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Sensitive detection of Doppler-free two-photon-excited 2S positronium by spatially separated photoionization

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Danzmann,  Karsten
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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372217.pdf
(Publisher version), 794KB

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Citation

Fee, M. S., Mills, A. P., Shaw, E. D., Chichester, R. J., Zuckerman, D. M., Chu, S., et al. (1991). Sensitive detection of Doppler-free two-photon-excited 2S positronium by spatially separated photoionization. Physical Review A, 44(1), R5-R8. doi:10.1103/PhysRevA.44.R5.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0013-5CB8-0
Abstract
Using a spatially filtered pulsed laser at 486 nm we have photoexcited positronium to the 2S state and detected it via a delayed and spatially separated 532-nm photoionization pulse. We have extended our observations down to low 486-nm power to explore the possibility of a cw measurement of the positronium 1S-2S interval. A model calculation taking into account the velocity distribution of the 235-K positronium from an oxygenated cold Al(111) target, the parameters of the laser beams, and the nonlinear excitation probability explains our data. The same model indicates that a cw measurement is presently feasible.