Second harmonic generation in a domain-inverted MgO-doped LiNbO3 waveguide by using a polarization axis inclined substrate
Second harmonic generation in a domain-inverted MgO-doped LiNbO3 waveguide by using a polarization axis inclined substrate
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使用偏振轴倾斜基底在畴反转掺镁 LiNbO3 波导中产生二次谐波
DOI：
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发表时间：
1997
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影响因子：
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通讯作者：
M. Hatori
中科院分区：
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作者：
Shinichiro Sonoda;Isao Tsuruma;M. Hatori
用退火质子交换87°Z切 %掺杂LiNbO_3(MgO：LN)光波导实现了准相位匹配倍频。通过在3°Y切和87°Z切的MgO：LN中施加电场，实现了磁畴反转的形成。在3°Y切和87°Z切的MgO：LN衬底上，偏振轴与表面成3°角θ倾斜。磁区反转是在平行于偏振轴的方向上形成的，就像针扎进衬底一样。磁区反转的深度为2.5μm，周期为4.75μm，当θ角为0°时，磁区反转深度约为X切和Y切衬底深度的2.5倍。利用可调谐外腔激光二极管作为基波光源，在域反转衬底上形成波导，获得了波长为475 nm、功率为37 mW的蓝光，归一化二次谐波转换效率为300%/W cm~2，相互作用长度为10 mm。
We demonstrate quasiphase matched second harmonic generation by use of annealed proton-exchanged 87° Z-cut MgO 5 mol % doped LiNbO3 (MgO:LN) waveguides supporting a TE-mode guided wave. Formation of a domain inversion was achieved by applying electric fields in 3° Y-cut and 87° Z-cut MgO:LN. In 3° Y-cut and 87° Z-cut MgO:LN substrates, a polarization axis inclines at an angle θ equal to 3° to the surface. The domain inversion was formed in a direction parallel to the polarization axis like needles stuck into the substrate. The depth of the domain inversion was 2.5 μm with a period of 4.75 μm. The depth was about 2.5 times deeper than that in X- and Y-cut substrate at an angle θ equal to 0°. By forming a waveguide on the domain-inverted substrate, a blue light of wavelength 475 nm, and a power of 37 mW has been obtained and a normalized second harmonic conversion efficiency was 300%/W cm2 with interaction length of 10 mm, using a tunable external cavity laser diode as a fundamental wave source.