Magneto-optical polarization rotation in a ladder-type atomic system for tunable offset locking

Parniak, Michał; Leszczyński, Adam; Wasilewski, Wojciech

doi:10.1063/1.4947104

Cited by 9 publications

(8 citation statements)

References 27 publications

(45 reference statements)

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“…Polarization spectroscopy provides a convenient signal for modulation-free laser frequency locking not only to the strong transitions within the D-lines of alkali atoms, but also to optical transitions between excited levels [32,26]. As was shown in Ref.…”

Section: Methodsmentioning

confidence: 89%

“…In our experiment, the ASE and blue fluorescence are recorded as a function of the optical frequency of either of the lasers while the frequency of the other laser remains fixed. Polarization spectroscopy provides a convenient signal for modulation-free laser frequency locking not only to the strong transitions within the D-lines of alkali atoms, but also to optical transitions between excited levels [32,26]. As was shown in Ref.…”

Section: Methodsmentioning

confidence: 99%

“…Typically, the collected fluorescence and applied laser light are spectrally separated, dramatically simplifying the detection procedure. Other popular methods are based on detecting absorption or polarization rotation of the applied laser light transmitted through an atomic sample [24,25,26]. Detection of new optical fields generated by ASE is less common [27].…”

Section: Two-photon Excitation: General Considerationsmentioning

confidence: 99%

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Amplified spontaneous emission at 523 μm in two-photon excited rubidium vapor

et al. 2017

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Abstract. Population inversion on the 5D5/2-6P3/2 transition in Rb atoms produced by cw laser excitation at different wavelengths has been analysed by comparing the generated mid-IR radiation at 5.23 μm originating from amplified spontaneous emission (ASE) and isotropic blue fluorescence at 420 nm. Using a novel method for detection of two photon excitation via ASE, we have observed directional coand counter-propagating emission at 5.23 μm. Evidence of a threshold-like characteristic is found in the ASE dependences on laser detuning and Rb number density. We find that the power dependences of the backward-and forwarddirected emission can be very similar and demonstrate a pronounced saturation characteristic, however their spectral dependences are not identical. The presented observations could be useful for enhancing efficiency of frequency mixing processes and new field generation in atomic media.

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Section: Methodsmentioning

confidence: 89%

Section: Methodsmentioning

confidence: 99%

Section: Two-photon Excitation: General Considerationsmentioning

confidence: 99%

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Amplified spontaneous emission at 523 μm in two-photon excited rubidium vapor

et al. 2017

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“…The Pump 2 laser at 776 nm is stabilized to the Pump 1 laser using modified version of the two-photon lock (see Fig. S1) presented in [61]. The modification employs technique called modulation transfer spectroscopy, to keep the Pumps 1&2 in two-photon resonance between levels |g and |c .…”

Section: Si Experimental Setup Detailsmentioning

confidence: 99%

Superradiant parametric conversion of spin waves

et al. 2019

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Atomic-ensemble spin waves carrying single-photon Fock states exhibit nonclassical many-body correlations in-between atoms. The same correlations are inherently associated with single-photon superradiance, forming the basis of a plethora of quantum light-matter interfaces. We devise a scheme allowing the preparation of spatially-structured superradiant states in the atomic two-photon cascade using spin-wave light storage. We thus show that long-lived atomic ground-state spin waves can be converted to photon pairs opening the way towards non-linear optics of spin waves via multi-wave mixing processes.Spatially extended atomic ensembles are a particularly versatile medium allowing generation and control of light with widely varying properties. Fulfilment of the phasematching (PM) condition facilitates efficient generation, storage and retrieval of single photons. Superradiance is inherently linked to the phase-matched emission and, in particular, spin waves (SW) that store information about light in the atomic coherence are superradiant Dicke states N −1/2 j e iKrj |g 1 . . . h j . . . g N [1]. In practice, the Λ scheme of atomic levels, which forms the basis of the Duan-Lukin-Cirac-Zoller quantum entanglement distribution protocol [2], is well-known for its capabilities to generate photon pairs with both non-trivial temporal [3] and spatially-multimode structure [4]. There, light is interfaced with a coherence between two metastable ground-state sublevels.An alternative ladder or diamond schemes allow generation of two-color photon pairs, and attract much attention [5-8] also for single-photon storage [9, 10] and in Rydberg-blockaded media [11,12]. In those cases the associated SWs lie between a ground state and an excited atomic state and are intermediate steps in the generation of a photon pair. More complex manipulations of those SWs, such as temporal [13][14][15][16][17] and spatial [18] mutli-SW beamsplitters demonstrated for ground-state SWs, remain elusive. Such control would allow SW-based enginieering of photon pair emission, possibly also extensible to deterministic quantum nonlinear optics based on Rydberg atoms [19].Here we show that the properties of a phase-matched cascaded atomic decay can be engineered via proper preparation of the atomic SW state. In particular, we treat the SW prepared in the Raman process as one of the fields participating in the parametric conversion, similarly as a pump field in a spontaneous parametric downconversion (SPDC) in nonlinear crystals [20]. Hitherto schemes necessarily required that the atom starts and ends the wave-mixing processes in the same ground state, as dictated by the principles of energy and momentum conservation. This requirement can be leveraged if the ensemble is first prepared in a superposition state, or in other words some coherence is present.We generate a strong atomic coherence (SW) between |g and |h via Raman interaction in the Λ scheme, as depicted in Fig. 1(a). The two pump fields (P1 and P2), as in Fig. 1(b), then transfer the coherence |g h|...

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“…In multi-level atomic systems coupled with several lasers, the excited-state transitions can also be used as locking signals with some variations on the techniques above. These include locks based on electromagnetically induced transparency (EIT) [33][34][35], fluorescence detection [36], and excited-state polarisation spectroscopy with [37] and without [38] a small magnetic field. As our experiments are done in the HPB regime, none of the aforementioned techniques are immediately suitable for our purposes.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous two-photon resonant optical laser locking (STROLLing) in the hyperfine Paschen–Back regime

et al. 2018

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We demonstrate a technique to lock simultaneously two laser frequencies to each step of a two-photon transition in the presence of a magnetic field sufficiently large to gain access to the hyperfine Paschen-Back regime. A ladder configuration with the 5, 5, and 5 terms in a thermal vapor of 87 atoms is used. The two lasers remain locked for more than 24 h. For the sum of the laser frequencies, which represents the stability of the two-photon lock, we measure a frequency instability of less than the Rb natural linewidth of 6 MHz for nearly all measured timescales.

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Magneto-optical polarization rotation in a ladder-type atomic system for tunable offset locking

Cited by 9 publications

References 27 publications

Amplified spontaneous emission at 523 μm in two-photon excited rubidium vapor

Amplified spontaneous emission at 523 μm in two-photon excited rubidium vapor

Superradiant parametric conversion of spin waves

Simultaneous two-photon resonant optical laser locking (STROLLing) in the hyperfine Paschen–Back regime

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