@article{oai:nagoya.repo.nii.ac.jp:00009389,
 author = {Suizu, Koji and Kawase, Kodo and 川瀬, 晃道},
 issue = {2},
 journal = {IEEE Journal of Selected Topics in Quantum Electronics},
 month = {Mar},
 note = {We review widely tunable terahertz (THz)-wave generation by optical parametric processes using lithium niobate crystal. Applying the parametric oscillation of LiNbO_{3} or a MgOdoped LiNbO_{3} 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 100 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 LiNbO_{3} 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.},
 pages = {295--306},
 title = {Monochromatic-Tunable Terahertz-Wave Sources Based on Nonlinear Frequency Conversion Using Lithium Niobate Crystal},
 volume = {14},
 year = {2008}
}