Abstract

Seven schemes are studied theoretically for Doppler-free two-photon excitation of rare ⁴¹Ca isotope using single-mode continuous-wave lasers. The ionization efficiencies and optical selectivities for all the schemes are calculated for various powers of the excitation and ionization lasers and for various focusing conditions of the two lasers. To maximize the ionization efficiencies and the optical selectivities, wavelength-dependent Stark compensation is used. Certain laser wavelengths of the ionization step termed as magic wavelengths are identified for compensating the Stark shift induced by the excitation laser. The effects of the Stark-shift-induced asymmetry and its reversal by selecting the appropriate magic wavelength for the ionization step for various excitation and ionization laser intensities are investigated. The ionization efficiency and optical selectivity for the best scheme after Stark compensation are found to be $8.4\times {10}^{-4}$ and $\sim 9\times {10}^3$, respectively.

© 2006 Optical Society of America

Isotope selective near-resonant two-photon ionization of ⁴¹Ca isotope via the 4s11s ¹S₀ intermediate state

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