Dual Ti:sapphire comb lasers by a fiber laser pumping scheme and a hand-sized optical frequency reference

Liu, Tze Wei; Wu, C.; Hsu, Yuan-Hao; Wang, Cheng

doi:10.1007/s00340-014-5885-z

Cited by 4 publications

(1 citation statement)

References 26 publications

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“…Our previous investigations pointed out that the cesium atom 6S-8S transition was a good optical frequency reference due to its excellent spectral features [14]. The applications to Ti:sapphire comb lasers were also demonstrated [15,16] using a hand-size optical reference [17]. Therefore, further comparisons of the corresponding transition frequencies under different cell conditions are important and some comparisons were carried out in our previous experiment [4].…”

Section: Laser Stabilization and Comparison Of Cesium Cellsmentioning

confidence: 99%

Quantum interference in two-photon spectroscopy for laser stabilization and cesium-cell comparison

Liu

Cheng

2015

Phys. Rev. A

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An alternate method of two-photon spectroscopy is presented where cesium atoms interact with a phase-modulated laser beam. Doppler-free two-photon spectroscopy of the cesium atom 6S 8S hyperfine transition was used to experimentally demonstrate quantum interfered two-photon spectra. We calculated the photon-atom interaction by second-order perturbation theory and assumed that the one-photon frequency is detuned far from any intermediate state. Then we calculated the relative transition rates of all spectral lines resolved by the laser carrier and sidebands. A physical picture of multi-pathway quantum interference in the frequency domain is given that explains the unusual line strength, based on the trick that a phasemodulated laser beam can be decomposed into a series of coherent and collinear laser modes (carrier and sidebands). For all pairs of modes in which the sum frequency of each pair was on resonance with the cesium atom 6S 8S transition, the superposition of all pathways induced by the different mode pairs resulted in a destructive interference, which then leads to a lack of absorption. We have shown in this paper that our calculation agrees very well with our experimental results in terms of the relative interfered line strengths, which were functions of modulation depth. We further discuss some related issues concerning laser stabilization and we demonstrate an approach for simultaneously comparing two cesium cells. DOI:PACS number(s): 06.20.-f, 32.30.-r, 39.30.+w.

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