates. Setup 50/50 BS in place, no irises in place, paths identical, Piezo at 35V. 10s count, rates given in Hz. Room lights on table uncovered. Laser On text/html 2022-04-04T13:26:49+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/phylabs/lab_courses/phys-211-wiki-home/single-photon-interference-spring/wpd_optics?rev=1649093209&do=diff Optical Setup For Wave Particle Duality The photon source The left side of the optical table contains our photon source. (See Fig. 3.) Light from a 20 mW 405 nm laser diode (called the pump beam) is reflected off of two mirrors so that it passes through a beta barium borate (BBO) crystal which is mounted on a rotation stage. Most of the photons in the pump beam pass through the BBO crystal unaffected. However, about 1 out of 106 pump photons will excite the BBO crystal in such a way that when …