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Thesis Talk

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Alaina Green

on 16 April 2013

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Transcript of Thesis Talk

EIT magnetometer The story of the
laser diode LASER NOISE: FRIEND OR FOE? using laser noise in atomic magnetometry Alaina Green
15 April 2013 WHY? HOW? WHY? HOW? Magnetometry Applications Magnetometer Varieties LOW COST HIGH PRECISION fluxgate hall effect sensor SQUID MRI SERF EIT magnetometer AN ANALOGY WHAT WE CAN OBSERVE ELECTROMAGNETICALLY INDUCED TRANSPARENCY ZEEMAN EIT How can I use EIT to build a magnetometer? Rubidium
vapor photodetector resonant laser light (f=f ) nonresonant laser light transmission frequency transmission frequency A NARROWER LINEWIDTH g (0) 2 ground state splitting EIT linewidth ~ 100 hz linewidth ~ 1000 hz SOME RESULTS WHAT IS A LASER? cavity gain medium power HOW DOES A LASER WORK? HOW DOES A LASER DIODE WORK? power: electricity gain medium: p-n junction cavity: crystal boundary with heat with current HOW CAN WE TUNE MY LASER DIODE? circa 1985 Future work is one transition BETTER than the others? a current and a dynamically controlled temperature controller temperature controller new current controller F'=1 F=2 F'=2 F'=1 m=0 F'=1 m=1 F'=1 m=-1 F=2 m=0 F=2 m=1 F=2 m=2 F=2 m=-1 F=2 m=-2 F'=2 m=0 F'=2 m=-1 F'=2 m=-2 F'=2 m=1 F'=2 m=2 F=1 m=1 F=1 m=-1 F=1 m=0 VS. ? Acknowledgments Shannon O'Leary Alan Younis Steve Attinasi Shannon Mayer Steve Lamoreaux P S F=1 m=0 m=1 m=-1 m=2 m=1 m=0 m=-1 m=-2 p-type (lots of free holes) n-type (lots of free electrons) frequency transmission B sensitivity ~ 1 picotesla B sensitivity ~ 10 picotesla ~ 1 picotesla HOW CAN WE TUNE A LASER DIODE? (how can we control its frequency?) F=1 F=2 F'=1 F'=2 How can I USE laser noise? time time time transmission transmission transmission σ σ + - σ + σ - σ + σ - ΔE=hf o o f o f o frequency B correlation 0
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