Abstract
We predict and observe the periodic reformation of spatial gratings in Na vapor commencing τ2 after the application of the second of two resonant (λ=5896) standing-wave excitation pulses which are themselves separated by τ. These gratings have spatial periodicity λ2, and backscatter our laser. One set of alternate echoes relaxes because of velocity-changing collisions; phase-changing collisions play no role. The other set is amplitude modulated with laser detuning Δ as cosΔτ.
Original language | English |
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Pages (from-to) | 851-855 |
Number of pages | 5 |
Journal | Physical Review Letters |
Volume | 43 |
Issue number | 12 |
DOIs | |
State | Published - 1979 |