Effect of phase fluctuations of a laser field on the Autler-Townes splitting

Experimental observation of the dependence of Autler-Townes splitting on the probe and coupling laser wave-number ratio in Doppler-broadened open molecular cascade systems

Angelos Lazoudis, Ergin H. Ahmed, L. Li +5 more

Physical Review AOct 7, 200819 citations

Effect of phase fluctuations of a laser field on the Autler-Townes splitting

Do Young Jeong, Hyun Min Park, K. S. Lee, Jong Min Lee, Bum Ku Rlee

Published Nov 1, 1996• 0 citations

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The dependence of the optical Autler-Townes effect on laser field phase fluctuations describable by a two-dimensional Markovian process (phase-diffusion model with a non-Lorentzian line shape) is investigated experimentally in atomic sodium. An intense cw laser tuned to near resonance with the ${3\mathrm{S}}_{1/2}$ (F=2, ${\mathrm{M}}_{\mathrm{F}}$ =2)\ensuremath{\rightarrow} ${3\mathrm{P}}_{3/2}$ (F=3, ${\mathrm{M}}_{\mathrm{F}}$ =3) transition was frequency modulated to generate phase fluctuations with the desired characteristics. A weak probe laser coupling to the 4 ${D}_{5/2}$ (F=4, ${M}_{F}$ =4) state was used to obtain the double-peaked optical Autler-Townes absorption profiles in order to investigate their dependencies on band shape, bandwidth, intensity, and detuning of the intense fluctuating laser field. Reversals of the peak-height asymmetry and reversion to normal asymmetry with increased detuning were observed and measured. Quantitative studies of the spectral widths and splittings of the peaks are also reported. Measured absorption profiles are in excellent agreement with calculations based on previous theoretical work.The dependence of the optical Autler-Townes effect on laser field phase fluctuations describable by a two-dimensional Markovian process (phase-diffusion model with a non-Lorentzian line shape) is investigated experimentally in atomic sodium. An intense cw laser tuned to near resonance with the ${3\mathrm{S}}_{1/2}$(F=2,${\mathrm{M}}_{\mathrm{F}}$=2)\ensuremath{\rightarrow}${3\mathrm{P}}_{3/2}$(F=3,${\mathrm{M}}_{\mathrm{F}}$=3) transition was frequency modulated to generate phase fluctuations with the desired characteristics. A weak probe laser coupling to the 4${D}_{5/2}$(F=4, ${M}_{F}$=4) state was used to obtain the double-peaked optical Autler-Townes absorption profiles in order to investigate their dependencies on band shape, bandwidth, intensity, and detuning of the intense fluctuating laser field. Reversals of the peak-height asymmetry and reversion to normal asymmetry with increased detuning were observed and measured. Quantitative studies of the spectral widths and splittings of the peaks are also reported. Measured absorption profiles are in excellent agreement with calculations based on previous theoretical work.

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Experimental observation of the dependence of Autler-Townes splitting on the probe and coupling laser wave-number ratio in Doppler-broadened open molecular cascade systems

Angelos Lazoudis, Ergin H. Ahmed, L. Li +5 more

We have investigated the effects of inhomogeneous Doppler line broadening on the Autler-Townes (AT) splitting in a three-level open molecular cascade system. For moderate Rabi frequencies in the range of $300--600\phantom{\rule{0.3em}{0ex}}\mathrm{MHz}$ , the fluorescence line shape from the uppermost level \ensuremath{\mid}3⟩ in this system depends strongly on the wave-number ratio of the two laser fields. However, the fluorescence spectrum of the intermediate level \ensuremath{\mid}2⟩ appears as expected. We provide a description of the conditions for optimally resolved AT splitting in terms of the ratio of the probe and coupling laser wave numbers, and the laser propagation geometry based on our theoretical analysis of the Doppler integral. The low threshold Rabi frequency region for Autler-Townes splitting is important for high-resolution Autler-Townes spectroscopy since the laser E-field amplitudes are modest in continuous-wave laser experiments.We have investigated the effects of inhomogeneous Doppler line broadening on the Autler-Townes (AT) splitting in a three-level open molecular cascade system. For moderate Rabi frequencies in the range of $300--600\phantom{\rule{0.3em}{0ex}}\mathrm{MHz}$, the fluorescence line shape from the uppermost level \ensuremath{\mid}3⟩ in this system depends strongly on the wave-number ratio of the two laser fields. However, the fluorescence spectrum of the intermediate level \ensuremath{\mid}2⟩ appears as expected. We provide a description of the conditions for optimally resolved AT splitting in terms of the ratio of the probe and coupling laser wave numbers, and the laser propagation geometry based on our theoretical analysis of the Doppler integral. The low threshold Rabi frequency region for Autler-Townes splitting is important for high-resolution Autler-Townes spectroscopy since the laser E-field amplitudes are modest in continuous-wave laser experiments.

Physical Review AOct 7, 200819 citations

{3\mathrm{S}}_{1/2}

(F=2,

{\mathrm{M}}_{\mathrm{F}}

=2)\ensuremath{\rightarrow}

{3\mathrm{P}}_{3/2}

(F=3,

{\mathrm{M}}_{\mathrm{F}}

=3) transition was frequency modulated to generate phase fluctuations with the desired characteristics. A weak probe laser coupling to the 4

{D}_{5/2}

(F=4,

{M}_{F}

=4) state was used to obtain the double-peaked optical Autler-Townes absorption profiles in order to investigate their dependencies on band shape, bandwidth, intensity, and detuning of the intense fluctuating laser field. Reversals of the peak-height asymmetry and reversion to normal asymmetry with increased detuning were observed and measured. Quantitative studies of the spectral widths and splittings of the peaks are also reported. Measured absorption profiles are in excellent agreement with calculations based on previous theoretical work.

300--600\phantom{\rule{0.3em}{0ex}}\mathrm{MHz}

, the fluorescence line shape from the uppermost level \ensuremath{\mid}3⟩ in this system depends strongly on the wave-number ratio of the two laser fields. However, the fluorescence spectrum of the intermediate level \ensuremath{\mid}2⟩ appears as expected. We provide a description of the conditions for optimally resolved AT splitting in terms of the ratio of the probe and coupling laser wave numbers, and the laser propagation geometry based on our theoretical analysis of the Doppler integral. The low threshold Rabi frequency region for Autler-Townes splitting is important for high-resolution Autler-Townes spectroscopy since the laser E-field amplitudes are modest in continuous-wave laser experiments.