The Theoretical Study Of THz-wave Parametric Oscillator Based On MgO:LinbO₃Stimulated Scattering

Terahertz wave is a kind of electromagnetic wave, whose frequency is in1012level. The THz wave we studying frequency ranges between0.1THz and3THz, whose wavelength ranges between30μm and3000μm. THz technology is crossing optical technology and electronic technology. THz wave is called sub-millimeter wave in Electronics and far infrared radiation in Optics. Because of its position in the spectrum and its own unique properties that make it has a wide range of applications in THz radar, safety inspections, medical imaging, communication, environmental monitoring and astronomy and other areas. The key of the study of THz technology is how to get stability, practical terahertz radiation sources. We can get a terahertz radiation sources with low oscillation threshold, operating at room temperature, wide tunable range, miniaturization, based on optical parametric oscillation method. The name of my paper is the theoretical study of THz-wave parametric oscillator (TPO) based on MgO:LiNbO3stimulated scattering. The main contents and key innovative points are as follows:1. The theory of TPO based on the stimulated scattering process is introduced in detail. Give right, detailed derivation of the dynamics process of the stimulated scattering producing THz wave. The THz wave gain and absorption formula of stimulated polariton scattering producing THz wave are calculated.2. Do numerical calculation for MgO:LiNbO3crystals producing terahertz wave. Focuses on calculation of MgO:LiNbO3crystals’dispersion, the non-collinear phase-matching and different condition numerical simulation for MgO:LiNbO3crystals producing terahertz wave. Among them, some literature regarding MgO:LiNbO3crystals of dispersion in THz wave band for error calculation, this paper presents the right calculation.3. Introduce optical parametric oscillator systematically. Theoretically analyses the threshold of TPO. The threshold of intracavity TPO and external-cavity TPO are derived detailed in theory. And we calculate the different factors influence for the threshold of TPO. The calculation results provide specific data for designing and optimizing low threshold TPO. The threshold of TPO pumped by picosecond laser is derived for the first time, including intracavity TPO and external-cavity TPO. And we calculate the different factors influence for the threshold of TPO pumped by picosecond laser. The calculation results provide powerful evidence for experimental study of TPO pumped by picosecond laser. And I propose a design of intracavity TPO pumped by picosecond laser.