Photon Converter With Theoretical And Experimental Study Of The New Photon Source

Supported by the National Natural Science Foundation of China, the Natural Science Foundation of Shandong Province and Research Fund for the Doctoral Program of Higher Education of China, the research mainly investigated the design and optimization of quasi-phase-matching optical frequency converters and a novel pulsed photon resource both theoretically and experimentally.Theoretical study1, We analyzed the influence of random deviations of domain boundary in periodically poled crystals on quasi-phase-matching singly resonant optical parametric oscillators (QPM-SROs). A mathematical method of dealing with this matter is proposed and for the first time the functions of quasi-phase-matched singly resonant oscillation's optical power gain and pumping threshold on random deviations are deduced. The formula we obtained tallies with published experiential equation. The results demonstrate that with the same magnitude, random period errors in periodically poled crystals will reduce a QPM-SRO's gain and drive up its pumping threshold much more largely than random duty cycle errors do.2, Influence of varying effective index and stochastic deviations of domain boundary on the conversion efficiency of difference frequency generation (DFG) in quasi-phase-matching (QPM) waveguides are analyzed. By simplifying the coupled equations of DFG in waveguides, we provide analytical expressions of the conversion efficiency. Four models for random errors of domains and variations of effective index are investigated. The results demonstrate that, when the effective index varies regularly along the waveguides, the normalized conversion efficiency of DFG is reduced and the curves of the efficiency on phase mismatch are no longer sinc~2 functions but ripple profiles, which is different from the situation in bulk crystals. With the same magnitude, random period error casts much larger effect on the conversion efficiency than random duty cycle error, which is similar with the case in bulk crystals.Experimental StudyA Nd:LiYF(Nd:YLF) laser actively Q-switched with a electro-optic La3GasSiOi4(LGS) single crystal was designed. Each end of the Nd:YLF rod was cut at Brewster's angle and the orientation of the two surfaces with respect to the crystal's optic axis was such as to ensure operation at 1.053jxm, which saves the use of polarizor. The dynamic to static rate, the insertion loss and the optical damage threshold of LGS Q-switch is 76%, 2% and 950MW/cm2 respectively. Compared with DKDP, LGS is lack of water-solubility in air. When the pump energy is 120J,...