The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
Hiroaki Minamide - One of the best experts on this subject based on the ideXlab platform.
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Tunable Backward Terahertz-wave Parametric Oscillation.
Scientific reports, 2019Co-Authors: Kouji Nawata, Yu Tokizane, Yuma Takida, Hiroaki MinamideAbstract:Backward optical parametric oscillation has attracted attention for cavityless spectral narrowband generation based on perfect photon conversion. Few demonstrations have shown its potential from the aspect of nonlinear photonics; therefore, the mechanisms of momentum conservation among interacting light waves have been concealed by the restricted configuration under the Phase-Matching Condition of periodically poled structures. Here, we unveil a tunable mechanism in the terahertz region by active control of the Phase-Matching Condition. The tunability of backward terahertz-wave parametric oscillation is investigated using a quasi-collinear Phase-Matching model and its frequency range from the sub-terahertz to terahertz region is identified. Transform-limited terahertz-wave pulse is achieved simply by installing a device on the pump propagating line with no cavity. Moreover, the cascading terahertz-wave generation enhances the photon conversion efficiency, thus making nonlinear optics and its applications more promising. The results highlight new capabilities for using modern ferroelectric materials and encourage further research on nonlinear optics.
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Tunable Backward THz-Wave Parametric Oscillation Using a Periodically Poled Lithium Niobate
Conference on Lasers and Electro-Optics, 2018Co-Authors: Kouji Nawata, Yu Tokizane, Yuma Takida, Hiroaki MinamideAbstract:We demonstrated tunable backward terahertz-wave parametric oscillation using a slant-stripe-type periodically poled lithium niobate with a poling period of 53 μm. A novel noncollinear Phase-Matching scheme, quasi-collinear Phase-Matching Condition, produces the wide tunability.
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Backward THz-wave parametric oscillation with tunability
Laser Congress 2017 (ASSL LAC), 2017Co-Authors: Kouji Nawata, Yu Tokizane, Yuma Takida, Hiroaki MinamideAbstract:We presented the first demonstration of backward OPO in the THz region. We found that quasi-collinear Phase-Matching Condition by using a slant-stripe-type PPLN is capable of generating widely tunable THz radiation.
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Optimization of Broadly Tunable BNA-DFG Terahertz-Wave Source
Nonlinear Optics, 2011Co-Authors: Takashi Notake, Kouji Nawata, Yuye Wang, Hiroshi Kawamata, Hiroaki MinamideAbstract:Broadly tunable terahertz wave source utilizing difference frequency generation in a organic BNA crystal is developed. By using dual KTP-OPO optimized for Phase Matching Condition, wideband THz-wave generation from sub- to 20 THz is achieved.
Kouji Nawata - One of the best experts on this subject based on the ideXlab platform.
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Tunable Backward Terahertz-wave Parametric Oscillation.
Scientific reports, 2019Co-Authors: Kouji Nawata, Yu Tokizane, Yuma Takida, Hiroaki MinamideAbstract:Backward optical parametric oscillation has attracted attention for cavityless spectral narrowband generation based on perfect photon conversion. Few demonstrations have shown its potential from the aspect of nonlinear photonics; therefore, the mechanisms of momentum conservation among interacting light waves have been concealed by the restricted configuration under the Phase-Matching Condition of periodically poled structures. Here, we unveil a tunable mechanism in the terahertz region by active control of the Phase-Matching Condition. The tunability of backward terahertz-wave parametric oscillation is investigated using a quasi-collinear Phase-Matching model and its frequency range from the sub-terahertz to terahertz region is identified. Transform-limited terahertz-wave pulse is achieved simply by installing a device on the pump propagating line with no cavity. Moreover, the cascading terahertz-wave generation enhances the photon conversion efficiency, thus making nonlinear optics and its applications more promising. The results highlight new capabilities for using modern ferroelectric materials and encourage further research on nonlinear optics.
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Tunable Backward THz-Wave Parametric Oscillation Using a Periodically Poled Lithium Niobate
Conference on Lasers and Electro-Optics, 2018Co-Authors: Kouji Nawata, Yu Tokizane, Yuma Takida, Hiroaki MinamideAbstract:We demonstrated tunable backward terahertz-wave parametric oscillation using a slant-stripe-type periodically poled lithium niobate with a poling period of 53 μm. A novel noncollinear Phase-Matching scheme, quasi-collinear Phase-Matching Condition, produces the wide tunability.
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Backward THz-wave parametric oscillation with tunability
Laser Congress 2017 (ASSL LAC), 2017Co-Authors: Kouji Nawata, Yu Tokizane, Yuma Takida, Hiroaki MinamideAbstract:We presented the first demonstration of backward OPO in the THz region. We found that quasi-collinear Phase-Matching Condition by using a slant-stripe-type PPLN is capable of generating widely tunable THz radiation.
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Optimization of Broadly Tunable BNA-DFG Terahertz-Wave Source
Nonlinear Optics, 2011Co-Authors: Takashi Notake, Kouji Nawata, Yuye Wang, Hiroshi Kawamata, Hiroaki MinamideAbstract:Broadly tunable terahertz wave source utilizing difference frequency generation in a organic BNA crystal is developed. By using dual KTP-OPO optimized for Phase Matching Condition, wideband THz-wave generation from sub- to 20 THz is achieved.
Yutaka Oyama - One of the best experts on this subject based on the ideXlab platform.
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Phase-Matching Condition for THz wave generation via difference frequency generation using InxGa1-xSe mixed crystals.
Optics express, 2020Co-Authors: Yohei Sato, Mayu Nakajima, Chao Tang, Katsuya Watanabe, Tadao Tanabe, Yutaka OyamaAbstract:Terahertz (THz) waves at 9.7, 10.1 and 10.6 THz were generated via difference frequency generation in high-quality InxG1-xaSe mixed crystals with a relatively high indium compositions (x = 0.040, 0.048, 0.074) grown from an indium flux. The Phase-Matching angle for THz wave generation was measured for each indium content. As a result, it is confirmed that the incident angle of the excitation light satisfying the Phase-Matching Condition is shifted to a higher angle with an increase in the indium content.
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Widely tunable terahertz-wave generation from planar GaP waveguides via difference frequency generation under collinear Phase-Matching Condition
Japanese Journal of Applied Physics, 2014Co-Authors: Kyosuke Saito, Tadao Tanabe, Yutaka OyamaAbstract:We report on the widely tunable monochromatic terahertz (THz)-wave generation using a GaP planar waveguide under collinear Phase-matched difference frequency mixing, which is based on electrically synchronized optical parametric oscillators (OPOs). By adjusting the fundamental wavelength of OPOs in the range from 920 to 1500 nm, THz waves are generated in the range from 0.48 to 4.3 THz using a 290-?m-thick planar GaP waveguide. The collinear Phase-Matching Condition is satisfied in this range, which is consistent with the theoretical estimation. The wide tuning characteristics of THz waves obtained from the GaP planar waveguide structure are suitable for efficient and compact THz sources.
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Wide Frequency Tunable GaSe Terahertz Emitter under Collinear Phase Matching Condition
Key Engineering Materials, 2012Co-Authors: Hikari Dezaki, Tadao Tanabe, Hai Yan Jin, Yutaka OyamaAbstract:1.2μm – laser pumped wide frequency tunable coherent terahertz (THz) light source is demonstrated. The operation principle is based on difference frequency generation (DFG) with an excitation of phonon – polariton in Gallium Selenide (GaSe) crystal. The pump and signal lasers used are 1.2μm Cr:Forsterite lasers. The tuning range of the THz wave frequency covers from 0.3THz to 4.8THz (typeeooPhase Matching) and 8.3THz to 10.2THz (typeeooPhase Matching) under collinear Phase Matching Conditions. It is shown that the maximum conversion efficiency is up to ~10-6, which is 3 orders in magnitude larger than that of Gallium Phosphide (GaP) crystal.
Vincent Boyer - One of the best experts on this subject based on the ideXlab platform.
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Role of the Phase-Matching Condition in nondegenerate four-wave mixing in hot vapors for the generation of squeezed states of light
Physical Review A, 2013Co-Authors: Matthew T. Turnbull, Plamen G. Petrov, Christopher S. Embrey, Alberto M. Marino, Vincent BoyerAbstract:Non-degenerate forward four-wave mixing in hot atomic vapors has been shown to produce strong quantum correlations between twin beams of light [McCormick et al, Opt. Lett. 32, 178 (2007)], in a configuration which minimizes losses by absorption. In this paper, we look at the role of the Phase-Matching Condition in the trade-off that occurs between the efficiency of the nonlinear process and the absorption of the twin beams. To this effect, we develop a semi-classical model by deriving the atomic susceptibilities in the relevant double-lambda configuration and by solving the classical propagation of the twin-beam fields for parameters close to those found in typical experiments. These theoretical results are confirmed by a simple experimental study of the nonlinear gain experienced by the twin beams as a function of the Phase mismatch. The model shows that the amount of Phase mismatch is key to the realization of the physical Conditions in which the absorption of the twin beams is minimized while the cross-coupling between the twin beams is maintained at the level required for the generation of strong quantum correlations. The optimum is reached when the four-wave mixing process is not fully Phase matched.Comment: 10 pages, 9 figure
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role of the Phase Matching Condition in nondegenerate four wave mixing in hot vapors for the generation of squeezed states of light
Physical Review A, 2013Co-Authors: Matthew T. Turnbull, Christopher S. Embrey, Alberto M. Marino, P Petrov, Vincent BoyerAbstract:Nondegenerate forward four-wave mixing in hot atomic vapors has been shown to produce strong quantum correlations between twin beams of light [McCormick et al., Opt. Lett. 32, 178 (2007)], in a configuration which minimizes losses by absorption. In this paper, we look at the role of the Phase-Matching Condition in the trade-off that occurs between the efficiency of the nonlinear process and the absorption of the twin beams. To this effect, we develop a semiclassical model by deriving the atomic susceptibilities in the relevant double-$\ensuremath{\Lambda}$ configuration and by solving the classical propagation of the twin-beam fields for parameters close to those found in typical experiments. These theoretical results are confirmed by a simple experimental study of the nonlinear gain experienced by the twin beams as a function of the Phase mismatch. The model shows that the amount of Phase mismatch is key to the realization of the physical Conditions in which the absorption of the twin beams is minimized while the cross coupling between the twin beams is maintained at the level required for the generation of strong quantum correlations. The optimum is reached when the four-wave mixing process is not Phase matched for fully resonant four-wave mixing.
Yuma Takida - One of the best experts on this subject based on the ideXlab platform.
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Tunable Backward Terahertz-wave Parametric Oscillation.
Scientific reports, 2019Co-Authors: Kouji Nawata, Yu Tokizane, Yuma Takida, Hiroaki MinamideAbstract:Backward optical parametric oscillation has attracted attention for cavityless spectral narrowband generation based on perfect photon conversion. Few demonstrations have shown its potential from the aspect of nonlinear photonics; therefore, the mechanisms of momentum conservation among interacting light waves have been concealed by the restricted configuration under the Phase-Matching Condition of periodically poled structures. Here, we unveil a tunable mechanism in the terahertz region by active control of the Phase-Matching Condition. The tunability of backward terahertz-wave parametric oscillation is investigated using a quasi-collinear Phase-Matching model and its frequency range from the sub-terahertz to terahertz region is identified. Transform-limited terahertz-wave pulse is achieved simply by installing a device on the pump propagating line with no cavity. Moreover, the cascading terahertz-wave generation enhances the photon conversion efficiency, thus making nonlinear optics and its applications more promising. The results highlight new capabilities for using modern ferroelectric materials and encourage further research on nonlinear optics.
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Tunable Backward THz-Wave Parametric Oscillation Using a Periodically Poled Lithium Niobate
Conference on Lasers and Electro-Optics, 2018Co-Authors: Kouji Nawata, Yu Tokizane, Yuma Takida, Hiroaki MinamideAbstract:We demonstrated tunable backward terahertz-wave parametric oscillation using a slant-stripe-type periodically poled lithium niobate with a poling period of 53 μm. A novel noncollinear Phase-Matching scheme, quasi-collinear Phase-Matching Condition, produces the wide tunability.
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Backward THz-wave parametric oscillation with tunability
Laser Congress 2017 (ASSL LAC), 2017Co-Authors: Kouji Nawata, Yu Tokizane, Yuma Takida, Hiroaki MinamideAbstract:We presented the first demonstration of backward OPO in the THz region. We found that quasi-collinear Phase-Matching Condition by using a slant-stripe-type PPLN is capable of generating widely tunable THz radiation.
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Parametric generation of terahertz wave pumped by picosecond Ti:sapphire laser with MgO-doped LiNbO3 installed in external enhancement cavity
Nonlinear Frequency Generation and Conversion: Materials Devices and Applications X, 2011Co-Authors: Yuma Takida, Shingo Maeda, Tatsuya Ohira, Hiroshi Kumagai, Shigeki NashimaAbstract:We developed parametric generation of terahertz (THz) wave based on noncollinear Phase-Matching Condition in 5 mol% MgO-doped LiNbO 3 (MgO:LN) crystal synchronously pumped by a low-power mode-locked picosecond Ti:sapphire laser whose average output power was less than 1 W in simple external enhancement cavity. Considering the idler (Stokes) light made an angle of approximately 1 degree with the pump light corresponding to the noncollinear Phase-Matching Condition, we built the extremely-simple doubly-resonant cavity, which composed of only four mirrors, in which the idler light was resonated as well as the pump light simultaneously without any feedback systems for the idler light to reduce the pumping threshold of the THz wave parametric process. As a result, we obtained a broad output THz wave at around 0.9 THz confirmed by Michelson interferometer and achieved the pumping threshold of peak intensity of 50 MW/cm 2 . This threshold is, to the best of our knowledge, the lowest value of externally pumped THz wave parametric oscillation.