Farrell Kieran M, Ostrander Josh S, Jones Andrew C, Yakami Baichhabi R, Dicke Sidney S, Middleton Chris T, Hamm Peter, Zanni Martin T
Opt Express. 2020 Oct 26;28(22):33584-33602. doi: 10.1364/OE.409360.
The majority of 2D IR spectrometers operate at 1-10 kHz using Ti:Sapphire laser technology. We report a 2D IR spectrometer designed around Yb:KGW laser technology that operates shot-to-shot at 100 kHz. It includes a home-built OPA, a mid-IR pulse shaper, and custom-designed electronics with optional on-chip processing. We report a direct comparison between Yb:KGW and Ti:Sapphire based 2D IR spectrometers. Even though the mid-IR pulse energy is much lower for the Yb:KGW driven system, there is an 8x improvement in signal-to-noise over the 1 kHz Ti:Sapphire driven spectrometer to which it is compared. Experimental data is shown for sub-millimolar concentrations of amides. Advantages and disadvantages of the design are discussed, including thermal background that arises at high repetition rates. This fundamental spectrometer design takes advantage of newly available Yb laser technology in a new way, providing a straightforward means of enhancing sensitivity.
大多数二维红外光谱仪采用钛宝石激光技术，工作频率为1 - 10千赫兹。我们报道了一种基于镱：KGW激光技术设计的二维红外光谱仪，它能以100千赫兹的频率逐次运行。它包括一个自制的光学参量放大器（OPA）、一个中红外脉冲整形器以及带有可选片上处理功能的定制设计电子设备。我们报道了基于镱：KGW和基于钛宝石的二维红外光谱仪之间的直接比较。尽管对于由镱：KGW驱动的系统，中红外脉冲能量要低得多，但与它所比较的1千赫兹钛宝石驱动的光谱仪相比，其信噪比提高了8倍。给出了亚毫摩尔浓度酰胺的实验数据。讨论了该设计的优缺点，包括高重复率下产生的热背景。这种基本的光谱仪设计以一种新的方式利用了新出现的镱激光技术，提供了一种提高灵敏度的直接方法。
