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We report the near-stoichiometric Ti:LiNbO3 strip waveguides fabricated by vapour transport equilibration (VTE) at 1060 C for 12 h and co-diffusion of 4-8 μm wide, 115-nm thick Ti-strips. Optical studies show that these waveguides are monomode at 1.5 μm and have losses of 1.3 and 1.1 dB/cm for the TM and TE modes, respectively. In the waveguide width/depth direction, the mode field follows a Gauss/Hermite-Gauss profile. A secondary ion mass spectrometry study reveals that the Ti profile follows a sum of two error functions along the width direction and a complementary error function in the depth direction. Micro-Raman analysis shows that the Li-composition in the depth direction also follows a complementary error function. The mean Li/Nb ratio in the waveguide layer is about 0.98. The inhomogeneous Li-composition profile results in a varied substrate index in the guiding layer, and the refractive index profile in the guiding layer is given. 相似文献
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近化学计量比铌酸锂晶体组分过冷与临界生长速率研究 总被引：1，自引：1，他引：0
本文在用双坩埚提拉法生长近化学计量比LiNbO3晶体的过程中观察到了组分过冷的实验数据,同时根据Tiller-Chalmers稳定性判据公式半定量计算了近化学计量比LiNbO3晶体临界生长速率的理论值,得到一般电阻加热双坩埚提拉法生长近化学计量比LiNbO3晶体的临界生长速率为0.1mm/h数量级.通过临界生长速率解释了一系列晶体生长的实验结果.提出了一些工艺措施来避免组分过冷,根据这些工艺获得了无包裹体的近化学计量比LiNbO3晶体. 相似文献
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The dielectric behaviour of doped near-stoichiometric lithium niobate in the terahertz range 
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下载免费PDF全文 The dielectric properties of near-stoichiometric LiNbO 3:Fe and LiNbO3:Ce single crystals have been investigated using terahertz time domain spectroscopy in a frequency range of 0.7-1.6 THz at room temperature.When coupled with an applied external optical field,obvious photorefractive effects were observed,resulting in a modulation of the complex dielectric constant for the crystals.The variation in refractive index,| n|,had a linear relationship with the applied light intensity,accompanied by a step-like decrease at high intensity.The findings were attributed to the internal space charge field of the photorefraction and the light-induced domain reversal in the crystals. 相似文献
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