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Continuous Spatial Photon Echoes

C. Schnurr

Published Jan 1, 1994• 0 citations
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We report the observation of continuous spatial photon echoes in a magnetically compensated supersonic beam of atomic samarium. Atoms cross two spatially separated cw laser pump fields to produce an intense cw echo downstream. In contrast to previous studies of continuous coherent radiation in separated fields, the signals are readily observable with the unaided eye. The echo signal, which is generated in a magnetic-field gradient, differs from usual rephasing phenomena owing to a quadratic time dependence for the optical phase in the frame of the moving atoms.
We demonstrate optical methods for studying the slowly varying part of atomic center of mass wave functions, i.e., with thermal plane-wave factors removed. Utilizing continuous spatial photon echo fields and a simple lens system, the techniques determine the spatial distribution of the slowly varying wave function when the echo field is measured in the image plane. The corresponding momentum space distribution is obtained with high momentum resolution (0.1% of the photon momentum) using Fourier transform optics.