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Chen C, Heyes JE, Hong KH, Niu MY, Lita AE, Gerrits T, Nam SW, Shapiro JH, Wong FNC. Indistinguishable single-mode photons from spectrally engineered biphotons. OPTICS EXPRESS 2019; 27:11626-11634. [PMID: 31053005 DOI: 10.1364/oe.27.011626] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Accepted: 04/08/2019] [Indexed: 06/09/2023]
Abstract
We use pulsed spontaneous parametric down-conversion in KTiOPO 4, with a Gaussian phase-matching function and a transform-limited Gaussian pump, to achieve near-unity spectral purity in heralded single photons at telecommunication wavelength. Theory shows that these phase-matching and pump conditions are sufficient to ensure that a biphoton state with a circularly symmetric joint spectral intensity profile is transform limited and factorable. We verify the heralded-state spectral purity in a four-fold coincidence measurement by performing Hong-Ou-Mandel interference between two independently generated heralded photons. With a mild spectral filter we obtain an interference visibility of 98.4±1.1% which corresponds to a heralded-state purity of 99.2%. Our heralded photon source is potentially an essential resource for measurement-based quantum information processing and quantum network applications.
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Meisenheimer SK, Fürst JU, Schiller A, Holderied F, Buse K, Breunig I. Pseudo-type-II tuning behavior and mode identification in whispering gallery optical parametric oscillators. OPTICS EXPRESS 2016; 24:15137-15142. [PMID: 27410665 DOI: 10.1364/oe.24.015137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Wavelength tuning of conventional mirror-based optical parametric oscillators (OPOs) exhibits parabolically-shaped tuning curves (type-0 and type-I phase matching) or tuning branches that cross each other with a finite slope (type-II phase matching). We predict and experimentally prove that whispering gallery OPOs based on type-0 phase matching show both tuning behaviors, depending on whether the mode numbers of the generated waves coincide or differ. We investigate the wavelength tuning of optical parametric oscillation in a millimeter-sized radially-poled lithium niobate disk pumped at 1 μm wavelength generating signal and idler waves between 1.7 and 2.6 μm wavelength. Our experimental findings excellently coincide with the theoretical predictions. The investigated whispering gallery optical parametric oscillator combines the employment of the highest nonlinear-optical coefficient of the material with a controlled type-II-like wavelength tuning and with the possibility of self-phase locking.
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Bae IH, Moon HS, Kim SK, Park SN, Lee DH. Optical injection locking of a singly resonant continuous-wave optical parametric oscillator. OPTICS LETTERS 2013; 38:597-599. [PMID: 23455148 DOI: 10.1364/ol.38.000597] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We report on experimental realization of optical injection locking of a singly resonant continuous-wave optical parametric oscillator (OPO) based on a thermally induced waveguide in a magnesium-oxide doped periodically poled lithium niobate. An external cavity diode laser is used to control the frequency of the resonant signal output of the OPO at 795 nm. The key to successful injection locking was the improvement of the OPO spatial modes by a special operating condition with a thermally induced waveguide. The phase coherence of injection locking is confirmed by recording a high-contrast interference fringe between the injection laser and the OPO output. High-resolution measurement of the frequency spectrum of the nonresonant idler output by the delayed self-heterodyne technique shows that the spectral linewidth of the OPO is reduced from 4.5 to 0.4 MHz by injection locking. The full locking range is assumed to be less than 1.7 MHz.
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Affiliation(s)
- In-Ho Bae
- Division of Physical Metrology, Korea Research Institute of Standards and Science (KRISS), Daejeon 305-340, South Korea
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Pysher M, Miwa Y, Shahrokhshahi R, Xie D, Pfister O. A new method for locking the signal-field phase difference in a type-II optical parametric oscillator above threshold. OPTICS EXPRESS 2010; 18:27858-27871. [PMID: 21197059 DOI: 10.1364/oe.18.027858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We propose and demonstrate a new method for phaselocking the signal fields emitted above threshold by a nondegenerate, type-II optical parametric oscillator (OPO). This method is based on the observation that amplitude modulation of the pump beam produces a related modulation of the frequency difference of the OPO signals via the temperature-tuning of the index of refraction in the nonlinear crystal. We successfully use pump modulation as a correction for phase-difference locking of the OPO signals and observe a 1 kHz beat note stable over more than 10 s, both figures solely limited by the measurement time. This method eliminates the need for applying electronic phase-correction signals directly to the nonlinear crystal which caused crystal damage in a previous phaselocking technique.
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Affiliation(s)
- Matthew Pysher
- Department of Physics, University of Virginia, Charlottesville, Virginia 22904-4714, USA
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Keller G, D'Auria V, Treps N, Coudreau T, Laurat J, Fabre C. Experimental demonstration of frequency-degenerate bright EPR beams with a self-phase-locked OPO. OPTICS EXPRESS 2008; 16:9351-9356. [PMID: 18575498 DOI: 10.1364/oe.16.009351] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
We report the first experimental observation of bright EPR beams produced by a type-II optical parametric oscillator operating above threshold at frequency degeneracy. The degenerate operation is obtained by introducing a birefringent plate inside the cavity resulting in phase locking. After filtering the pump noise, which plays a critical role, continuous-variable EPR correlations between the orthogonally polarized signal and idler beams are demonstrated.
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Affiliation(s)
- G Keller
- Laboratoire Kastler Brossel, Université Pierre et Marie Curie, Ecole Normale Supérieure, CNRS, Case 74, 4 place Jussieu, 75252 Paris Cedex 05, France
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Ferrari G. Generating green to red light with semiconductor lasers. OPTICS EXPRESS 2007; 15:1672-1678. [PMID: 19532402 DOI: 10.1364/oe.15.001672] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Diode lasers enable one to continuously cover the 730 to 1100 nm range as well as the 370 to 550 nm range by frequency doubling, but a large part of the electro-magnetic spectrum spanning from green to red remains accessible only through expensive and unpractical optically pumped dye lasers. Here we devise a method to multiply the frequency of optical waves by a factor 3/2 with a conversion that is phase-coherent and highly efficient. Together with harmonic generation, it will enable one to cover the visible spectrum with semiconductor lasers, opening new avenues in important fields such as laser spectroscopy and optical metrology.
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Inaba H, Ikegami T, Hong FL, Bitou Y, Onae A, Schibli TR, Minoshima K, Matsumoto H. Doppler-free spectroscopy using a continuous-wave optical frequency synthesizer. APPLIED OPTICS 2006; 45:4910-5. [PMID: 16807599 DOI: 10.1364/ao.45.004910] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
A continuous-wave (cw) optical frequency synthesizer is demonstrated by using a monolithic-type cw optical parametric oscillator (cw-OPO) and an optical frequency comb. The cw-OPO is phase locked to an optical frequency comb that is phase locked to an atomic clock. The output frequency of the cw-OPO is frequency shifted with an electro-optic modulator, which makes it possible to tune the frequency continuously over 10 GHz. Furthermore, Doppler-free spectroscopy is performed using the optical frequency synthesizer for a cesium D1 line at 895 nm. The observed linewidth of 5 MHz is the natural linewidth of cesium. The center frequency of the line is consistent with a previous report.
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Affiliation(s)
- Hajime Inaba
- National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Japan.
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Laurat J, Keller G, Oliveira-Huguenin JA, Fabre C, Coudreau T, Serafini A, Adesso G, Illuminati F. Entanglement of two-mode Gaussian states: characterization and experimental production and manipulation. ACTA ACUST UNITED AC 2005. [DOI: 10.1088/1464-4266/7/12/021] [Citation(s) in RCA: 131] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Kalmani G, Arie A, Blau P, Pearl S, Smith AV. Polarization-mixing optical parametric oscillator. OPTICS LETTERS 2005; 30:2146-8. [PMID: 16127938 DOI: 10.1364/ol.30.002146] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
We report the experimental realization of a new type of optical parametric oscillator in which oscillation is achieved by polarization rotation in a linear retarder, followed by nonlinear polarization mixing. The mixing is performed by a type II degenerate parametric downconversion in a periodically poled KTP crystal pumped by a 1064 nm pulsed Nd:YAG pump. A single, linearly polarized beam, precisely at the degenerate wavelength is generated. The output spectrum has a narrow linewidth (below the instrumentation bandwidth of 1 nm) and is highly stable with respect to variations in the crystal temperature.
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Affiliation(s)
- Gal Kalmani
- Department of Physical Electronics, Tel-Aviv University, Tel-Aviv 69978, Israel
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Laurat J, Longchambon L, Fabre C, Coudreau T. Experimental investigation of amplitude and phase quantum correlations in a type II optical parametric oscillator above threshold: from nondegenerate to degenerate operation. OPTICS LETTERS 2005; 30:1177-9. [PMID: 15943301 DOI: 10.1364/ol.30.001177] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
We describe a stable type II optical parametric oscillator operated above threshold that provides 9.7 +/- 0.5 dB (89%) of quantum noise reduction on the intensity difference of the signal and idler modes. We also report the first experimental study, to our knowledge, by homodyne detection of the generated bright two-mode state in the case of frequency-degenerate operation obtained by the introduction of a birefringent plate inside an optical cavity.
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Affiliation(s)
- Julien Laurat
- Laboratoire Kastler Brossel, Case 74, Université Pierre et Marie Curie, 4 Place Jussieu, 75252 Paris Cedex 05, France
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Zondy JJ, Kolker D, Wong FNC. Dynamical signatures of self-phase-locking in a triply resonant optical parametric oscillator. PHYSICAL REVIEW LETTERS 2004; 93:043902. [PMID: 15323763 DOI: 10.1103/physrevlett.93.043902] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2004] [Indexed: 05/24/2023]
Abstract
We report on specific signatures of self-phase-locking in a cw frequency divide-by-three optical parametric oscillator subject to two competing chi(2) nonlinear processes that couple the signal and idler subharmonic waves. The self-phase-locked pair appears as a broad fringe dip within the mode-pair cluster. We have also observed Hopf instabilities of the zero-detuning case at approximately 4 x the pump threshold. These results open the path to experimental investigation of quantum entanglement and phase-locked transverse mode structures in this novel class of parametric oscillators.
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Affiliation(s)
- Jean-Jacques Zondy
- BNM-SYRTE, Observatoire de Paris, 61 Avenue de l'Observatoire, F-75014 Paris, France.
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Hayasaka K, Zhang Y, Kasai K. Generation of twin beams from an optical parametric oscillator pumped by a frequency-doubled diode laser. OPTICS LETTERS 2004; 29:1665-1667. [PMID: 15309853 DOI: 10.1364/ol.29.001665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Quantum-correlated twin beams were generated from a triply resonant optical parametric oscillator with an a-cut KTP crystal pumped by a frequency-doubled diode laser. A total output of 5.1 mW was obtained in the classical-nonclassical light-conversion system driven by a 50-mW diode laser at 1080 nm. A quantum-noise reduction of 4.3 dB (63%) in the intensity difference between the twin beams was successfully observed at the detection frequency of 3 MHz.
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Affiliation(s)
- Kazuhiro Hayasaka
- Kansai Advanced Research Center, National Institute of Information and Communications Technology, Iwaoka, Iwaka-cho, Nishi-ku, Kobe, Japan.
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Feng S, Pfister O. Quantum interference of ultrastable twin optical beams. PHYSICAL REVIEW LETTERS 2004; 92:203601. [PMID: 15169352 DOI: 10.1103/physrevlett.92.203601] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2003] [Indexed: 05/24/2023]
Abstract
We report the first measurement of the quantum phase-difference noise of an ultrastable nondegenerate optical parametric oscillator that emits twin beams classically phase locked at exact frequency degeneracy. The measurement illustrates the property of a lossless balanced beam splitter to convert number-difference squeezing into phase-difference squeezing, and thus provides indirect evidence for Heisenberg-limited interferometry using twin beams. This experiment is a generalization of the Hong-Ou-Mandel interference effect for continuous variables and constitutes a milestone towards continuous-variable entanglement of bright, ultrastable nondegenerate beams.
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Affiliation(s)
- Sheng Feng
- Department of Physics, University of Virginia, 382 McCormick Road, Charlottesville, Virginia 22904-4714, USA
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Izús G, San Miguel M, Walgraef D. Polarization coupling and pattern selection in a type-II optical parametric oscillator. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2002; 66:036228. [PMID: 12366245 DOI: 10.1103/physreve.66.036228] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2001] [Indexed: 05/23/2023]
Abstract
We study the role of a direct intracavity polarization coupling in the dynamics of transverse pattern formation in type-II optical parametric oscillators. Transverse intensity patterns are predicted from a stability analysis, numerically observed, and described in terms of amplitude equations. Standing wave intensity patterns for the two polarization components of the field arise from the nonlinear competition between two concentric rings of unstable modes in the far field. Close to threshold a wavelength is selected leading to standing waves with the same wavelength for the two polarization components. Far from threshold the competition stabilizes patterns in which two different wavelengths coexist.
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Affiliation(s)
- Gonzalo Izús
- Instituto Mediterráneo de Estudios Avanzados, IMEDEA (CSIC-UIB), Universitat de les Illes Balears, E-07071 Palma de Mallorca, Spain.
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Izús G, San Miguel M, Santagiustina M. Phase-locked spatial domains and Bloch domain walls in type-II optical parametric oscillators. PHYSICAL REVIEW E 2001; 64:056231. [PMID: 11736078 DOI: 10.1103/physreve.64.056231] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2001] [Indexed: 11/07/2022]
Abstract
We study the role of transverse spatial degrees of freedom in the dynamics of signal-idler phase locked states in type-II optical parametric oscillators. Phase locking stems from signal-idler polarization coupling which arises if the cavity birefringence and/or dichroism is not matched to the nonlinear crystal birefringence. Spontaneous Bloch domain wall formation is observed numerically and the dynamics and chiral properties of the fronts are investigated. Bloch walls connect homogeneous regions of self-phase-locked solutions by means of a polarization transformation. The parameter range for phase locking is found analytically. The polarization properties and the dynamics of walls in one and two transverse spatial dimensions are explained. The transition from Bloch to Ising walls is characterized, the control parameter being the linear coupling strength. The wall dynamics governs spatiotemporal dynamical states of the system, which include transient curvature driven domain growth, persistent dynamics dominated by spiraling defects for Bloch walls, and labyrinthine pattern formation for Ising walls.
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Affiliation(s)
- G Izús
- Instituto Mediterráneo de Estudios Avanzados, IMEDEA (CSIC-UIB), E-07071 Palma de Mallorca, Spain.
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