Fraval, ElliottSellars, MatthewLongdell, Jevon2015-12-132015-12-130031-9007http://hdl.handle.net/1885/79530The decoherence in the ground state hyperfine transitions in Pr 3+:Y2SiO5 was investigated. A method for increasing hyperfine coherence times was demonstrated by the application of a specific external magnetic field. The magnitude and direction of the applied magnetic field was such that the transition's linear Zeeman shift about this field was zero. Results show that a phase memory time of 82 ms can be achieved for Pr3+:Y2SiO5 by using an external magnetic field to minimize the transition sensitivity to magnetic field fluctuations.Keywords: Bragg cells; Doping (additives); Dye lasers; Electron transitions; Ground state; Hamiltonians; Heterodyning; Laser tuning; Magnetic field effects; Matrix algebra; Optical pumping; Praseodymium; Superconducting magnets; Tensors; Yttrium compounds; Optical20042015-12-11