To provide the ideal light source for difference frequency THz generation,dual-channels and com-electrode RF waveguide CO2 laser has been developed.The laser line from each channel is selected by a grating.Two PZTs are used to control the length of the laser cavity to adjust the laser frequency and pulse setup time.In experiments,two different wavelength lasers are obtained from the dual channels.The voltage on the PZT is tuned to ensure the pulse laser synchronism.The laser has high synchronism probability...