High resolution atomic coherent control via spectral phase manipulation of an optical frequency comb

Sem informaçãoWe demonstrate high resolution coherent control of cold atomic rubidium utilizing spectral phase manipulation of a femtosecond optical frequency comb. Transient coherent accumulation is directly manifested by the enhancement of signal amplitude and spectral resolution via the pulse number. The combination of frequency comb technology and spectral phase manipulation enables coherent control techniques to enter a new regime with natural linewidth resolution. © 2006 The American Physical Society.We demonstrate high resolution coherent control of cold atomic rubidium utilizing spectral phase manipulation of a femtosecond optical frequency comb. Transient coherent accumulation is directly manifested by the enhancement of signal amplitude and spectral resolution via the pulse number. The combination of frequency comb technology and spectral phase manipulation enables coherent control techniques to enter a new regime with natural linewidth resolution.We demonstrate high resolution coherent control of cold atomic rubidium utilizing spectral phase manipulation of a femtosecond optical frequency comb. Transient coherent accumulation is directly manifested by the enhancement of signal amplitude and spectral resolution via the pulse number. The combination of frequency comb technology and spectral phase manipulation enables coherent control techniques to enter a new regime with natural linewidth resolution.961514Sem informaçãoSem informaçãoSem informaçãoUdem, Th., Holzwarth, R., Hänsch, T.W., (2002) Nature (London), 416, p. 233. , NATUAS. 0028-0836. 10.1038/416233aCundiff, S.T., Ye, J., (2003) Rev. Mod. Phys., 75, p. 325. , RMPHAT 0034-6861 10.1103/RevModPhys.75.325Marian, A., (2004) Science, 306, p. 2063. , SCIEAS 0036-8075 10.1126/science.1105660Marian, A., (2005) Phys. Rev. Lett., 95, p. 023001. , PRLTAO 0031-9007 10.1103/PhysRevLett.95.023001Diddams, S.A., (2001) Science, 293, p. 825. , SCIEAS 0036-8075 10.1126/science.1061171Ye, J., Ma, L.-S., Hall, J.L., (2001) Phys. Rev. Lett., 87, p. 270801. , PRLTAO 0031-9007 10.1103/PhysRevLett.87.270801Holman, K.W., (2005) Opt. Lett., 30, p. 1225. , OPLEDP 0146-9592 10.1364/OL.30.001225Jones, R.J., (2005) Phys. Rev. Lett., 94, p. 193201. , PRLTAO 0031-9007 10.1103/PhysRevLett.94.193201Gohle, C., (2005) Nature (London), 436, p. 234. , NATUAS 0028-0836 10.1038/nature03851Kuklinski, J.R., (1989) Phys. Rev. A, 40, p. 6741. , PLRAAN 1050-2947 10.1103/PhysRevA.40.6741Broers, B., Van Linden Van Den Heuvell, H.B., Noordam, L.D., (1992) Phys. Rev. Lett., 69, p. 2062. , PRLTAO 0031-9007 10.1103/PhysRevLett.69.2062Meshulach, D., Silberberg, Y., (1998) Nature (London), 396, p. 239. , NATUAS 0028-0836 10.1038/24329Balling, P., Maas, D.J., Noordam, L.D., (1994) Phys. Rev. A, 50, p. 4276. , PLRAAN 1050-2947 10.1103/PhysRevA.50.4276Chatel, B., (2003) Phys. Rev. A, 68, p. 041402. , PLRAAN 1050-2947 10.1103/PhysRevA.68.041402Oron, D., (2002) Phys. Rev. Lett., 88, p. 063004. , PRLTAO 0031-9007 10.1103/PhysRevLett.88.063004Salzmann, W., (2006) Phys. Rev. A, 73, p. 023414. , PLRAAN 1050-2947 10.1103/PhysRevA.73.023414Felinto, D., Acioli, L.H., Vianna, S.S., (2004) Phys. Rev. A, 70, p. 043403. , PLRAAN 1050-2947 10.1103/PhysRevA.70.043403Martinez, O.E., (1987) IEEE J. Quantum Electron., 23, p. 59. , IEJQA7 0018-9197 10.1109/JQE.1987.1073201Yoon, T.H., (2001) Phys. Rev. A, 63, p. 011402. , PLRAAN 1050-2947 10.1103/PhysRevA.63.011402Vala, J., (2001) Phys. Rev. A, 63, p. 013412. , PLRAAN 1050-2947 10.1103/PhysRevA.63.013412We thank funding support from ONR, NSF, and NIST

Mid-Infrared Optical Frequency Combs based on Difference Frequency Generation for Molecular Spectroscopy

Mid-infrared femtosecond optical frequency combs were produced by difference frequency generation of the spectral components of a near-infrared comb in a 3-mm-long MgO:PPLN crystal. We observe strong pump depletion and 9.3 dB parametric gain in the 1.5 \mu m signal, which yields powers above 500 mW (3 \mu W/mode) in the idler with spectra covering 2.8 \mu m to 3.5 \mu m. Potential for broadband, high-resolution molecular spectroscopy is demonstrated by absorption spectra and interferograms obtained by heterodyning two combs.Comment: 11 pages, 8 figure

Broadband 2.12 GHz Ti : sapphire laser compressed to 5.9 femtoseconds using MIIPS

CAPES - COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIORFAPESP - FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULOCNPQ - CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICOWe report a self-starting prismless femtosecond Ti:sapphire ring laser whose repetition rate has been gradually increased from 1 to 2.12 GHz. A broadband spectrum extending from 650 to 1040 nm, in which 17% of the intracavity power is generated in a single-pass through the crystal, is preserved in spite of the reduction in peak power. An average power of 0.95 W was obtained for 7.5 W of pump power, with very stable operation verified over 22 hours. Pulses from this laser have been fully characterized in spectral phase, and then compressed to 5.9 femtoseconds using multiphoton intrapulse interference phase scan (MIIPS).We report a self-starting prismless femtosecond Ti:sapphire ring laser whose repetition rate has been gradually increased from 1 to 2.12 GHz. A broadband spectrum extending from 650 to 1040 nm, in which 17% of the intracavity power is generated in a single-pass through the crystal, is preserved in spite of the reduction in peak power. An average power of 0.95 W was obtained for 7.5 W of pump power, with very stable operation verified over 22 hours. Pulses from this laser have been fully characterized in spectral phase, and then compressed to 5.9 femtoseconds using multiphoton intrapulse interference phase scan (MIIPS).16141003310038CAPES - COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIORFAPESP - FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULOCNPQ - CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICOCAPES - COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIORFAPESP - FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULOCNPQ - CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICOSem informaçãoSem informaçãoSem informaçãoG. T. Nogueira acknowledges a scholarship from CAPES. F. C. Cruz ([email protected]) acknowledges financial support from FAPESP, CEPOF, and CNPq. The MSU team acknowledges partial funding for the project from the National Science Foundation

Coherent Quantum Engineering of Free-Space Laser Cooling

We perform a quantitative analysis of the cooling dynamics of three-level atomic systems interacting with two distinct lasers. Employing sparse-matrix techniques, we find numerical solutions to the fully quantized master equation in steady state. Our method allows straightforward determination of laser-cooling temperatures without the ambiguity often accompanied by semiclassical calculations, and more quickly than non-sparse techniques. Our calculations allow us to develop an understanding of the regimes of cooling, as well as a qualitative picture of the mechanism, related to the phenomenon of electromagnetically induced transparency. Effects of the induced asymmetric Fano-type lineshapes affect the detunings required for optimum cooling, as well as the predicted minimum temperatures which can be lower than the Doppler limit for either transition.Comment: 5 pages, 3 figure

Versatile silicon-waveguide supercontinuum for coherent mid-infrared spectroscopy

Infrared spectroscopy is a powerful tool for basic and applied science. The molecular spectral fingerprints in the 3 um to 20 um region provide a means to uniquely identify molecular structure for fundamental spectroscopy, atmospheric chemistry, trace and hazardous gas detection, and biological microscopy. Driven by such applications, the development of low-noise, coherent laser sources with broad, tunable coverage is a topic of great interest. Laser frequency combs possess a unique combination of precisely defined spectral lines and broad bandwidth that can enable the above-mentioned applications. Here, we leverage robust fabrication and geometrical dispersion engineering of silicon nanophotonic waveguides for coherent frequency comb generation spanning 70 THz in the mid-infrared (2.5 um to 6.2 um). Precise waveguide fabrication provides significant spectral broadening and engineered spectra targeted at specific mid-infrared bands. We use this coherent light source for dual-comb spectroscopy at 5 um.Comment: 26 pages, 5 figure

Line intensity measurements of methane’s ν3-band using a cw-OPO

We report on absolute line strength measurements of P(1), R(0) and R(1) singlet lines in the 3:3 μm ν3 (C–H stretching) band of methane 12CH4 at referencetemperature T = 296 K. Line strength measurements are performed at low pressure (P <1 Torr) using direct absorption spectroscopy technique based on a widely tunable continuous-wave singly resonant optical parametric oscillator. The 1σ overall accuracy in line strength determinations ranges between 7 and 8 % mostly limited by pressure and frequency measurements. A comparison with previous reported values is made. Our results show good agreement with the HITRAN 2012 database