Magneto-optical control of coherent nonlinear processes

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dc.contributor.advisor Welch ,George R . en_US
dc.contributor.committeeMember Belyanin , Alexey en_US
dc.creator Hsu , Paul Steve en_US
dc.date.accessioned 2010 -01 -15T00 :07 :34Z
dc.date.accessioned 2014 -02 -19T19 :32 :51Z
dc.date.available 2010 -01 -15T00 :07 :34Z
dc.date.available 2014 -02 -19T19 :32 :51Z
dc.date.created 2008 -05 en_US
dc.date.issued 2009 -05 -15 en_US
dc.identifier.uri http : / /hdl .handle .net /1969 .1 /ETD -TAMU -2813
dc.description.abstract Laser -atom interactions create atomic coherence and large nonlinear atomic polarization . We investigate resonant laser -atom interactions to generate large nonlinearities and control them using magneto -optical fields . Coherent control of high -order susceptibilities and magneto -optical rotation are demonstrated . Experiments are supported by theoretical studies that effectively describe the observed phenomena . It is shown that a new coherent field , with polarization orthogonal to a weak signal field , can be parametrically generated via an all -resonant four -wave -mixing process . This is demonstrated in a double -ladder system having two intermediate states between a ground and an excited state . It is shown that the parametricgeneration process can be coherently controlled by coupling lasers and magnetic fields . It is theoretically established that the underlying physics is a resonant three -photon process with a wide domain of control parameters . Electromagnetically induced transparency (EIT ) , where absorption of a weak probe is suppressed via quantum interference , is demonstrated in a usual three -level ladder system . It is observed that in contrast with EIT in a usual ladder system , addition of a second channel helps to suppress the absorption of two weak probe fields in the double -ladder system . The resulting enhancement of transmission in two different channels is due to gain caused by three -photon processes . Coherent control is strongly limited by coherence lifetime , which is the inverse of the dephasing rate . A lambda -system , having two ground states coupled to a common excited state by lasers , can generate a new eigen (dark ) -state that is transparent to incoming fields and hence suppresses fluorescence . However , ground -state dephasing perturbs the dark state . A new method for measuring the ground -state dephasing rate from fluorescence signals is proposed and a proof -of -principle experiment demonstrated . While two laser fields in a lambda -system are resonant with their respective transitions , the atomic polarizations are very sensitive to an applied magnetic field . This effect can be used for optical magnetometry . The degree of sensitivity of the magnetometer is determined by two competing parameters ?atomic density and laser intensity . It is shown experimentally that the optimal sensitivity reaches saturation , which is contrary to the idea that sensitivity increases indefinitely with an increase in the above parameters . en_US
dc.format.medium electronic en_US
dc.format.mimetype application /pdf en_US
dc.language.iso en _US en_US
dc.subject atomic coherence en_US
dc.title Magneto -optical control of coherent nonlinear processes en_US
dc.type Book en
dc.type.genre Electronic Dissertation en_US
dc.type.material text en_US
dc.format.digitalOrigin born digital en_US

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Magneto-optical control of coherent nonlinear processes. Available electronically from http : / /hdl .handle .net /1969 .1 /ETD -TAMU -2813 .

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