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A 100 kHz Pulse Shaping 2D-IR Spectrometer Based on Dual Yb:KGW Amplifiers
The Journal of Physical Chemistry A ( IF 2.7 ) Pub Date : 2018-01-09 00:00:00 , DOI: 10.1021/acs.jpca.7b10259 P.M. Donaldson 1 , G.M. Greetham 1 , D.J. Shaw 1, 2 , A.W. Parker 1 , M. Towrie 1
The Journal of Physical Chemistry A ( IF 2.7 ) Pub Date : 2018-01-09 00:00:00 , DOI: 10.1021/acs.jpca.7b10259 P.M. Donaldson 1 , G.M. Greetham 1 , D.J. Shaw 1, 2 , A.W. Parker 1 , M. Towrie 1
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A high-speed, high-sensitivity and compact two-dimensional infrared (2D-IR) spectrometer based on 100 kHz Yb:KGW regenerative amplifier technology is described and demonstrated. The setup is three color, using an independent pump OPA and two separately tunable probe OPAs. The spectrometer uses 100 kHz acousto-optic pulse shaping on the pump beam for rapid 2D-IR acquisitions. The shot-to-shot stability of the laser system yields excellent signal-to-noise figures (∼10 μOD noise on 5000 laser shots). We show that the reduced bandwidth of the Yb:KGW amplifiers in comparison with conventional Ti:sapphire systems does not compromise the ability of the setup to generate high-quality 2D-IR data. Instrument responses of <300 fs are demonstrated and 2D-IR data presented for several systems of interest to physical chemists, showing spectral diffusion in NaSCN, amide I and II bands of a β sheet protein and DNA base-pair–backbone couplings. Overall, the increased data acquisition speed, intrinsic stability, and robustness of the Yb:KGW lasers are a significant step forward for 2D-IR spectroscopy.
中文翻译：
基于双Yb：KGW放大器的100 kHz脉冲整形2D-IR光谱仪
描述并演示了基于100 kHz Yb：KGW再生放大器技术的高速，高灵敏度，紧凑型二维红外（2D-IR）光谱仪。设置为三种颜色，使用一个独立的泵OPA和两个分别可调的探头OPA。光谱仪在泵浦光束上使用100 kHz声光脉冲整形，以快速进行2D-IR采集。激光系统的逐次拍摄稳定性可产生出色的信噪比（5000次激光拍摄时约10μOD噪声）。我们表明，与传统的Ti：蓝宝石系统相比，Yb：KGW放大器的带宽降低并不损害设置生成高质量2D-IR数据的能力。演示了<300 fs的仪器响应，并提供了物理化学家感兴趣的几种系统的2D-IR数据，显示在NaSCN，β折叠蛋白的酰胺I和II带以及DNA碱基对-骨干偶联中的光谱扩散。总体而言，Yb：KGW激光器提高的数据采集速度，固有稳定性和耐用性是2D-IR光谱学向前迈出的重要一步。
更新日期：2018-01-09
中文翻译：
基于双Yb：KGW放大器的100 kHz脉冲整形2D-IR光谱仪
描述并演示了基于100 kHz Yb：KGW再生放大器技术的高速，高灵敏度，紧凑型二维红外（2D-IR）光谱仪。设置为三种颜色，使用一个独立的泵OPA和两个分别可调的探头OPA。光谱仪在泵浦光束上使用100 kHz声光脉冲整形，以快速进行2D-IR采集。激光系统的逐次拍摄稳定性可产生出色的信噪比（5000次激光拍摄时约10μOD噪声）。我们表明，与传统的Ti：蓝宝石系统相比，Yb：KGW放大器的带宽降低并不损害设置生成高质量2D-IR数据的能力。演示了<300 fs的仪器响应，并提供了物理化学家感兴趣的几种系统的2D-IR数据，显示在NaSCN，β折叠蛋白的酰胺I和II带以及DNA碱基对-骨干偶联中的光谱扩散。总体而言，Yb：KGW激光器提高的数据采集速度，固有稳定性和耐用性是2D-IR光谱学向前迈出的重要一步。
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