The Experts below are selected from a list of 267 Experts worldwide ranked by ideXlab platform
Richard J. Warburton - One of the best experts on this subject based on the ideXlab platform.
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Transform-limited single photons from a single quantum dot
arXiv:cond-mat, 2013Co-Authors: Andreas V. Kuhlmann, Jonathan H. Prechtel, J. Houel, Arne Ludwig, Dirk Reuter, Andreas D. Wieck, Richard J. WarburtonAbstract:A semiconductor quantum dot mimics a two-level atom. Performance as a single photon source is limited by decoherence and dephasing of the optical transition. Even with high quality material at low temperature, the optical Linewidths are a factor of two larger than the transform-limit. A major contributor to the inhomogeneous linewdith is the nuclear spin noise. We show here that the nuclear spin noise depends on optical excitation, increasing (decreasing) with increasing resonant laser power for the neutral (charged) exciton. Based on this observation, we discover regimes where we demonstrate transform-limited Linewidths on both neutral and charged excitons even when the measurement is performed very slowly.
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Linewidth of single photons from a single quantum dot: key role of nuclear spins
Nature Communications, 2013Co-Authors: Andreas V. Kuhlmann, Jonathan H. Prechtel, J. Houel, Arne Ludwig, Dirk Reuter, Andreas D. Wieck, Richard J. WarburtonAbstract:A semiconductor quantum dot mimics a two-level atom. Performance as a single photon source is limited by decoherence and dephasing of the optical transition. Even with high quality material at low temperature, the optical Linewidths are a factor of two larger than the transform limit. It is shown here that the inhomogeneous contribution to the Linewidth is caused by nuclear spin noise. This conclusion applies to both neutral and charged excitons. For the neutral exciton, we demonstrate an increase in the spin noise with increasing resonant laser power. Conversely for the charged exciton, we demonstrate a significant decrease in the spin noise with resonant laser power even without an external magnetic field. This noise reduction is exploited to demonstrate transform-limited optical Linewidths even when the measurement is performed very slowly.
F. Marin - One of the best experts on this subject based on the ideXlab platform.
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bragg section effects on Linewidth and lineshape in 1 55 spl mu m dbr tunable laser diodes
IEEE Photonics Technology Letters, 2004Co-Authors: P. Signoret, J.-p. Tourrenc, B. Orsal, M.-h. Monier, P. Leboudec, Joel Jacquet, Mikhael Myara, F. MarinAbstract:We report Linewidth and lineshape measurements on 1.55-/spl mu/m distributed Bragg reflector tunable laser diodes using the heterodyne method. We measure Lorentzian Linewidths ranging from 3.5 to 25 MHz without any passive section injection. Biasing the Bragg section enhances the residual Linewidth up to 6.2 MHz, changes the Linewidth-power product, and brings an additional Gaussian lineshape. The feedback sensitivity of the overall setup is also demonstrated.
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Bragg section effects on Linewidth and lineshape in 1.55-μm DBR tunable laser diodes
IEEE Photonics Technology Letters, 2004Co-Authors: P. Signoret, J.-p. Tourrenc, B. Orsal, M.-h. Monier, P. Leboudec, Joel Jacquet, Mikhael Myara, F. MarinAbstract:We report Linewidth and lineshape measurements on 1.55-μm distributed Bragg reflector tunable laser diodes using the heterodyne method. We measure Lorentzian Linewidths ranging from 3.5 to 25 MHz without any passive section injection. Biasing the Bragg section enhances the residual Linewidth up to 6.2 MHz, changes the Linewidth-power product, and brings an additional Gaussian lineshape. The feedback sensitivity of the overall setup is also demonstrated.
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3.6-MHz Linewidth 1.55-μm monomode vertical-cavity surface-emitting laser
IEEE Photonics Technology Letters, 2001Co-Authors: P. Signoret, J.-p. Tourrenc, B. Orsal, Mikhael Myara, F. Marin, S. Viciani, G. Belleville, A. Plais, F. Gaborit, Joel JacquetAbstract:We report on high-resolution Linewidth measurement of proton-implanted bottom-emitting InGaAsP long-wavelength vertical-cavity surface-emitting lasers (VCSELs) employing the heterodyne method. Devices with 35-μm active diameter exhibit record Linewidths of 3.6 MHz and negligible extrapolated Linewidth for infinite power, at room temperature. This result relies on the long-cavity-designed VCSEL. The Linewidth enhancement factor is also determined: /spl alpha//spl ap/2.1.
Sebastien Chénais - One of the best experts on this subject based on the ideXlab platform.
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An ultra-narrow Linewidth solution-processed organic laser
Light: Science & Applications, 2016Co-Authors: Oussama Mhibik, Sebastien Forget, George Venus, Ivan Divliansky, Leonid Glebov, Sebastien ChénaisAbstract:Optically pumped lasers based on solution-processed thin-film gain media have recently emerged as low-cost, broadly tunable, and versatile active photonics components that can fit any substrate and are useful for, e.g., chemo- or biosensing or visible spectroscopy. Although single-mode operation has been demonstrated in various resonator architectures with a large variety of gain media—including dye-doped polymers, organic semiconductors, and, more recently, hybrid perovskites—the reported Linewidths are typically on the order of a fraction of a nanometer or broader, i.e., the coherence lengths are no longer than a few millimeters, which does not enable high-resolution spectroscopy or coherent sensing. The Linewidth is fundamentally constrained by the short photon cavity lifetime in the standard resonator geometries. We demonstrate here a novel structure for an organic thin-film solid-state laser that is based on a vertical external cavity, wherein a holographic volume Bragg grating ensures both spectral selection and output coupling in an otherwise very compact (∼cm^3) design. Under short-pulse (0.4 ns) pumping, Fourier-transform-limited laser pulses are obtained, with a full width at half-maximum Linewidth of 900 MHz (1.25 pm). Using 20-ns-long pump pulses, the Linewidth can be further reduced to 200 MHz (0.26 pm), which is four times above the Fourier limit and corresponds to an unprecedented coherence length of 1 m. The concept is potentially transferrable to any type of thin-film laser and can be ultimately made tunable; it also represents a very compact alternative to bulky grating systems in dye lasers. A small organic laser with an ultranarrow Linewidth in the sub-gigahertz regime could aid high-resolution spectroscopy and coherent sensing. The device’s narrow emission is due to the use of an external cavity design that features a volume Bragg grating as an output coupler reflector. Oussama Mhibik and co-workers from France and the USA say that their vertical external-cavity surface-emitting organic laser offers Linewidths as narrow as 200 MHz (0.26 pm). This Linewidth is two to three orders of magnitude smaller than those of other designs of organic lasers and corresponds to a coherence length of 1 m. The laser’s gain medium is a thin film of PMMA polymer doped with the dye rhodamine 640 and it is pumped with pulses from a frequency-doubled Nd:YAG laser.
P. Signoret - One of the best experts on this subject based on the ideXlab platform.
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bragg section effects on Linewidth and lineshape in 1 55 spl mu m dbr tunable laser diodes
IEEE Photonics Technology Letters, 2004Co-Authors: P. Signoret, J.-p. Tourrenc, B. Orsal, M.-h. Monier, P. Leboudec, Joel Jacquet, Mikhael Myara, F. MarinAbstract:We report Linewidth and lineshape measurements on 1.55-/spl mu/m distributed Bragg reflector tunable laser diodes using the heterodyne method. We measure Lorentzian Linewidths ranging from 3.5 to 25 MHz without any passive section injection. Biasing the Bragg section enhances the residual Linewidth up to 6.2 MHz, changes the Linewidth-power product, and brings an additional Gaussian lineshape. The feedback sensitivity of the overall setup is also demonstrated.
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Bragg section effects on Linewidth and lineshape in 1.55-μm DBR tunable laser diodes
IEEE Photonics Technology Letters, 2004Co-Authors: P. Signoret, J.-p. Tourrenc, B. Orsal, M.-h. Monier, P. Leboudec, Joel Jacquet, Mikhael Myara, F. MarinAbstract:We report Linewidth and lineshape measurements on 1.55-μm distributed Bragg reflector tunable laser diodes using the heterodyne method. We measure Lorentzian Linewidths ranging from 3.5 to 25 MHz without any passive section injection. Biasing the Bragg section enhances the residual Linewidth up to 6.2 MHz, changes the Linewidth-power product, and brings an additional Gaussian lineshape. The feedback sensitivity of the overall setup is also demonstrated.
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3.6-MHz Linewidth 1.55-μm monomode vertical-cavity surface-emitting laser
IEEE Photonics Technology Letters, 2001Co-Authors: P. Signoret, J.-p. Tourrenc, B. Orsal, Mikhael Myara, F. Marin, S. Viciani, G. Belleville, A. Plais, F. Gaborit, Joel JacquetAbstract:We report on high-resolution Linewidth measurement of proton-implanted bottom-emitting InGaAsP long-wavelength vertical-cavity surface-emitting lasers (VCSELs) employing the heterodyne method. Devices with 35-μm active diameter exhibit record Linewidths of 3.6 MHz and negligible extrapolated Linewidth for infinite power, at room temperature. This result relies on the long-cavity-designed VCSEL. The Linewidth enhancement factor is also determined: /spl alpha//spl ap/2.1.
Joel Jacquet - One of the best experts on this subject based on the ideXlab platform.
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bragg section effects on Linewidth and lineshape in 1 55 spl mu m dbr tunable laser diodes
IEEE Photonics Technology Letters, 2004Co-Authors: P. Signoret, J.-p. Tourrenc, B. Orsal, M.-h. Monier, P. Leboudec, Joel Jacquet, Mikhael Myara, F. MarinAbstract:We report Linewidth and lineshape measurements on 1.55-/spl mu/m distributed Bragg reflector tunable laser diodes using the heterodyne method. We measure Lorentzian Linewidths ranging from 3.5 to 25 MHz without any passive section injection. Biasing the Bragg section enhances the residual Linewidth up to 6.2 MHz, changes the Linewidth-power product, and brings an additional Gaussian lineshape. The feedback sensitivity of the overall setup is also demonstrated.
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Bragg section effects on Linewidth and lineshape in 1.55-μm DBR tunable laser diodes
IEEE Photonics Technology Letters, 2004Co-Authors: P. Signoret, J.-p. Tourrenc, B. Orsal, M.-h. Monier, P. Leboudec, Joel Jacquet, Mikhael Myara, F. MarinAbstract:We report Linewidth and lineshape measurements on 1.55-μm distributed Bragg reflector tunable laser diodes using the heterodyne method. We measure Lorentzian Linewidths ranging from 3.5 to 25 MHz without any passive section injection. Biasing the Bragg section enhances the residual Linewidth up to 6.2 MHz, changes the Linewidth-power product, and brings an additional Gaussian lineshape. The feedback sensitivity of the overall setup is also demonstrated.
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3.6-MHz Linewidth 1.55-μm monomode vertical-cavity surface-emitting laser
IEEE Photonics Technology Letters, 2001Co-Authors: P. Signoret, J.-p. Tourrenc, B. Orsal, Mikhael Myara, F. Marin, S. Viciani, G. Belleville, A. Plais, F. Gaborit, Joel JacquetAbstract:We report on high-resolution Linewidth measurement of proton-implanted bottom-emitting InGaAsP long-wavelength vertical-cavity surface-emitting lasers (VCSELs) employing the heterodyne method. Devices with 35-μm active diameter exhibit record Linewidths of 3.6 MHz and negligible extrapolated Linewidth for infinite power, at room temperature. This result relies on the long-cavity-designed VCSEL. The Linewidth enhancement factor is also determined: /spl alpha//spl ap/2.1.