Monochromatic-Tunable Terahertz-Wave Sources Based on Nonlinear Frequency Conversion Using Lithium Niobate Crystal
Monochromatic-Tunable Terahertz-Wave Sources Based on Nonlinear Frequency Conversion Using Lithium Niobate Crystal
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DOI：
10.1109/jstqe.2007.911306
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发表时间：
2008-04
影响因子：
4.9
通讯作者：
K. Suizu;K. Kawase
中科院分区：
文献类型：
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作者：
K. Suizu;K. Kawase
本文综述了利用光参量过程产生宽调谐太赫兹（THz）波的研究进展。利用Nd：YAG纳秒调Q激光泵浦掺MgO晶体的参量振荡，实现了结构简单、调谐范围宽（0.7-3 THz）的相干太赫兹光源。为了有效地耦合太赫兹波，我们使用单片光栅耦合器或硅棱镜阵列耦合器。此外，通过引入注入种子的方法，实现了傅里叶变换限制的太赫兹频谱窄化。通过测量低压水蒸气的吸收光谱，确定了约110 MHz（0.003 cm-1）的线宽。采用周期极化晶体差频产生方法，获得了较高的转换效率，实现了连续太赫兹波的产生。这种室温操作，桌面系统有望成为一个广泛的可调太赫兹波源，适合于各种应用。
We review widely tunable terahertz (THz)-wave generation by optical parametric processes using lithium niobate crystal. Applying the parametric oscillation of or a MgO-doped crystal pumped by a nanosecond Q-switched Nd:YAG laser, we realized coherent THz-wave sources with a simple configuration widely tunable in the range of 0.7-3 THz. For efficient coupling of the THz wave, we used a monolithic grating coupler or a Si-prism array coupler. In addition, Fourier transform limited THz-wave spectrum narrowing was achieved by introducing the injection seeding method. A line width of about 110 MHz (0.003 cm-1) was assured by measuring the absorption spectrum of low-pressure water vapor. Using the difference frequency generating method with a periodically poled crystal, we achieved higher conversion efficiency and realized continuous THz-wave generation. This room temperature operated, tabletop system promises to be a widely tunable THz-wave source suited to a variety of applications.