In recent years, coherent effects in atomic and molecular systems have been studied extensively, especially in several new classes of effects, such as lasing without inversion (LWI), electromagnetically induced transparency (EIT), coherent population trapping (CPT), AC Stark effect and Autler-Townes (AT) splitting in multilevel systems. The AC stark effect and Autler-Townes splitting in molecules have only been investigated recently. We demonstrate AC stark effect and Autler-Townes (AT) splitting in a lithium molecule using cw multi-photon spectroscopy. The excited upper level of the $G^{1}\\Pi_{g}$ is prepared by the optical-optical double resonance (OODR) excitation. The OODR line is split in the presence of a third coupling laser, which couples the upper level to an another intermediate level when the coupling laser is on or near resonance transition. The AT line shape consists of the superposition of $|M_{J}|$ components which have been resolved for $G^{1}\\Pi_{g}(v=12, J=3,f)$ . We find that the AT splittingis linearly proportional to $|M_{J}|$ , which allows the excitation of molecules with a selected $|M_{J}|$ level. The AC Stark shift of the OODR line is observed when the coupling laser is detuned from the resonance transition.In recent years, coherent effects in atomic and molecular systems have been studied extensively, especially in several new classes of effects, such as lasing without inversion (LWI), electromagnetically induced transparency (EIT), coherent population trapping (CPT), AC Stark effect and Autler-Townes (AT) splitting in multilevel systems. The AC stark effect and Autler-Townes splitting in molecules have only been investigated recently. We demonstrate AC stark effect and Autler-Townes (AT) splitting in a lithium molecule using cw multi-photon spectroscopy. The excited upper level of the $G^{1}\\Pi_{g}$ is prepared by the optical-optical double resonance (OODR) excitation. The OODR line is split in the presence of a third coupling laser, which couples the upper level to an another intermediate level when the coupling laser is on or near resonance transition. The AT line shape consists of the superposition of $|M_{J}|$ components which have been resolved for $G^{1}\\Pi_{g}(v=12, J=3,f)$. We find that the AT splittingis linearly proportional to $|M_{J}|$, which allows the excitation of molecules with a selected $|M_{J}|$ level. The AC Stark shift of the OODR line is observed when the coupling laser is detuned from the resonance transition.

Jan 1, 19990 citations

On the theory of double optical resonance

Pavel A Apanasevich, V. A. Khodovoǐ

Journal of Applied SpectroscopyMay 1, 19704 citations

Optical double resonance experiments

Alan Corney

Oxford University Press eBooksOct 5, 20060 citations

The Autler-Townes effect in hydrogen at low pressure

Albert M. F. Lau

The Autler‐Townes effect (also known as ac, optical or dynamical Stark splitting) on the Balmer‐α transition of hydrogen in 0.5–5 torr of helium is investigated. In the double optical resonance scheme, H(3p) is excited by absorption of two 243‐nm photons and a 656‐nm photon via the 2s resonant intermediate level. Calculated results show that in a Doppler‐free or a ‘‘Doppler‐reduced’’ beam configuration, the required intensity of the 656 nm laser (0.2 cm−1bandwidth) for observing the Autler‐Townes doublet has to be greater than 2×104 W/cm2 and 2×105 W/cm2 for a 243‐nm laser bandwidth of 0.1 cm−1 and 0.5 cm−1, respectively.The Autler‐Townes effect (also known as ac, optical or dynamical Stark splitting) on the Balmer‐α transition of hydrogen in 0.5–5 torr of helium is investigated. In the double optical resonance scheme, H(3p) is excited by absorption of two 243‐nm photons and a 656‐nm photon via the 2s resonant intermediate level. Calculated results show that in a Doppler‐free or a ‘‘Doppler‐reduced’’ beam configuration, the required intensity of the 656 nm laser (0.2 cm−1bandwidth) for observing the Autler‐Townes doublet has to be greater than 2×104 W/cm2 and 2×105 W/cm2 for a 243‐nm laser bandwidth of 0.1 cm−1 and 0.5 cm−1, respectively.

AIP conference proceedingsJan 1, 19880 citations

The Autler-Townes effect in hydrogen at low pressure

A. M. F. Lau

The author investigates the Autler-Townes effect (also known as AC, optical or dynamical Stark splitting) on the Balmer- alpha transition of hydrogen in 0.5-5 Torr of helium. In the double optical resonance scheme. H(3p) is excited by absorption of two 243 nm photons and a 656 nm photon via the 2s resonant intermediate level. Calculated results show that in a Doppler-free or a 'Doppler-reduced' beam configuration, the required intensity of the 656 nm laser (0.2 cm -1 bandwidth) for observation of the Autler-Townes doublet has to be greater than 2*10 4 and 2*10 5 W cm -2 for 243 nm laser bandwidths of 0.1 and 0.5 cm -1 , respectively.The author investigates the Autler-Townes effect (also known as AC, optical or dynamical Stark splitting) on the Balmer- alpha transition of hydrogen in 0.5-5 Torr of helium. In the double optical resonance scheme. H(3p) is excited by absorption of two 243 nm photons and a 656 nm photon via the 2s resonant intermediate level. Calculated results show that in a Doppler-free or a 'Doppler-reduced' beam configuration, the required intensity of the 656 nm laser (0.2 cm -1 bandwidth) for observation of the Autler-Townes doublet has to be greater than 2*10 4 and 2*10 5 W cm -2 for 243 nm laser bandwidths of 0.1 and 0.5 cm -1 , respectively.

Journal of Physics B Atomic and Molecular PhysicsAug 14, 19870 citations

G^{1}\\Pi_{g}

is prepared by the optical-optical double resonance (OODR) excitation. The OODR line is split in the presence of a third coupling laser, which couples the upper level to an another intermediate level when the coupling laser is on or near resonance transition. The AT line shape consists of the superposition of

|M_{J}|

components which have been resolved for

G^{1}\\Pi_{g}(v=12, J=3,f)

. We find that the AT splittingis linearly proportional to

|M_{J}|

, which allows the excitation of molecules with a selected

|M_{J}|

level. The AC Stark shift of the OODR line is observed when the coupling laser is detuned from the resonance transition.