Second-harmonic generation in two-dimensional periodically poled lithium niobate using second-order quasiphase matching
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Abstract:
Two-dimensional nonlinear photonic crystals of lithium niobate with square lattices were fabricated. In these crystals, efficient quasiphase-matched second-harmonic generation was demonstrated by using second-order quasiphase matching. As a mode-locked Nd:yttritium–aluminum–garnet laser at 1064 nm with 35 ps pulse was used, we obtained an average power of 0.86 mW at 532 nm with 2.73 mW input, which corresponds to 42% internal conversion efficiency. The variations of second-harmonic output with crystal temperature and incident angle were measured. In addition, the relation between the second-harmonic output and reversed duty cycle was studied. All the experimental results are well consistent with simulations.Keywords:
Duty cycle
Potassium niobate
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Quasi-phase-matching
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We fabricated a thick periodically-poled lithium niobate (PPLN) by direct bonding two PPLNs. With a fundamental beam propagating at 23 deg. from x-axis, we observed simultaneous quasi-phase-matching of the second and third-harmonic generations.
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We demonstrate optical coupling to high-Q lithium niobate disks from an integrated lithium niobate waveguide. The waveguides are made by proton exchange in X-cut lithium niobate substrate. The disks with diameter of 4.7 mm and thickness of 1 mm are made from commercial Z-cut lithium niobate wafers by polishing the edges into a spheroidal profile. Both resonance linewidth and cavity ringdown measurements were performed to calculate the Q factor of the resonator, which is in excess of 10(8). Planar coupling represents the most promising technique for practical applications of whispering gallery mode resonators.
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We propose a simple quasi-phase-matching (QPM) scheme in high-order harmonic generation (HHG) based on the approximately linear dependence of the phase mismatch on harmonic order. With this scheme, essentially all the harmonic orders are phase matched simultaneously, with harmonic order $q$ experiencing a $q\mathrm{th}$-order QPM. We validate this proposal by simulations using a semiclassical numerical model of HHG.
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We report on generation of ultra-broadband (>2900 cm−1) near-IR pulses from non-collinear optical parametric amplifier based on congruent lithium niobate and potassium niobate bulk crystals pumped at 800 nm.
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We demonstrate ultra-efficient (~ 1900 ± 500%W -1 cm -2 ) and highly tunable (~ 1.71 nm/K) second harmonic generation from 1530 to 1583 nm via type-0 phase matching in Z-cut periodically poled lithium niobate nanowavguides.
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Quasi-phase-matching
Spontaneous parametric down-conversion
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Potassium niobate
Optical parametric amplifier
Optical Pumping
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Lithium Niobate has been the material of choice for OPO's used to generate mid infrared (2.5 to 4 μm) for atmospheric remote sensing by DIAL [1]. Such systems are capable of measuring a wide range of gaseous hydrocarbon species in the atmosphere. To a large extent the use of lithium niobate in theses OPO's has been a result of its widespread availability in large sizes and with good optical quality. Potassium niobate has always been a potential alternative which has the possible benefit of operating at longer wavelengths. Until recently, it has not been readily available in sizes or with the optical quality required for pulsed laser pumping. However, recent improvements in the growth and treatment of potassium niobate have made it a more realistic alternative.
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Dial
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Potassium niobate
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Abstract Lithium niobate has a number of attractive piezoelectric and ferroelectric properties that have been exploited for many applications. The main purpose of our work was to grow lithium niobate thin films on silicon substrates and make surface acoustic wave (SAW) devices. Theoretical curves of SAW properties of bulk crystals and films lithium niobate on silicon with a coating of silicon oxide were also obtained. The theoretical results include elastic wave properties (velocities and power flow angle) in lithium niobate bulk crystals and SAW properties (velocities and coupling coefficients). Thin films of lithium niobate have been deposited on Si (100) substrates (with SiO2 coatings) by rf magnetron sputtering. Lithium niobate film samples with very good transparency and uniformity were obtained. The film samples were structurally analyzed using Bragg x-ray diffraction (XRD). Lithium niobate XRD peaks for specific sputtering conditions corresponding to thin film orientation of (012), (104) and (110) were identified. Highly textured films showing only one orientation of the lithium niobate could be grown for all those of these above orientation on identical amorphous substrates.
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