Dispersion-compensated supercontinuum generation for ultrabroadband multiplex coherent anti-Stokes Raman scattering spectroscopy
Dispersion-compensated supercontinuum generation for ultrabroadband multiplex coherent anti-Stokes Raman scattering spectroscopy
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DOI：
10.1002/jrs.1436
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发表时间：
2006-01-01
影响因子：
2.5
通讯作者：
Hamaguchi, H
中科院分区：
文献类型：
--
作者：
Kano, H;Hamaguchi, H
我们已经在样品位置产生了一个色散补偿的皮秒超宽带超连续光源，而不需要使用任何额外的补偿器，如棱镜对或光栅对。通过优化光子晶体光纤长度得到的色散补偿超连续谱被用作超宽带多路相干反斯托克斯拉曼散射(CARS)光谱的斯托克斯激光光源。由于窄带泵浦脉冲和斯托克斯超连续谱脉冲之间存在优化的时间重叠，有效地获得了频谱覆盖率超过2800 cm(-1)的CARS信号。此外，不仅当泵浦脉冲和斯托克斯超连续谱在时间上重叠时，而且当泵浦脉冲跟随超连续谱时，也观察到了振动共振的CARS信号。这可以用超连续谱对振动相干性的脉冲激发和窄带泵浦脉冲的后续探测来解释。利用色散补偿的超连续谱，通过控制窄带激光与超连续谱之间的延迟时间，不仅可以进行频域多路CARS测量，还可以进行时间域脉冲CARS测量。这两种技术都可以应用于显微光谱学，以获得较宽的振动共振光谱范围和抑制非共振本底。版权所有(C)2006 John Wiley&Sons，Ltd.
We have generated a dispersion-compensated picosecond ultrabroadband supercontinuum light source at the sample position without using any additional compensator such as a prism pair or a grating pair. The dispersion-compensated supercontinuum, which is obtained just by optimizing the length of a photonic crystal fiber, has been used as a Stokes laser source for ultrabroadband multiplex coherent anti-Stokes Raman scattering (CARS) spectroscopy. Owing to an optimized temporal overlap between the narrowband pump and the Stokes supercontinuum pulses, a CARS signal has been obtained efficiently with a spectral coverage of more than 2800 cm(-1). Furthermore, a vibrationally resonant CARS signal is observed not only when the pump pulse and the Stokes supercontinuum are temporally overlapped but also when the pump pulse follows the supercontinuum. It can be explained by an impulsive excitation of the vibrational coherence by the supercontinuum and a subsequent probe by a narrowband pump pulse. Using the dispersion-compensated supercontinuum, we can perform not only the frequency-domain multiplex CARS but also the time-domain impulsive CARS measurement by controlling the delay time between the narrowband laser and the supercontinuum. Both these techniques can be applied to microspectroscopy in order to obtain the wide spectral range of vibrational resonances and the suppression of the nonresonant background. Copyright (C) 2006 John Wiley & Sons, Ltd.