31%-efficient blue second-harmonic generation in a periodically poled MgO:LiNbO_3 waveguide by frequency doubling of an AlGaAs laser diode

Sugita, Tomoya; Mizuuchi, Kiminori; Kimura, Yasuo; Yamamoto, Kazuhisa

doi:10.1364/ol.24.001590

Cited by 65 publications

(23 citation statements)

References 11 publications

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“…A CW laser beam (854 nm, 10 mW) from a distributed Bragg reflector (DBR) laser diode (SDL-5702-H1) is converted to violet light (427 nm) by type-I quasi-phase-matching secondharmonic-generation (SHG). Due to the high conversion efficiency over 1 %, we can obtain more than 0.1 mW of violet light [16]. After passing through a pellin broca prism and a blue filter (BF), the violet light is sent to the second device and conjugated photon pairs around 854 nm wavelength are generated in the process of spontaneous parametric down-conversion (PDC).…”

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confidence: 99%

New High-Efficiency Source of Photon Pairs for Engineering Quantum Entanglement

2001

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We have constructed an efficient source of photon pairs using a waveguide-type nonlinear device and performed a twophoton interference experiment with an unbalanced Michelson interferometer. Parametric down-converted photons from the nonlinear device are detected by two detectors located at the output ports of the interferometer. Because the interferometer is constructed with two optical paths of different length, photons from the shorter path arrive at the detector earlier than those from the longer path. We find that the difference of arrival time and the time window of the coincidence counter are important parameters which determine the boundary between the classical and quantum regime. When the time window of the coincidence counter is smaller than the arrival time difference, fringes of high visibility (80± 10%) were observed. This result is only explained by quantum theory and is clear evidence for quantum entanglement of the interferometer's optical paths.Two-photon entanglement has attracted considerable interest for studying the nonlocal correlations of quantum theory [1][2][3][4], and many experiments have been performed [5][6][7][8][9]. The contradiction of local realism can be realized more clearly with multi-photon entanglement systems [10], which have been demonstrated experimentally in recent years [11]. We can expect these systems to be used for novel applications such as quantum cryptography [12], and quantum teleportation [13].Multi-photon entanglement systems can be generated by parametric down-conversion. Since the probability of generating multi-photon entangled systems decreases exponentially with the number of entangled photons, it becomes more difficult to conduct experiments with a large number of entangled photons [14]. One of the candidates for solving this difficulty is to make the ultrabright source of polarization-entangled photons proposed by Kwiat et al. [15]. The source is superior to other sources because nearly every pair of photons is polarization entangled. Since the total number of generated photon pairs is limited by the nonlinear susceptibility and phase matching condition of a nonlinear crystal, a remarkable increase in the number of photon pairs can not be expected if one uses bulk crystals. This is to be compared to the drastic improvement of the efficiency to generate photon pairs we present. Our method uses a waveguide type nonlinear device originally developed for type-I quasi-phase-matching frequency doubling. Using the newly developed source of photon pairs, we then perform a two-photon interference experiment and show that photon pairs are in the entangled state for interferometer's optical paths. Parametric down-converted photons from the nonlinear device are detected by two detectors located at the output ports of the interferometer. Because this interferometer is constructed with two optical paths of different length, photons from the shorter path arrive at the detector earlier than those from the longer path. When the time window of the coincidence counter is ...

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confidence: 99%

New High-Efficiency Source of Photon Pairs for Engineering Quantum Entanglement

2001

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“…Poling of x-cut wafers is only possible with surface electrodes. Hence, resulting poled domains extend only a few microns below the surface [2]. Here, we report ultrashort pulse laser inscription of QPM elements with cross-sections of 500 times 90 µm 2 .…”

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confidence: 85%

Femtosecond pulse written quasi phase matching element in x-cut lithium niobate

Thomas

Hilbert

Geiß

et al. 2011

2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC)

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“…5 The damage resistance of this waveguide was demonstrated by blue second-harmonic generation ͑SHG͒ as high as 17 mW. 6 However, there is no quantifiable study on the photorefractive effect available for a periodically poled APE waveguide using MgO-or ZnO-doped LiNbO 3 . We report on our evaluation of the photorefractive effect in periodically poled APE waveguides using either MgO-or ZnO-doped LiNbO 3 .…”

Section: Reducing Photorefractive Effect In Periodically Poled Zno-anmentioning

confidence: 99%

Reducing photorefractive effect in periodically poled ZnO- and MgO-doped LiNbO3 wavelength converters

Asobe¹,

Tadanaga²,

Yanagawa³

et al. 2001

Applied Physics Letters

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The photorefractive effect in annealed proton-exchanged waveguides in periodically poled nondoped, MgO- and ZnO-doped LiNbO3 was evaluated by monitoring the quasiphase matching (QPM) wavelength shift induced by a 0.784-μm-irradiating light. The QPM wavelength shift was reduced at room temperature by a factor of 3–6 in ZnO- and MgO-doped samples compared with the nondoped samples within a 104–105-W/cm2-irradiation intensity range. The doped samples exhibited no significant wavelength shifts when the temperature was raised to slightly above room temperature (50–60 °C).

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31%-efficient blue second-harmonic generation in a periodically poled MgO:LiNbO_3 waveguide by frequency doubling of an AlGaAs laser diode

Cited by 65 publications

References 11 publications

New High-Efficiency Source of Photon Pairs for Engineering Quantum Entanglement

New High-Efficiency Source of Photon Pairs for Engineering Quantum Entanglement

Femtosecond pulse written quasi phase matching element in x-cut lithium niobate

Reducing photorefractive effect in periodically poled ZnO- and MgO-doped LiNbO3 wavelength converters

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