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Autler-Townes Splitting in Molecular Lithium: Prospects for All-Optical Alignment of Nonpolar Molecules

1999; American Physical Society; Volume: 83; Issue: 2 Linguagem: Inglês

10.1103/physrevlett.83.288

1092-0145

Jianbing Qi, Guenadiy Lazarov, Xuejun Wang, Li Li, L. M. Narducci, A. M. Lyyra, Frank C. Spano,

Laser-Matter Interactions and Applications

We demonstrate Autler-Townes (AT) splitting in molecular lithium using cw triple resonance spectroscopy. The pump and tunable probe lasers create sub-Doppler double resonance excitation of an upper rovibrational level. The line shape is split in the presence of a third, coupling laser. The AT line shape consists of the superposition of several narrower twin peaks, one for each $|{M}_{J}|$. The splitting is proportional to $|{M}_{J}|$ enabling resolution of the individual ${M}_{J}$ peaks. Thus, this all-optical technique can be used to align nonpolar molecules. The line shapes are in excellent agreement with theory.