Millimeter-wave signal generation device based on difference frequency generation in a LiTaO3 rectangular waveguide
We have proposed a new DFG-based signal generation device in a LiTaO3 rectangular waveguide. 15 GHz signal was successfully generated from the fabricated device. In this paper, its application for higher-frequency signal generation is discussed.
Generation of continuous-wave millimeter-wave signals in a nonlinear lithium niobate optical waveguide
We demonstrate the generation of cw millimeter-wave signals in LN optical channel waveguides using optical technology. The spectral linewidth of the generated millimeter-wave signals is 2 kHz. The power of the measured cw millimeter-wave signals is almost in proportion to the power multiplication of two input optical signals. In this experiment, the frequency difference of two optical signals is 10 to 40 GHz, and the power of millimeter-wave signals showed variation within 4 dBm.
Nonmarine Cretaceous bivalve assemblages in China
Abstract Bivalve fossils are very abundant in nonmarine Cretaceous rocks in China. Six assemblages are documented: Nakamuranaia-Margaritifera ( Mengyinaia )- Neomiodonoides and Peregrinoconcha-Koreanaia-Pseudohyrioides (Berriasian-Barremian); Trigonioides (T.)-Plicatounio (P.)-Nippononaia (N.) (Aptian-Albian); Plicatounio (P.?)-Maninsonella-Kwanmonia (?) and Trigonioides (Hoffetrigonia)-Trigonioides (Kumamotio?)-Plicatounio (P.) (Cenomanian Santonian); and Pseudohyria-Sainshandia Limnocyrena (Campanian -Maastrichtian). During the Early Cretaceous there appears to have been provincialism of these assemblages, notably the second-named assemblage which is limited to the extreme southwest of China.