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利用外加电场极化的方法,分别研究了三种不同方式布置的极化电极对C向切割LiNbO3< /sub>晶体极化反转畴扩张的影响.实验结果表明在相同极化条件下,当极化电极长度方向与六边 形反转畴一对边呈90°和0°角时,极化扩张速度分别为0.089μm/ms和0.011μm/ms.实验结果揭示,为了有效地控制极化占空比,在制备一维准相位匹配LiNbO3晶体时应 避免极化电极与六边形反转畴壁中一对边呈90°的情况.
关键词:
周期极化
极化扩张
准相位匹配 相似文献
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采用1.06 μm激光泵浦准相位匹配周期极化铌酸锂(PPMgLN)晶体光参量振荡器,实现高功率高效率高重复频率3.84 μm中红外激光输出。泵浦源为椭圆光斑1.06 μm激光,PPMgLN晶体MgO摩尔分数为5%,光参量振荡器为外腔单谐振结构,采用e→e+e相位匹配,利用了PPMgLN晶体的最大非线性系数。在1.06 μm激光功率为73 W,声光Q开关工作频率为7.5 kHz的条件下,获得平均功率8.3 W,波长3.84 μm激光输出,光-光转换斜率效率14.1%,水平和垂直方向光束质量平方因子分别为1.94,4.57。 相似文献
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Compact efficient optical parametric generator internal to a Q-switched Nd:YVO4 laser with periodically poled MgO:LiNbO3
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This paper demonstrates a compact efficient optical parametric
generator internal to a Q-switched diode-end-pumped Nd:YVOquasi-phase-matching,
intracavity optical parametric generator, periodically poled
MgO-doped lithium niobate (PPMgLN) Project supported by the National
Natural Science Foundation of China (Grant Nos 10474071 and
60671036). 4265K, 4260F, 4270 This paper demonstrates a compact efficient optical parametric
generator internal to a Q-switched diode-end-pumped Nd:YVOquasi-phase-matching,
intracavity optical parametric generator, periodically poled
MgO-doped lithium niobate (PPMgLN) Project supported by the National
Natural Science Foundation of China (Grant Nos 10474071 and
60671036). 4265K, 4260F, 4270 This paper demonstrates a compact efficient optical parametric
generator internal to a Q-switched diode-end-pumped Nd:YVOquasi-phase-matching,
intracavity optical parametric generator, periodically poled
MgO-doped lithium niobate (PPMgLN) Project supported by the National
Natural Science Foundation of China (Grant Nos 10474071 and
60671036). 4265K, 4260F, 4270 This paper demonstrates a compact efficient optical parametric
generator internal to a Q-switched diode-end-pumped Nd:YVOquasi-phase-matching,
intracavity optical parametric generator, periodically poled
MgO-doped lithium niobate (PPMgLN) Project supported by the National
Natural Science Foundation of China (Grant Nos 10474071 and
60671036). 4265K, 4260F, 4270 This paper demonstrates a compact efficient optical parametric
generator internal to a Q-switched diode-end-pumped Nd:YVOquasi-phase-matching,
intracavity optical parametric generator, periodically poled
MgO-doped lithium niobate (PPMgLN) Project supported by the National
Natural Science Foundation of China (Grant Nos 10474071 and
60671036). 4265K, 4260F, 4270 This paper demonstrates a compact efficient optical parametric
generator internal to a Q-switched diode-end-pumped Nd:YVO$_{4}$
laser with periodically poled MgO:LiNbO3(PPMgLN). With the
Q-switch set at a repetition rate of 25kHz and the PPMgLN crystal
operated at room temperature (25\du\,), the intracavity optical
parametric generator threshold was reached as a diode pump power of
0.9\,W. A maximum signal output power of 0.34W with a pulse width
of 25\,ns and a beam quality factor of 1.4 was obtained at an
incident diode power of 3.4\,W, leading to a conversion efficiency of
10{\%} with a slope efficiency of 14.4{\%}. By varying the crystal
temperature from 25 to 200\du, the output signal wavelengths were
tuned in range of 1506--1565\,nm. Over a 30-minutes interval, the
instability of the signal power was measured to be less than 1{\%}.
In addition, the threshold pump intensity for the intracavity optical
parametric generator is theoretically investigated, and the obtained
result is in good agreement with the experimental results. 相似文献
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Dielectric superlattices for nonlinear optical effects 总被引:2,自引:0,他引:2
Dielectric superlattices show a lot of new phenomena that are promising in applications, such as nonlinear optical frequency conversion and optical bistability. This paper reviews the main achievements in this field. Much has been focused on the work done in our Lab. Since 1980, we have extended the concept of superlattice from semiconductor to dielectrics. When quasi-phase-matching technique is introduced into a quasiperiodic dielectric superlattice, more interesting phenomena can occur. For example, multiwavelength second-harmonic generation and coupled parametric processes such as direct third-harmonic generation have been realized with high efficiency. A new mechanism for optical bistability in a 2-dimensional dielectric superlattice, i.e. a 2-dimensional nonlinear photonic crystal, has been proposed theoretically had proved experimentally. 相似文献
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The maximal tolerance parameters of poling period and phase-matching, temperature in second harmonic generation (SHG) using periodically poled RbTiOAsO4(PPRTA) as a function of the fundamental wavelength are investigated theoretically. The tolerance of the poling period ΔΛ of PPRTA is found larger than that of PPLN and PPKTP when the fundamental wavelength is beyond 2 μm, which reaches its maximum ΔΛmax for PPRTA at a fundamental wavelength of 2.7433 μm. However, the tolerance for the phase-matching temperature ΔT of PPRTA is found smaller than that of PPLN and PPKTP with an exception that PPRTA has a larger tolerance of the temperature or a larger temperature phase-matching bandwidth at fundamental wavelength of 2.2474 μm, where the maximum of ΔT(ΔTmax) is obtained. Furthermore, the tuning characteristics of the optical parametric processes using PPRTA for collinear quasi-phase-matching (CQPM) is analyzed. The combination of temperature tuning and poling period tuning enables a quasi-continuous wavelength tuning range of 1493.2-1593.7 nm for the signal and 3201.8-3699.2 nm for the idler, where poling period of 39 μm, 39.5 μm and 40 μm and a temperature between 20 and 120° have been employed in the corresponding theoretical analysis. 相似文献
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