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二维电子光谱仪器研制与指标分析
岳帅,王专,何小川,朱刚贝,翁羽翔*
作者单位E-mail
岳帅 中国科学院物理研究所软物质物理院重点实验室北京 100190  
王专 中国科学院物理研究所软物质物理院重点实验室北京 100190  
何小川 中国科学院物理研究所软物质物理院重点实验室北京 100190  
朱刚贝 中国科学院物理研究所软物质物理院重点实验室北京 100190  
翁羽翔* 中国科学院物理研究所软物质物理院重点实验室北京 100190 yxweng@aphy.iphy.ac.cn 
摘要:
介绍了一种利用光栅分光,光子回波矩阵构型的二维光谱实验装置.利用快速,高灵敏度的EMCCD对信号进行外差单脉冲测量.并对仪器的指标进行了检测,30 min内12路相干光的相位抖动均方差达到λ/200,19 min内染料IR140溶液外差回波信号的稳定性达到λ/90,通过移动平移台测量了仪器的光谱准确性,相移偏差均方差为λ/90,对平移台移动不均匀导致的光谱失真进行了数值模拟.另外在位相调整时为解决样品泵浦探测信号有干涉的问题,提出了相位移动的方法.将散射信号扣除,大大提高了位相调整的准确性.对染料IR144溶液,光合蛋白色素复合体B820的测量与文献一致.
关键词:  二维光谱,相位稳定,位相调整
DOI:10.1063/1674-0068/28/cjcp1506136
分类号:
基金项目:
Construction of the Apparatus for Two Dimensional Electronic Spectroscopy and Characterization of the Instrument
Shuai Yue,Zhuan Wang,Xiao-chuan He,Gang-bei Zhu,Yu-xiang Weng*
Abstract:
This work describes the construction of a phase-stable two dimensional electronic spectrometer operating in a photon echo mode with optical heterodyne detection, where the diffractive optics were used to realize the passive phase stabilization. In addition, a high speed and sensitive EMCCD was configured for shot-to-shot measurement which effectively improved signal-to-noise ratio. Consequently, the phase stability between a pulse pair split by the diffractive optics was determined in terms of standard deviation to be λ/200 during an observation period of 30 min, while the phase stability of the photon echo signal measured with IR140 is λ/90 in 19 min. In addition, a method of phase-shift in the pump pulse is also presented, which can effectively remove the interference from scattering light in collection of pump-probe transient absorption spectrum. The phase-shift method can improve the accuracy of phase adjustment in 2D electronic spectrum of scattering samples.
Key words:  Two-dimensional electronic spectroscopy, Phase stability, Phase adjustment