Efficient Cherenkov-Type Phase-Matched Widely Tunable Terahertz-Wave Generation via an Optimized Pump Beam Shape
Efficient Cherenkov-Type Phase-Matched Widely Tunable Terahertz-Wave Generation via an Optimized Pump Beam Shape
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DOI：
10.1143/apex.2.032302
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发表时间：
2009-02
影响因子：
2.3
通讯作者：
T. Shibuya;Toshihiro Tsutsui;K. Suizu;T. Akiba;K. Kawase
中科院分区：
文献类型：
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作者：
T. Shibuya;Toshihiro Tsutsui;K. Suizu;T. Akiba;K. Kawase
我们展示了一种切伦科夫型相位匹配的方法，用于单色太赫兹波的产生，使用差频产生过程与锂晶体。在切伦科夫型相位匹配过程中，当使用块状锂酸盐晶体时，泵浦波的光束直径导致产生太赫兹波的相位失配。采用柱面透镜优化泵浦光的形状，减小了相位失配，保证了高转换效率，特别是在高频区。我们成功地产生了单色太赫兹波在0.2至4.0太赫兹范围内与一个简单的配置。
We demonstrated a Cherenkov-type phase-matching method for monochromatic THz-wave generation using the difference frequency generation process with a lithium niobate crystal. In Cherenkov-type phase-matching process, when the bulk lithium niobate crystal is used, the beam diameter of pump waves causes the phase mismatching for generating THz-wave. We decreased the phase-mismatch by optimizing the pump beam shape with cylindrical lenses, and ensured high conversion efficiency especially in the high-frequency region. We successfully generated monochromatic THz waves across the 0.2- to 4.0-THz range with a simple configuration.