Abstract

The energy shifts caused by intense laser radiation (10⁸ to 10¹⁰ W/cm²) are investigated for several high-lying levels of calcium in order to determine the ac Stark shift of a loosely bound electron in a strong electromagnetic1field. Energy shifts are measured for the closely spaced levels 4s9s ¹S₀, 4s8d ¹D₂, 4s10s ¹S₀, and 3d5s ¹D₂ by using resonance ionization spectroscopy. The levels associated with Rydberg configurations show the expected ponderomotive energy shifts, but the 3d5s ¹D₂ shift is approximately half as large as the ponderomotive shifts.

© 1992 Optical Society of America

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