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thz wave
Research on THz wave generated by difference-frequency in nonlinear crystal
      
THz wave generated by difference-frequency in nonlinear crystal in normal temperature is theoretically studied.
      
With this method, THz wave can be generated without rigorous condition and can work continuously for a long period of time in room temperature.
      
The χ(2) interaction between an intense terahertz (THz) pulse and a weak optical probe is addressed, and a general solution obtained for the situation of an undepleted THz wave.
      
Wide tunable terahertz (THz) wave generation was successfully demonstrated utilizing a grating coupler fabricated on the surface of a LiNbO3 crystal which was pumped by a Q-switched Nd:YAG laser.
      
The amplification constant of 28dB/mm is achieved at THz wave region by applying the monotron to a distributed amplifier and is sufficient to overcome power loss in a transmission line.
      
In addition, a wide band frequency tunable electromagnetic wave source may be developed at THz wave region by providing a low loss microstrip line resonator with field emission array due to the gate voltage dependent phase constant of the line.
      
THz wave sensing for petroleum industrial applications
      
The terahertz region is between the optical wave and the so-called microwaves; it had not been studied until 1963, when Nishizawa started the development of a THz wave generation based on the character of lattice or molecular vibrations.
      
Frequency tunable high-power THz wave generation has been successfully achieved utilizing lattice resonance of LiNbO3 and GaP crystals, respectively.
      
Figure 4 shows measured THz wave forms for different positions of the metal edge with respect to the tip.
      
The THz wave form is obtained by measuring the photocurrent while varying the time delay of the optical pulses.
      
The combination of these effects can provide great flexibility in the design of new devices for THz or sub-THz wave generation.
      
The scheme of low-temperature-grown GaAs is one representative for this purpose and, indeed, is well utilized for THz wave generation sources.
      
We have successfully observed THz wave of the compact THz system.
      
 

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