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作者机构:Princeton Univ Appl Phys & Mat Sci Grp Engn Quadrangle Princeton NJ 08544 USA
出 版 物:《OPTICS EXPRESS》 (Opt. Express)
年 卷 期:2006年第14卷第21期
页 面:10089-10094页
核心收录:
学科分类:070207[理学-光学] 07[理学] 08[工学] 0803[工学-光学工程] 0702[理学-物理学]
主 题:.Genetic algorithm Raman spectroscopy modulators chirp Shaper dipicolinic acid solution Stokes pulse femtosecond pulse shaping adaptive feedback femtosecond coherent CARS experiment best detection
摘 要:We apply an adaptive feedback loop to control a ultra-violet (UV) femtosecond pulse shaping apparatus. The adaptive feedback control is implemented by a continuous parameter genetic algorithm. We use the adaptive shaper to compensate for the pulse chirp. The genetic algorithm produces a pulse with a width of 115 fs, identical to that of the transformlimited pulse. We then apply the adaptive shaper to the Stokes pulse in a femtosecond coherent anti-Stokes Raman scattering (CARS) experiment on dipicolinic acid solution. The algorithm maximizes the first CARS beat signal at the probe pulse delay of 650 fs. We confirm that a transformlimited Stokes pulse achieves the best detection sensitivity. (c) 2006 Optical Society of America