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Optics Communications

Synchronized quantum beat spectroscopy using periodic impact excitations with CW mode-locked laser pulses

Yukio Fukuda, J. Hayashi, Kazuki KONDO, T. Hashi

Published Sep 1, 1981• 32 citations
Publisher
DOI
10.1016/0030-4018(81)90065-1

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Pressure shifts of the hyperfine splitting in Na 3(2)S((1/2)) that are due to buffer gases have been measured for the first time to our knowledge by all-optical means using the method of synchronized-quantum-beat spectroscopy reported previously [Y. Fukuda et al., Opt. Commun. 38, 357 (1981)]. The substate coherence is excited and detected with amplitude-modulated mode-locked laser pulses tuned to the D(1) line (pulse-repetition frequency, f(p); modulation frequency, f(m)), and the resonances observed at f(0) = nf(p) + ńf(m), (n and n' are integers) are used for the measurement. The pressure-shift coefficients obtained at 210 degrees C are 82, 61, -1, and -47 Hz/Torr for He, N(2), Ar, and Kr, respectively, within an accuracy of +/-3 Hz/Torr.

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We report on a new type of sublevel echoes, synchronized-quantum-beat (SQB) echoes, generated by a successive application of two resonant light-pulse trains. The echoes are selectively generated for a sublevel pair whose frequency splitting is equal to an integral multiple of the repetition frequency of the light pulses. By using mode locked laser pulses tuned to the D(1) transition, we observed SQB echoes (and free induction decay) for all Zeeman and hyperfine transitions in the ground state of sodium atoms in low magnetic fields.

Optics Letters•Dec 1, 1983•15 citations
The method of Synchronized Quantum Beat Spectroscopy has been improved by introducing the amplitude modulation on the excitation pulse train. By using an amplitude-modulated train of picosecond pulses from a cw mode-locked dye laser, we obtain resonance enhancement of the substate coherence (quantum beat) at f 0 = n f p + n ' f m ( n , n ' : integer, f 0 : sublevel splitting, f p : pulse repetition frequency, f m : modulation frequency), which can be detected by monitoring the optical anisotropy due to the substate coherence. Resonances can be obtained in the frequency domain by sweeping f m . Pressure shift coefficients of the hyperfine splitting in Na 3 2 S 1/2 are measured to be 82, 61, -1 and -47 Hz/Torr for He, N 2 , Ar and Kr, respectively, within an accuracy of ±3 Hz/Torr.
Pressure shifts of the hyperfine splitting in Na 3(2)S((1/2)) that are due to buffer gases have been measured for the first time to our knowledge by all-optical means using the method of synchronized-quantum-beat spectroscopy reported previously [Y. Fukuda et al., Opt. Commun. 38, 357 (1981)]. The substate coherence is excited and detected with amplitude-modulated mode-locked laser pulses tuned to the D(1) line (pulse-repetition frequency, f(p); modulation frequency, f(m)), and the resonances observed at f(0) = nf(p) + ńf(m), (n and n' are integers) are used for the measurement. The pressure-shift coefficients obtained at 210 degrees C are 82, 61, -1, and -47 Hz/Torr for He, N(2), Ar, and Kr, respectively, within an accuracy of +/-3 Hz/Torr.
We report on a new type of sublevel echoes, synchronized-quantum-beat (SQB) echoes, generated by a successive application of two resonant light-pulse trains. The echoes are selectively generated for a sublevel pair whose frequency splitting is equal to an integral multiple of the repetition frequency of the light pulses. By using mode locked laser pulses tuned to the D(1) transition, we observed SQB echoes (and free induction decay) for all Zeeman and hyperfine transitions in the ground state of sodium atoms in low magnetic fields.