Experimental Modern and Quantum Physics for Do-It-Yourself Science Enthusiasts 

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Beam Diagram for Entangled-Photon Source

diy Entangled photon source described in the book  "Exploring Quantum Physics through Hands-On Experiments" by David Prutchi Ph.D. and Shanni R. Prutchi

This picture supplements Figure 148 in the book.  The colors should help you visualize the paths of the beams in our entangled-photon source:  Violet – 405 nm pump laser beam; Pink – 810 nm signal and idler entangled-photon beams.  A detailed schematic diagram for the entangler is available in the book’s Figure 147.  Figure 149 shows the 405 nm beamstop. Read more…

 
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RCA 6655A PMT Data Sheet

RCA 6655A photomultiplier tube

This is the datasheet for the RCA 6655A PMT used in the probe shown in the book’s Figure 30: RCA_6655A_Datasheet

This is the datasheet for Hamamatsu’s replacement of the RCA 6655A PMT: Hamamatsu replacement for RCA 6655A R2154-02

Schematic diagrams for the probe are in Figure 29.

 
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Assembly View of diy Variable-Output, High-Performance PMT High-Voltage Power Supply

Variable-output, low-ripple, high-stability, high-voltage power supply described in pages 38-40 of "Exploring Quantum Physics Through Hands-On Projects."

We are posting this picture to help you construct the variable-output, low-ripple, high-stability, high-voltage power supply described in pages 38-40 of “Exploring Quantum Physics Through Hands-On Projects.”  The schematic diagrams for this power supply are in the book’s Figure 31.  Output voltage (up to 2 kV) and current (up to 1 mA) are monitored via two LCD panel meters. Read more…

 
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Compton Scattering Experiment Using Spectrum Techniques’ Equipment

Observing Compton Scattering Using the Spectrum Techniques UCS-20 MCA

Spectrum Techniques of Oak Ridge, TN – a top supplier of Exempt Quantity radioisotope sources and nuclear measurement instrumentation – released today our tutorial:

“Experiment Note: Exploring Compton Scattering Using the Spectrum Techniques Universal Computer Spectrometer” Read more…

 
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quTools quED Entanglement Demonstrator

quTools' quED quantum entanglement demonstrator system
Image Credit: quTools

quTools of München, Germany is the maker of the quED quantum entangled state demonstrator system to generate and analyze polarization entangled photons.  This system is a professionally-manufactured version of the type of entangled-photon generator used by many universities, and similar to the diy version described in Chapter 8 of our book (Figure 148).

quED employs a spontaneous parametric down conversion process (type I or type II; collinear or non-collinear) to generate polarization entangled photon pairs. Fiber-coupled single photon detectors in connection with polarizing filters are used to detect the photon pairs, analyze their polarizations and verify their non-classical correlations. Read more…

 
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ALPhA’s Single Photon Detector Group Order for Educational Institutions

Excelitas Perkin-Elmer Single Photon Counting ModuleALPhA (Advanced Laboratory Physics Association) has worked out a deal with Excelitas to sell Single-Photon Counting Modules (SPCMs) to instructional labs.  The detectors carry labels specifying that these units belong in the undergraduate instructional labs and not in research labs. These educational detectors have reduced specs, notably a higher background dark count rate, compared to other models from the company.

The set of four SPCMs can be purchased for $5,720 (instead of the usual ~$10k). Read more…

 
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Actively-Quenched SPAD SPCM Student Design Project

diy Single-Photon Counting Module designed by students at University of Illinois

Image Credit: Oliver Jan and Phil Makotyn

In 2006, then-students Oliver Jan and Phil Makotyn from University of Illinois (at Professor Paul Kwiat’s lab) developed an actively-quenched Single-Photon Counting Module (SPCM) based on the Perkin-Elmer C30902S-DTC Single-Photon Avalanche Photodiode (SPAD). Read more…

 
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β-Particle Magnetic Deflection Experiment – Supplementary Pictures

β-Particle Magnetic Deflection Experiment

The book’s Figure 65 shows our β-particle magnetic deflection setup.  It consists of a 90Sr disc source of beta particles, two copper washers to collimate the beam, and GM tubes placed at 0º and 90º to the β-particle beam. A sufficiently strong magnetic field (around 800 Gauss = 0.08 Tesla) provided by a permanent magnet bends the beam so much that it is easily detected at a right angle (notice the meter needles in the pictures above).

  Read more…

 
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Attenuation of Alpha, Beta and Gamma Radiation in Air

 Measurement of alpha, beta, and gamma radiation by air as a function of distance

The attenuation of radiation as a function of distance can be measured using a radiation counter with a Geiger-Müller tube that is sensitive to α, β, and γ radiation.  We used exempt plastic-disc sources containing Polonium 210 (210Po), Strontium 90 (90Sr), and Cobalt 60 (60Co) to experiment with the penetrating power of α, β, and γ radiation in air.  Read more…

 
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Color Spectrograph Using Spectrometer of Figure 80

Color spectrographs using the spectrometer described by Prutchi in "Exloring Quantum Physics Through Hands-On Projects"

These two images supplement the book’s Figure 81.  They were taken with the spectrometer of Figure 80.

 
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Our New Photomultiplier :)

A very funny cartoon by Prof. Dr. Claus Grupen of Siegen University:

Funny physics photomultiplier cartoon by Prof. Claus Grupen

 

 
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diy Measurement of the Charge-to-Mass Ratio of the Electron Using “Magic Eye” Tube – Supplementary Pictures

diy setup for measuring e/m using a 6AF6-G magic eye tube

Figure 54 in the book shows our setup based on a 6AF6-G “magic eye” tuning tube to measure e/m.  The pictures in this figure supplement the book’s Figure 54 to help you build your own system.   In the 6AF6, electrons produced by a thermionic cathode cause fluorescence on the tube’s anode. Applying an external magnetic field curves the path of the electrons reaching the anode’s fluorescent coating. Knowing R and the voltage applied to the tube allows one to calculate e/m. Read more…

 
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d.i.y. Two-Channel Single-Photon and Coincidence Counter

Inside of diy 2-channel single-photon and coincidence counter module

This is an inside view of the two-channel photon and coincidence counter of the book‘s Figure 145.  It is used in the photon entanglement experiments of Chapter 8. Read more…

 
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d.i.y. Measurement of Electron’s Charge-to-Mass Ratio Through Hoag’s Method – Supplemental Pictures

d.i.y. Measurement of Electron's Charge-to-Mass Ratio Through Hoag's Method

Figures 51 and 52 in the book show how to use an oscilloscope 2AP1 CRT to measure e/m using Hoag’s method.  The pictures in this figure supplement the book’s, showing you how to construct the d.i.y. setup, as well as the way in which the electron beam fan is reduced to a point as the magnetic field fulfills the focusing equation.  In this setup, an AC signal is placed across one set of plates of the CRT to produce a line on the screen. The solenoid is then energized until the line makes one complete helical turn. Read more…

 
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d.i.y. Maltese Cross Cathode Ray Tube – Supplementary Picture

diy Maltese Cross Cathode Ray Tube

This is a supplementary picture to the book’s Figure 43.  It shows our d.i.y. “Maltese Cross” CRT connected to the vacuum system and high-voltage power supply.  Please note that the HV power supply is configured to produce a negative output referenced to ground.  The anode and target electrode are at ground potential.  The cathode rod inside the glow-discharge electron gun is connected to -HV. Read more…

 
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