Study Of THz-Radiation Different Frequency Generation Based On Nd:YAG Dual-wavelength Lasers

The terahertz region of the electromagnetic spectrum spans the frequency range between the mid-infrared and the millimeter/microwave. This region has not been exploited fully to date owing to the limited number of suitable radiation sources and detectors. America and Japan are devoting plenty of human and material resources to the THz research. Fully expanding research on THz science and technology has been of important strategetic meaning for our country.The researches including THz radiation source,THz detector and THz transmission and application have been recognized research field in the world. Moreover the research on THz source is the most important aspect of all.The methods of THz generation can be divided into electronics and photonics. We use nonlinear optical difference frequency generation method to obtain THz wave which belongs to photonics.Experimentally. we demonstrated stable dual-wavelength output to the best of our knowledge it is the highest level.Innovations:Experimentally obtained LD end-pumped 1319 and 1338nm dual-wavelength laser with the highest CW and quasi-CW output power 3.53W,2.22W respectively in our research field;Experimentally obtained LD end-pumped 659.5nm and 669nm dual-wavelength laser with the highest CW output power 640mW in our research field;In theory introduced the model of surface-emitted THz wave by difference frequency generation in slant-strip-type PPLN and made necessary analyses based on the model;In theory introduced the model of surface-emitted THz wave by difference frequency generation in DAST and made necessary analyses based on the model.