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Jeff Johansen, Kevin Zack SRJC Spring 2011 Physics 43

Laser Cooling and Trapping. Jeff Johansen, Kevin Zack SRJC Spring 2011 Physics 43. First time it was theorized. Theodor Hansch and Arthur Schawlow theorized laser cooling at Stanford University in 1975. 1. Theodor Hansch. Arthur Schawlow. First Successful Test.

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Jeff Johansen, Kevin Zack SRJC Spring 2011 Physics 43

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  1. Laser Cooling and Trapping Jeff Johansen, Kevin Zack SRJC Spring 2011 Physics 43

  2. First time it was theorized • Theodor Hansch and Arthur Schawlow theorized laser cooling at Stanford University in 1975.1 Theodor Hansch Arthur Schawlow

  3. First Successful Test • In 1985 Steven Chu invents laser cooling and receives a Nobel Prize in 1997.2 • Prof. Dr. William Daniel Phillips (USA) and Claude Cohen-Tannoudji (France) shared the Nobel prize with Steven Chu.2 Steven Chu Prof. Dr. William Daniel Phillips Claude Cohen-Tannoudji

  4. Theoretical • Atomic Resonance • Doppler Shift – Atom only “sees” the blue shift Δm-1 transition • Zeeman Effect • Polarization • Magneto Optical Trap

  5. Optics Optical Isolator Dielectric coated mirrors Beam Splitter Two lens telescope ¼ λ Plate

  6. Set Up Kelvin [5]

  7. Lasers • Trapping laser • Diode Laser • Its power requirements are proportional to the amount of atoms trapped, around 5mW • Hyperfine pumping laser • Diode Laser • Only needs to be a few milli-watts • λ based on the type of atom trapped

  8. Equipment Tunable Laser Anti-Helmholtz Coil Zeeman Slower

  9. The Cooling Process Murray, Andrew [3]

  10. What types of atoms are used? • Rb (Rubidium ) atom has an atomic resonance of 780 nm. • Cs (Cesium ) atom has an atomic resonance of 852nm. • Na (sodium ) atom has an atomic resonance of 589 nm. Srinivasan [6]

  11. Works Cited • [1] "The Nobel Prize in Physics 1997". Nobelprize.org. 16 Apr 2011 http://nobelprize.org/nobel_prizes/physics/laureates/1997/index.html • [2] "The Nobel Prize in Physics 2001". Nobelprize.org. 16 Apr 2011 http://nobelprize.org/nobel_prizes/physics/laureates/2001/index.html • [3] Murray, Andrew. "The Atom Optics Experiment at Manchester." Atom Cooling and Trapping Experiments at Manchester. 12 Jan. 2007. Web. 15 Apr. 2011. <http://es1.ph.man.ac.uk/AJM2/Atomtrapping/Atomtrapping.htm>. • [4] Ketterle, Wolfgang. "Ultralow Temperatures." 1 Jan. 2004. Web. 15 Apr. 2011. <http://cua.mit.edu/ketterle_group/popular_papers/ultralow_temperatures.htm>. • [5] Wagner, Kelvin. "Laser Cooling and Trapping." Http://optics.colorado.edu/~kelvin/classes/opticslab/LaserCooling3.doc.pdf. Web. 15 Apr. 2011. • [6] Srinivasan, R. "Laser Cooling and Trapping of Ions and Atoms." National University of Singapore. Web. 19 Apr. 2011. <http://sps.nus.edu.sg/~tangingw/Rubidium.pdf>.

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