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ABSTRACT: Submicron axial resolution in optical coherence tomography is demonstrated using one output beam from a broadband noncollinear parametric down-conversion source. The large spectral bandwidth is achieved by tightly focusing the narrowband pump laser.
Quantum Electronics and Laser Science Conference, 2005. QELS '05; 06/2005
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ABSTRACT: We report the first experimental observation of self-focusing in walk-off compensating optical tandems. The observation should open the door to the exploration of soliton formation in new classes of materials and settings.
Lasers and Electro-Optics Society, 2003. LEOS 2003. The 16th Annual Meeting of the IEEE; 11/2003
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ABSTRACT: Generation of maximally entangled states with different phase distributions and quantum states that can violate Bell's inequality stronger than a maximally entangled state are reported. The scheme can be used to enhance the efficiency of the quantum solution of a two- party communication complexity problem over any classical protocol by using two qutrit that violates Bell's inequality. Spatial amplitude profile of the pump beam that generates a maximally entangled qu-quart is given.
Quantum Electronics Conference, 2003. EQEC '03. European; 07/2003
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ABSTRACT: Summary form only given. We study the entangled photon orbital angular momentum states generated in spontaneous parametric downconversion and predict that highly noncollinear geometries lead to apparent orbital angular momentum violations.
Quantum Electronics Conference, 2003. EQEC '03. European; 07/2003
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ABSTRACT: We report the experimental observation of the formation of multiple optical quadratic solitons in a process mediated by the amplification of minute asymmetries in the diffraction properties of the input light.
Quantum Electronics and Laser Science, 2003. QELS. Postconference Digest; 07/2003
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ABSTRACT: We put forward the concept of quantum spiral bandwidth of the spatial mode function of the two-photon entangled state in spontaneous parametric downconversion. We obtain the bandwidth using the eigenstates of the orbital angular momentum of the biphoton states, and reveal its dependence with the length of the down converting crystal and waist of the pump beam. The connection between the quantum spiral bandwidth and the entropy of entanglement of the quantum state is discussed. Comment: 10 pages, 3 figures
06/2003;
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ABSTRACT: Whole families of stable optical solitons are known to exist in
media with quadratic nonlinearity, and evidence of such existence has
been demonstrated experimentally during the last years in several
materials. However, soliton existence does not always guarantee soliton
excitation. On the contrary, suitable conditions must be employed in
each particular setting for solitons to be efficiently, or even
actually, generated. We overview the recent developments along this
line, and illustrate their paramount practical importance by discussing
in detail the differences encountered with identical soliton families
when they are to be excited in up-conversion or down-conversion
processes. Limitations of both, the ideal theoretical predictions and
the accessible experimental data are highlighted
IEEE Journal of Selected Topics in Quantum Electronics 06/2002; · 3.78 Impact Factor
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ABSTRACT: We introduce spatiotemporal spinning solitons (vortex tori) of the three-dimensional nonlinear Schrödinger equation with focusing cubic and defocusing quintic nonlinearities. The first ever found completely stable spatiotemporal vortex solitons are demonstrated. A general conclusion is that stable spinning solitons are possible as a result of competition between focusing and defocusing nonlinearities.
Physical Review Letters 03/2002; 88(7):073902. · 7.37 Impact Factor
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ABSTRACT: We experimentally demonstrate the possibility of breaking up intense vortex light beams into stable and controllable sets of parametric solitons. We report observations performed in seeded second-harmonic generation, but the scheme can be extended to all parametric processes. The number of generated solitons is shown to be determined by a robust arithmetic rule.
Optics Letters 08/2001; 26(13):1004-6. · 3.40 Impact Factor
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ABSTRACT: Summary form only given. N-(4-nitrophenyl)-L-prolinol (NPP) is an organic molecular crystal developped by molecular engineering, that exhibits one of the highest phase-matchable second-order susceptibilities reported so far in the near-infrared spectral range (d<sub>eff</sub>≈56 pm/V). However, the large spatial and temporal walk-off existing in NPP can limit severely the usefulness of the material away from the noncritical phase-matching (ncpm) wavelength and for shorter pulses. Here we show that subpicosecond pulses can be efficiently frequency-doubled and mixed in NPP with moderate pump intensities, by employing tilted pulse techniques. These techniques make use of the large Poynting vector walk-off exhibited by NPP crystals outside the ncpm. Such techniques are based on the diffraction of the input pump wave by a grating so that each spectral component is dispersed in a different direction, thus the resulting signal is a tilted pulse.
Quantum Electronics and Laser Science Conference, 2001. QELS '01. Technical Digest. Summaries of Papers Presented at the; 02/2001
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ABSTRACT: We show how to exploit the high quadratic nonlinear coefficient of the organic crystal N-(4-nitrophenyl)-L-prolinol for generation and parametric mixing of ultrashort pulses by use of tilted-pulse techniques. The effective crystal length for subpicosecond operation is shown to be enhanced from tens of micrometers to tens of millimeters. Efficient frequency doubling of 100-fs pulses is predicted in walk-off-compensated geometries with peak intensities of a few megawatts per square centimeter.
Optics Letters 01/2001; 25(23):1735-7. · 3.40 Impact Factor
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ABSTRACT: We show that the efficiency and the mismatch bandwidth of quadratic soliton formation under conditions of second-harmonic generation can be enhanced in an important way in synthetic phase-matching profiles. Soliton excitation in smooth but arbitrary profiles is shown to be well described by a reduced variational approach. The potential of abrupt, nonadiabatic profiles for improved soliton formation is numerically revealed.
Optics Letters 10/2000; 25(17):1273-5. · 3.40 Impact Factor
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ABSTRACT: Propagation of soliton signals in quadratic nonlinear media under
conditions for second-harmonic generation in the presence of
multiple-frequency-band absorption and amplification is addressed. The
reshaping and energy redistribution of the multiple-frequency solitons
under the action of the single-band loss and gain is investigated and
shown in detail. New chirped localized solitary-wave solutions that
exactly compensate loss and gain are presented. Practical implementation
conditions are discussed
IEEE Journal of Quantum Electronics 10/1999; · 1.88 Impact Factor
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ABSTRACT: The authors show that investigations on the stability of nonlinear waves guided by planar structures greatly benefit when the conditions of marginal stability are considered on a suitable restricted parameter space. Relevant information is summarized in a few diagrams, so that waveguiding properties can be immediately read off from them, and critical power-independent values of the waveguide parameters to ensure stable TE0 propagation are obtained for a particular structure.
Pure and Applied Optics Journal of the European Optical Society Part A 12/1998; 2(3):235.
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Optics Letters 12/1998; 23(22):1787. · 3.40 Impact Factor
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ABSTRACT: We report what is believed to be the first experimental demonstration of the azimuthal self-breaking of intense beams containing a vortex phase dislocation into sets of optical spatial solitons in a quadratic nonlinear material. The observations were performed in a KTP crystal.
Optics Letters 10/1998; 23(18):1444-6. · 3.40 Impact Factor
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ABSTRACT: We describe the principle of operation of a new class of optical devices operating in quadratic non-linear media that mix wave front topological charge dislocations nested in focused light beams and produce certain patterns of bright spatial solitons. Central to the device behaviour is the orbital angular momentum of the light beams.
Optical and Quantum Electronics 01/1998; 30(7):809-827. · 0.82 Impact Factor
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ABSTRACT: The propagation of intense light beams in planar optical waveguides made of quadratic nonlinear media under conditions for
second-harmonic generation is investigated. It is shown numerically that under appropriate conditions, input light beams break
up into several spatial solitons that separate from each other and exit the waveguide at different positions. This paper reports
the results of a series of numerical experiments and analytical investigations that were performed to elucidate the dynamics
of the self-splitting process and discusses the implications of the results to the implementation of an eigenvalue switching
device.
Optical and Quantum Electronics 04/1997; 29(7):757-776. · 0.82 Impact Factor
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ABSTRACT: The existence conditions and waveguiding properties of new hybrid,
TE-dominant waveguide modes of properly tailored waveguides consisting
on ultrathin films cladded by a positive birefringent crystal are
analyzed. The results show that the existence conditions of such waves
strongly depend on the waveguide parameters. Accordingly, the related
guided-to-radiated wave transition holds promise for switching
applications requiring a strong sensitive dependence on the material
refractive index values
Journal of Lightwave Technology 11/1995; · 2.78 Impact Factor
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ABSTRACT: Hybrid surface plasmon polaritons propagating in a new configuration comprising an ultrathin metal film bounded by a positive birefringent crystal on one side and a glass material on the other side are investigated. The results show that the conditions for existence of such hybrid surface plasmon polaritons have a strong dependence on the structure parameters. This feature opens the way for a new type of optical sensor with directional sensitivity.
Optical and Quantum Electronics 07/1994; 26(8):857-863. · 0.82 Impact Factor
