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Cappellini G, Mancini M, Pagano G, Lombardi P, Livi L, Siciliani de Cumis M, Cancio P, Pizzocaro M, Calonico D, Levi F, Sias C, Catani J, Inguscio M, Fallani L. Direct observation of coherent interorbital spin-exchange dynamics. Phys Rev Lett 2014; 113:120402. [PMID: 25279608 DOI: 10.1103/physrevlett.113.120402] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2014] [Indexed: 06/03/2023]
Abstract
We report on the first direct observation of fast spin-exchange coherent oscillations between different long-lived electronic orbitals of ultracold 173Yb fermions. We measure, in a model-independent way, the strength of the exchange interaction driving this coherent process. This observation allows us to retrieve important information on the interorbital collisional properties of 173Yb atoms and paves the way to novel quantum simulations of paradigmatic models of two-orbital quantum magnetism.
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Affiliation(s)
- G Cappellini
- LENS European Laboratory for Nonlinear Spectroscopy, Sesto Fiorentino 50019, Italy and INO-CNR Istituto Nazionale di Ottica del CNR, Sezione di Sesto Fiorentino, Sesto Fiorentino 50019, Italy
| | - M Mancini
- Department of Physics and Astronomy, University of Florence, Sesto Fiorentino 50019, Italy and INO-CNR Istituto Nazionale di Ottica del CNR, Sezione di Sesto Fiorentino, Sesto Fiorentino 50019, Italy
| | - G Pagano
- INO-CNR Istituto Nazionale di Ottica del CNR, Sezione di Sesto Fiorentino, Sesto Fiorentino 50019, Italy and Scuola Normale Superiore di Pisa, Pisa 56126, Italy
| | - P Lombardi
- LENS European Laboratory for Nonlinear Spectroscopy, Sesto Fiorentino 50019, Italy
| | - L Livi
- Department of Physics and Astronomy, University of Florence, Sesto Fiorentino 50019, Italy
| | - M Siciliani de Cumis
- INO-CNR Istituto Nazionale di Ottica del CNR, Sezione di Sesto Fiorentino, Sesto Fiorentino 50019, Italy
| | - P Cancio
- LENS European Laboratory for Nonlinear Spectroscopy, Sesto Fiorentino 50019, Italy and Department of Physics and Astronomy, University of Florence, Sesto Fiorentino 50019, Italy and INO-CNR Istituto Nazionale di Ottica del CNR, Sezione di Sesto Fiorentino, Sesto Fiorentino 50019, Italy
| | - M Pizzocaro
- INRIM Istituto Nazionale di Ricerca Metrologica, Torino 10135, Italy
| | - D Calonico
- INRIM Istituto Nazionale di Ricerca Metrologica, Torino 10135, Italy
| | - F Levi
- INRIM Istituto Nazionale di Ricerca Metrologica, Torino 10135, Italy
| | - C Sias
- LENS European Laboratory for Nonlinear Spectroscopy, Sesto Fiorentino 50019, Italy and INO-CNR Istituto Nazionale di Ottica del CNR, Sezione di Sesto Fiorentino, Sesto Fiorentino 50019, Italy
| | - J Catani
- LENS European Laboratory for Nonlinear Spectroscopy, Sesto Fiorentino 50019, Italy and INO-CNR Istituto Nazionale di Ottica del CNR, Sezione di Sesto Fiorentino, Sesto Fiorentino 50019, Italy
| | - M Inguscio
- LENS European Laboratory for Nonlinear Spectroscopy, Sesto Fiorentino 50019, Italy and Department of Physics and Astronomy, University of Florence, Sesto Fiorentino 50019, Italy and INRIM Istituto Nazionale di Ricerca Metrologica, Torino 10135, Italy
| | - L Fallani
- LENS European Laboratory for Nonlinear Spectroscopy, Sesto Fiorentino 50019, Italy and Department of Physics and Astronomy, University of Florence, Sesto Fiorentino 50019, Italy and INO-CNR Istituto Nazionale di Ottica del CNR, Sezione di Sesto Fiorentino, Sesto Fiorentino 50019, Italy
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2
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Galli I, Bartalini S, Cancio P, Cappelli F, Giusfredi G, Mazzotti D, Akikusa N, Yamanishi M, De Natale P. Mid-infrared frequency comb for broadband high precision and sensitivity molecular spectroscopy. Opt Lett 2014; 39:5050-3. [PMID: 25166071 DOI: 10.1364/ol.39.005050] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
We report on the experimental demonstration of the metrological and spectroscopic performances of a mid-infrared comb generated by a nonlinear downconversion process from a Ti:sapphire-based near-infrared comb. A quantum cascade laser at 4330 nm was phase-locked to a single tooth of this mid-infrared comb and its frequency-noise power spectral density was measured. The mid-infrared comb itself was also used as a multifrequency highly coherent source to perform ambient air direct comb spectroscopy with the Vernier technique, by demultiplexing it with a high-finesse Fabry-Perot cavity.
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3
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Cancio P, Galli I, Bartalini S, Giusfredi G, Mazzotti D, De Natale P. Saturated-Absorption Cavity Ring-Down (SCAR) for High-Sensitivity and High-Resolution Molecular Spectroscopy in the Mid IR. Springer Series in Optical Sciences 2014. [DOI: 10.1007/978-3-642-40003-2_4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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4
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Galli I, Cappelli F, Cancio P, Giusfredi G, Mazzotti D, Bartalini S, De Natale P. High-coherence mid-infrared frequency comb. Opt Express 2013; 21:28877-85. [PMID: 24514401 DOI: 10.1364/oe.21.028877] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
We report on the generation of a frequency comb around 4330 nm with an unprecedented coherence of the single teeth. Generating the comb within a Ti:sapphire laser cavity by a difference-frequency process and using a phase-lock scheme based on direct digital synthesis, we achieve a tooth linewidth of 2.0 kHz in a 1-s timescale (750 Hz in 20 ms). The generated per-tooth power of 1 μW ranks this comb among the best ever realized in the mid-infrared in terms of power spectral density.
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Cancio P, Bartalini S, De Rosa M, Giusfredi G, Mazzotti D, Maddaloni P, Vitiello M, De Natale P. Atomic and molecular spectroscopy with optical-frequency-comb-referenced IR coherent sources. EPJ Web of Conferences 2013. [DOI: 10.1051/epjconf/20135702003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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6
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Borri S, Galli I, Cappelli F, Bismuto A, Bartalini S, Cancio P, Giusfredi G, Mazzotti D, Faist J, De Natale P. Direct link of a mid-infrared QCL to a frequency comb by optical injection. Opt Lett 2012; 37:1011-1013. [PMID: 22446207 DOI: 10.1364/ol.37.001011] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
A narrow-linewidth comb-linked nonlinear source is used as master radiation to injection lock a room-temperature mid-infrared quantum cascade laser (QCL). This process leads to a direct lock of the QCL to the optical frequency comb, providing the unique features of narrow linewidth, absolute frequency, higher output power, and wide mode-hop-free tunability. The QCL reproduces the injected radiation within more than 94%, with a reduction of the frequency-noise spectral density by 3 to 4 orders of magnitude up to about 100 kHz, and a linewidth narrowing from a few MHz to 20 kHz.
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Affiliation(s)
- S Borri
- Istituto Nazionale di Ottica (INO), Consiglio Nazionale delle Richerche (CNR), Firenze FI, Italy.
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7
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Galli I, Bartalini S, Borri S, Cancio P, Mazzotti D, De Natale P, Giusfredi G. Molecular gas sensing below parts per trillion: radiocarbon-dioxide optical detection. Phys Rev Lett 2011; 107:270802. [PMID: 22243298 DOI: 10.1103/physrevlett.107.270802] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2011] [Indexed: 05/31/2023]
Abstract
Radiocarbon ((14)C) concentrations at a 43 parts-per-quadrillion level are measured by using saturated-absorption cavity ringdown spectroscopy by exciting radiocarbon-dioxide ((14)C(16)O(2)) molecules at the 4.5 μm wavelength. The ultimate sensitivity limits of molecular trace gas sensing are pushed down to attobar pressures using a comb-assisted absorption spectroscopy setup. Such a result represents the lowest pressure ever detected for a gas of simple molecules. The unique sensitivity, the wide dynamic range, the compactness, and the relatively low cost of this table-top setup open new perspectives for ^{14}C-tracing applications, such as radiocarbon dating, biomedicine, or environmental and earth sciences. The detection of other very rare molecules can be pursued as well thanks to the wide and continuous mid-IR spectral coverage of the described setup.
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Affiliation(s)
- I Galli
- Istituto Nazionale di Ottica-CNR (INO-CNR) and European Laboratory for Non-Linear Spectroscopy (LENS, Sesto Fiorentino, Italy
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Consolino L, Giusfredi G, De Natale P, Inguscio M, Cancio P. Optical frequency comb assisted laser system for multiplex precision spectroscopy. Opt Express 2011; 19:3155-3162. [PMID: 21369137 DOI: 10.1364/oe.19.003155] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A laser system composed of two lasers phase-locked onto an Optical Frequency Comb Synthesizer (OFCS), operating around 1083 nm, was developed. An absolute frequency precision of 6x10(-13) at 1s, limited by the OFCS, was measured with a residual rms phase-noise of 71 mrad and 87 mrad for the two phase-locks, respectively. Multiplex spectroscopy on 1083 nm Helium transitions with this set-up is demonstrated. Generalization of this system to a larger number of OFCS assisted laser sources for wider frequency separations, even in other spectral regions, is discussed.
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Affiliation(s)
- L Consolino
- European Laboratory for Non-Linear Spectroscopy (LENS) and Dipartimento di Fisica,Universitá degli Studi di Firenze, Via N. Carrara 1, 50019-Sesto Fiorentino (FI), Italy.
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9
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Galli I, Bartalini S, Borri S, Cancio P, Giusfredi G, Mazzotti D, De Natale P. Ti:sapphire laser intracavity difference-frequency generation of 30 mW cw radiation around 4.5 μm. Opt Lett 2010; 35:3616-3618. [PMID: 21042368 DOI: 10.1364/ol.35.003616] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A cw mid-IR coherent source based on difference-frequency generation is designed and characterized. For mid-IR generation, a periodically poled MgO:LiNbO(3) crystal is placed inside a compact Ti:sapphire laser cavity. This provides high-power pump radiation for the nonlinear process. Optical injection by an external-cavity diode laser ensures single-frequency operation of the Ti:sapphire laser, while signal radiation is provided by a fiber-amplified Nd:YAG laser. Mid-IR radiation can be generated with 3850-4540 nm tuning range, narrow linewidth, Cs-standard traceability, and TEM(00) spatial mode. 30 mW power is obtained at 4510 nm.
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Affiliation(s)
- I Galli
- Isitituto Nazionale di Ottica (INO)-CNR, Largo Fermi 6, 50125 Firenze FI, Italy
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10
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Giusfredi G, Bartalini S, Borri S, Cancio P, Galli I, Mazzotti D, De Natale P. Saturated-absorption cavity ring-down spectroscopy. Phys Rev Lett 2010; 104:110801. [PMID: 20366460 DOI: 10.1103/physrevlett.104.110801] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2009] [Indexed: 05/29/2023]
Abstract
We report on a novel approach to cavity ring-down spectroscopy with the sample gas in saturated-absorption regime. This technique allows us to decouple and simultaneously retrieve the empty-cavity background and absorption signal, by means of a theoretical model that we developed and tested. The high sensitivity and frequency precision for spectroscopic applications are exploited to measure, for the first time, the hyperfine structure of an excited vibrational state of 17O12C16O in natural abundance with an accuracy of a few parts in 10{-11}.
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Affiliation(s)
- G Giusfredi
- Istituto Nazionale di Ottica (INO)-CNR, Largo Fermi 6, 50125 Firenze FI, Italy
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11
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Bartalini S, Borri S, Cancio P, Castrillo A, Galli I, Giusfredi G, Mazzotti D, Gianfrani L, De Natale P. Observing the intrinsic linewidth of a quantum-cascade laser: beyond the Schawlow-Townes limit. Phys Rev Lett 2010; 104:083904. [PMID: 20366933 DOI: 10.1103/physrevlett.104.083904] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2009] [Indexed: 05/29/2023]
Abstract
A comprehensive investigation of the frequency-noise spectral density of a free-running midinfrared quantum-cascade laser is presented for the first time. It provides direct evidence of the leveling of this noise down to a white-noise plateau, corresponding to an intrinsic linewidth of a few hundred hertz. The experiment is in agreement with the most recent theory on the fundamental mechanism of line broadening in quantum-cascade lasers, which provides a new insight into the Schawlow-Townes formula and predicts a narrowing beyond the limit set by the radiative lifetime of the upper level.
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Affiliation(s)
- S Bartalini
- Istituto Nazionale di Ottica (INO)-CNR, Largo Fermi 6, 50125 Firenze FI, Italy.
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12
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Galli I, Bartalini S, Cancio P, Giusfredi G, Mazzotti D, De Natale P. Ultra-stable, widely tunable and absolutely linked mid-IR coherent source. Opt Express 2009; 17:9582-9587. [PMID: 19506606 DOI: 10.1364/oe.17.009582] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We report on a new coherent source that, using a phase-lock scheme to an optical frequency-comb synthesizer, achieves a 10-Hz intrinsic linewidth, is tunable from 4 to 4.5 microm with a presettable absolute frequency and, when coupled to a high-finesse cavity, can provide a short-term absorption sensitivity of 1.3 x 10(-11) cm(-1)Hz,(-1/2). These unique spectral features make this source a precise tool for molecular physics.
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Affiliation(s)
- I Galli
- Istituto Nazionale di Ottica Applicata- CNR, Firenze, FI, Italy
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13
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Borri S, Bartalini S, Galli I, Cancio P, Giusfredi G, Mazzotti D, Castrillo A, Gianfrani L, De Natale P. Lamb-dip-locked quantum cascade laser for comb-referenced IR absolute frequency measurements. Opt Express 2008; 16:11637-11646. [PMID: 18648485 DOI: 10.1364/oe.16.011637] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2008] [Accepted: 06/20/2008] [Indexed: 05/26/2023]
Abstract
The frequency of a DFB quantum cascade laser (QCL) emitting at 4.3 microm has been long-term stabilized to the Lamb-dip center of a CO2 ro-vibrational transition by means of first-derivative locking to the saturated absorption signal. Thanks to the non-linear sum-frequency generation (SFG) process with a fiber-amplified Nd:YAG laser, the QCL mid-infrared (IR) radiation has been linked to an optical frequency-comb synthesizer (OFCS) and its absolute frequency counted with a kHz-level precision and an overall uncertainty of 75 kHz.
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Affiliation(s)
- S Borri
- Istituto Nazionale di Ottica Applicata, CNR, Firenze, Italy
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14
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Bartalini S, Cancio P, Giusfredi G, Mazzotti D, De Natale P, Borri S, Galli I, Leveque T, Gianfrani L. Frequency-comb-referenced quantum-cascade laser at 4.4 microm. Opt Lett 2007; 32:988-90. [PMID: 17375177 DOI: 10.1364/ol.32.000988] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
We report what we believe to be the first absolute frequency measurement performed using a quantum-cascade laser (QCL) referenced to an optical frequency comb synthesizer (OFCS). A QCL at 4.43 microm has been used for producing near-infrared radiation at 858 nm by means of sum-frequency generation with a Nd:YAG source in a periodically poled lithium niobate nonlinear crystal. The absolute frequency of the QCL source has been measured by detecting the beat note between the sum frequency and a diode laser at the same wavelength, while both the Nd:YAG and the diode laser were referenced to the OFCS. Doppler-broadened line profiles of (13)CO(2) molecular transitions have been recorded with such an absolute frequency reference.
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Affiliation(s)
- S Bartalini
- CNR-Istituto Nazionale di Ottica Applicata, Firenze FI, Italy
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15
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Mazzotti D, Cancio P, Giusfredi G, De Natale P, Prevedelli M. Frequency-comb-based absolute frequency measurements in the mid-infrared with a difference-frequency spectrometer. Opt Lett 2005; 30:997-9. [PMID: 15906982 DOI: 10.1364/ol.30.000997] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
We demonstrate the possibility of extending the well-established metrological performance of optical frequency-comb synthesizers to the mid-IR region by phase locking the pump and signal lasers of a difference-frequency source to two near-IR teeth of an optical comb. An uncertainty of 800 Hz (1.1 x 10(-11)) in the absolute frequencies of CO2 transitions near 4.2 microm has been measured by cavity-enhanced saturated-absorption spectroscopy. Prospects for the creation of a new dense set of high-quality molecular frequency standards in the IR are discussed.
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Affiliation(s)
- D Mazzotti
- Istituto Nazionale di Ottica Applicata, Largo Fermi 6, 50125 Florence, Italy.
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Ferrari G, Cancio P, Drullinger R, Giusfredi G, Poli N, Prevedelli M, Toninelli C, Tino GM. Precision frequency measurement of visible intercombination lines of strontium. Phys Rev Lett 2003; 91:243002. [PMID: 14683113 DOI: 10.1103/physrevlett.91.243002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2003] [Indexed: 05/24/2023]
Abstract
We report the direct frequency measurement of the visible 5s(2) 1S0-5s5p 3P1 intercombination line of strontium that is considered a possible candidate for a future optical-frequency standard. The frequency of a cavity-stabilized laser is locked to the saturated fluorescence in a thermal Sr atomic beam and is measured with an optical-frequency comb generator referenced to the SI second through a global positioning system signal. The 88Sr transition is measured to be at 434 829 121 311 (10) kHz. We measure also the 88Sr-86Sr isotope shift to be 163 817.4 (0.2) kHz.
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Affiliation(s)
- G Ferrari
- Dipartimento di Fisica and LENS, Università di Firenze, INFM-UdR Firenze, Polo Scientifico, 50019 Sesto Fiorentino, Italy
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17
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Giusfredi G, Mazzotti D, Cancio P, De Natale P. Spatial mode control of radiation generated by frequency difference in periodically poled crystals. Phys Rev Lett 2001; 87:113901. [PMID: 11531523 DOI: 10.1103/physrevlett.87.113901] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2001] [Revised: 06/12/2001] [Indexed: 05/23/2023]
Abstract
We demonstrate the possibility to control the spatial mode of a narrow-linewidth, continuous-wave, infrared radiation beam generated by difference frequency in a periodically poled crystal. This can be achieved by acting directly on a few experimental parameters. We show that hollow beams can be generated. A numerical routine has been developed and results agree with experimental observations, without requiring any free parameters. The relevance of these results for high-resolution spectroscopy and atom manipulation is discussed.
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Affiliation(s)
- G Giusfredi
- Istituto Nazionale di Ottica Applicata (INOA), Largo Fermi 6, I-50125 Firenze, Italy
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18
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Mazzotti D, Cancio P, Giusfredi G, Inguscio M, De Natale P. Search for exchange-antisymmetric states for spin-0 particles at the 10(-11) level. Phys Rev Lett 2001; 86:1919-1922. [PMID: 11289820 DOI: 10.1103/physrevlett.86.1919] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2000] [Indexed: 05/23/2023]
Abstract
We set a new upper limit of 1.7x10(-11) to the probability that two spin-0 16O nuclei are in forbidden exchange-antisymmetric states, testing the validity of fundamental principles of quantum mechanics. A newly designed difference-frequency spectrometer is used to look for the existence of these states. The experimental test was performed by tuning the spectrometer across a molecular transition of 12C 16O (2) belonging to the rovibrational band at 4.25 microm, connecting the forbidden states (00(0)0,J = 25) and (00(0)1,J = 26).
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Affiliation(s)
- D Mazzotti
- Instituto Nazionale di Ottica Applicata, Largo E. Fermi, Firenze, Italy
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19
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Escribano R, Bermejo D, Calvente JL, Cancio P, Maki AG. The Stimulated Raman Spectrum of Symmetric 13C Cyanogen, 13C2N2. J Mol Spectrosc 1999; 193:174-182. [PMID: 9878498 DOI: 10.1006/jmsp.1998.7722] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
The Raman spectrum of cyanogen 13C214N2 has been investigated at nearly Doppler resolution by means of a stimulated Raman technique. The regions around the bandheads of the nu1 (2260 cm-1) and nu2 (835 cm-1) vibrations have been recorded. Besides the fundamentals, hot bands arising from v5 = 1-3 and v4 = 1 have been observed. A number of strong perturbations have been detected. The spectra have been analyzed and rotational constants for the excited states have been obtained. Computer simulations of the Raman contours have been carried out as a test of the assignments. A few weak DeltaJ = -2 lines have also been observed in the nu1 region.
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Affiliation(s)
- R Escribano
- Instituto de Estructura de la Materia, C.S.I.C., Serrano 123, Madrid, 28006, Spain
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Bermejo D, Cancio P, Di Lonardo G, Fusina L. High resolution Raman spectroscopy from vibrationally excited states populated by a stimulated Raman process: 2ν2–ν2 of 12C2H2 and 13C2H2. J Chem Phys 1998. [DOI: 10.1063/1.476140] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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21
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Bermejo D, Santos J, Cancio P, Fernández‐Sánchez JM, Montero S. Vibrational–torsional coupling. High‐resolution stimulated Raman spectrum of the ν3 band of ethane (12C2H6). J Chem Phys 1992. [DOI: 10.1063/1.463531] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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