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

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New Book by Prof. Mark Beck – Great Complement to Our diy Quantum Physics Book!

Prof. Mark Beck from the Dept. of Physics at Whitman College recently published an excellent book titled “Quantum Mechanics: Theory and Experiment.”  It is written for an advanced undergraduate/graduate quantum mechanics class.  This book presents the theory in its full formalism (with thorough, high-level math), as well as describes five laboratory experiments that explore the use of entangled photons in the

 
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Type I Downconversion Beta-Barium-Borate (BBO) Crystal Array for diy Entangled Photon Source

Our diy entangled-photon source, shown in the book’s Figure 142,  uses two BBO crystals that support type I down-conversion that are mounted according to a design by Paul Kwiat and his colleagues at the Los Alamos National Laboratory. The nonlinear crystal in our photon entangler comprises two 5 mm x 5 mm x 0.1 mm BBO crystals mounted face-to-face at

 
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405 nm Pump Laser for diy Entangled Photon Source

This is the 405 nm pump laser used in the circuit shown in the book’s Figure 141.   The laser is built from a Blu Ray disk burner laser diode.  We drive the laser diode with 160 mA to produce around 100 mW of 405-nm polarized light.  The laser diode is capable of producing 250 mW, but we

 
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Beam Diagram for Entangled-Photon Source

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

 
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quTools quED Entanglement Demonstrator

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

 
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