Group-velocity-matched noncollinear second-harmonic generation in quasi-phase matching
Group-velocity-matched noncollinear second-harmonic generation in quasi-phase matching
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DOI：
10.1364/josab.22.001283
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发表时间：
2005-06
影响因子：
1.9
通讯作者：
N. Fujioka;S. Ashihara;H. Ono;T. Shimura;K. Kuroda
中科院分区：
文献类型：
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作者：
N. Fujioka;S. Ashihara;H. Ono;T. Shimura;K. Kuroda
我们演示了在非共线准相位匹配(QPM)几何结构下产生80fS脉冲的群速度匹配二次谐波。利用3 mm长的周期极化的LiNbO4晶体，以50%的效率获得了宽度为100fS、带宽为11 nm、中心波长为0.78微米的二次谐波脉冲。我们还数值研究了转换效率和脉冲持续时间与泵浦光强、传输长度和非共线角的关系。结果表明，我们的群速度匹配方案所需的泵浦强度比传统的共线QPM方案要低得多。
We demonstrate group-velocity-matched second-harmonic generation of 80-fs pulses under noncollinear quasi-phase-matching (QPM) geometry. Second-harmonic pulses of 100-fs duration, 11-nm bandwidth, and0.78-µm center wavelength were generated with 50% efficiency with 3-mm-long periodically poled lithium niobate. We have also numerically studied the dependence of conversion efficiency and pulse durations on pump intensity, propagation length, and noncollinear angle. It is confirmed that our group-velocity-matching scheme requires a much lower pump intensity than the conventional collinear QPM scheme.