Download e-book for kindle: Advances in Atomic, Molecular, and Optical Physics by E. Arimondo, P.R. Berman and C.C. Lin (Eds.)

By E. Arimondo, P.R. Berman and C.C. Lin (Eds.)

ISBN-10: 0123810213

ISBN-13: 9780123810212

This quantity maintains the culture of the Advances sequence. It comprises contributions from specialists within the box of atomic, molecular, and optical (AMO) physics. The articles include a few assessment fabric, yet are meant to supply a complete photograph of contemporary very important advancements in AMO physics. either theoretical and experimental articles are integrated within the quantity. . foreign specialists . complete articles . New advancements

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Considering still optically thin vapor cells, we may associate the signal S in Equation (4) with the change in optical power as the modulation frequency is moved from off the CPT resonance to on resonance. The fractional (off-resonance) absorption B can be written as À Á B ¼ 1 À e À n0 L » n0 L; ð5Þ where n is the density of atoms, 0 is the (unpolarized) optical absorption cross section, and L is the length of the cell. The signal S can therefore be written S ¼ APin ¼ CA n0 LPin ; ð6Þ where Pin is the optical power incident on the cell.

2004) have proposed splitting the light fields into two parts with orthogonal polarization and recombining the fields after introdu­ cing a relative path delay between the þ and — components. The relative path difference of half a microwave wavelength (ground-state hyperfine splitting) shifts the phase of the dark state such that the reso­ nances constructively interfere. This path length difference can be intro­ duced by use of polarization filtering in a copropagating geometry or by reflecting the light back through the cell.

The presence of additional energy levels in these atoms can interfere with the efficient excitation of the coherent dark states and thereby reduce the contrast of CPT resonances. As discussed above, the reduced contrast results in higher instability for the clock. In addition, unwanted energy levels introduce asymmetries in the CPT resonance lineshape (Post, 2003) and produce AC Stark shifts, both of which adversely affect the atomic clock performance by producing timedependent frequency shifts of the clock output.

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Advances in Atomic, Molecular, and Optical Physics by E. Arimondo, P.R. Berman and C.C. Lin (Eds.)

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