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Study on Spontaneous Parametric Conversion in BBO Crystal Pumped by Femtosecond Pulses

Author: YinJuanJuan
Tutor: LuPeiXiang
School: Huazhong University of Science and Technology
Course: Optical Engineering
Keywords: Spontaneous parametric conversion Phase matching Group-velocity mismatch Color cone radiation Gain coefficient Modulation instability
CLC: TN244
Type: Master's thesis
Year: 2009
Downloads: 25
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Abstract


Complex nonlinear process of spontaneous parametric conversion effect is due to the combined effects of monochromatic pump photon flux quantum vacuum noise noncentrosymmetric media generated . When high intensity ultrashort pulse laser pumped nonlinear crystals , the spontaneous generation of the frequency upconversion light and converted light , and forming a color in the space conical radiation (CCE) of the phenomenon . In view of the important significance of spontaneous parametric conversion effect in the field of academic and applied conical radiation phenomena femtosecond laser pumped nonlinear optical crystals due to spontaneous parametric down conversion color theory and experimental research , the following key elements : ( 1) starting from the Maxwell equations , the theoretical optical pulse transmission in a nonlinear crystal three-wave coupled equations were calculated according to the phase matching principle match the conditions of the class I and class II BBO crystal phase -matching angle . Taking into account the important influence of the group velocity mismatch in the beam transmission , the calculation of the second harmonic of the process of group velocity mismatch and beam walk-off angle . ( 2 ) to study the phenomenon of color conical radiation the macro mechanism - spatial and temporal modulation instability . Only when the noise signal in order to meet certain time and space frequency dispersion relation is amplified , the steady-state solution exists . The theoretical analog modulation through the homeostasis time and space , calculate the frequency the Ωs and time frequency Ω gain perturbation in a different space . ( 3 ) successfully observed using femtosecond pulse laser pumped I BBO crystal color conical radiation phenomena . Experimental Study of a a conical radiant color phenomenon and the pump power, the relationship between the parameters of the pulse width, the crystal length , and a beam incident angle . And theory to simulate the impact of various parameters on the CCE , compared with the experimental results and the theoretical modeling and experimental results are in line with , and thus made ??a reasonable interpretation of various experimental phenomena .

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