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Since the photorefractive effect was discovered in LiNbO3 and LiTaO3, a great number of reports have appeared concerning the optical absorption bands originating from intrinsic defects or such extrinsic impurities as transition metals and rare-earth elements [1–2]. The continuing interest in this topic primarily lies in revealing the basic mechanisms underlying the photorefractive and other...
Difference in the terahertz generations from three types of 1 mol % MgO-doped stoichiometric LiTaO3 crystals were analyzed. Weak single-cycle, multi-cycles, and strong single-cycle terahertz pulses were radiated at bulk, periodically poled, and angle-cut structures, respectively. The three different types of terahertz generation depend on the phase-matching process.
Optical constants of nonlinear crystals for terahertz generation were measured by terahertz time-domain spectroscopy. Congruent and stoichiometric crystals of lithium niobate (LiNbO3) and lithium tantalate (LiTaO3) were compared in the 0.1–2 THz range. Stoichiometric lithium tantalate (SLT) was estimated as a most promising single crystal to generate efficient THz source in an ordinary polarization...
Refractive indices of a 1 mol % MgO-doped stoichiometric LiTaO3 (SLT) crystal in the region of 0.85 ∼ 1.59 THz and for the temperature range of 80 ∼ 300 K were deduced via the terahertz generation process using a fanned-out periodically poled SLT. In addition, temperature-dependent Sellmeier equation was derived.
Frequency and bandwidth of terahertz wave were simultaneously tuned by selectively choosing domain period in a fan-shaped periodically poled stoichiometric lithium tantalate crystal.
Simultaneous tunable terahertz wave generation with the frequency range (0.85 ∼ 1.59 THz) and the bandwidth range (43 ∼ 78 GHz) was demonstrated using a fan-shaped periodically poled stoichiometric lithium tantalate crystal.
We report on the method that terahertz generation and detection were simultaneously performed via non-collinear optical parametric interaction in a nonlinear crystals using a Si-photodiode. The bandwidth manipulation between broad 3.3 THz and narrow 45GHz bandwidths was demonstrated at single quasi-phase-matching crystal using the position-dependence of the crystal.
Tunable terahertz pulses were generated in fan-out periodically poled structure with QPM period of 50 to 90 μm. Center frequency was tuned from 0.94 to 1.55 THz with as narrow as band-width of 20 GHz.
We compare the oscillation thresholds and slope efficiencies in 10 ns pulsed eyesafe OPOs based on MgO-doped PPSLT and monolithic KTP. The optimal combination of low threshold and high slope efficiency is achieved with PPSLT.
We compare the oscillation thresholds and slope efficiencies in 10 ns pulsed eyesafe OPOs based on MgO-doped PPSLT and monolithic KTP. The optimal combination of low threshold and high slope efficiency is achieved with PPSLT.
We demonstrated the finest twin structure ever reported in crystal quartz with a period of 17.8 ??m. Second harmonic 266 nm light of 0.10 mW was obtained by the third-order QPM in quartz. from a ns-pulsed doubled Nd:YVO4.
We examined second harmonic generation efficiency depending on input polarization state of the fundamental wave in crystal-quartz wavelength converter. We found the optimum polarization state for efficient SHG at 532 nm.
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