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出 处:《光学学报》2009年第12期3477-3481,共5页Acta Optica Sinica
基 金:河北省教育厅科技攻关计划项目(Z2007228);河北科技大学青年基金(2006JC-17)资助课题
摘 要:从非线性光学电磁场理论出发,分别数值计算了硼酸锂(LBO)晶体基频光波长1064nm的Ⅰ类和Ⅱ类倍频相位匹配角及有效非线性系数。Ⅰ类相位匹配角在第一象限的范围约是(34°~90°,0~24°),有效非线性系数的平方在匹配角约为(42.2°,56°)时有最大值,匹配角约为(90°,45.6°)时有次极大值,且最大值与次极大值近似相等;Ⅱ类相位匹配角在第一象限的范围约为(0-90°,45.5°~90°),有效非线性系数的平方在匹配角约为(0,90°)时有最大值。Abstract From nonlinear optics and electromagnetic field theory, type Ⅰand type Ⅱ frequency-doubling phasematching angle and effective nonlinear coefficient of LBO crystal whose fundamental frequency wavelength is 1064 nm are respectively calculated with numerical method. The range of type Ⅰ phase-matching angle in the first quadrant is about (34°- 90°, 0--24°), and the square of the effective nonlinear coefficient have a maxmum value when the phase-matching angle approximates (42.2°, 56°) and have the second largest value when the phase-matching angle approximates (90°,45.6°) . The two values are approximately equivalent. The range of type Ⅱ phase-matching angle in the first quadrant is about(0-90°, 45.5°- 90°) , and the square of the effective nonlinear coefficients have a maximum value when the phase-matching angle approximates (0,90).
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