Journal
OPTICS EXPRESS
Volume 25, Issue 4, Pages 4403-4412Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.25.004403
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Funding
- European Research Council: Advanced Grant STRATUS (ERC-AdG) [291198]
- Proof of Concept Grant MISSION (ERC-POC) [665635]
- Marie Curie actions (FP7-PEOPLE-IEF) [328110]
- Horizon 2020 [654148]
- European Research Council (ERC) [665635] Funding Source: European Research Council (ERC)
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We introduce a birefringent interferometer for Fourier transform (FT) spectroscopy in the mid-infrared, covering the vibrational fingerprint region (5-10 mu m, 1000-2000 cm(-1)), which is crucial for molecular identification. Our interferometer employs the crystal calomel (Hg2Cl2), which combines high birefringence (n(e)-n(o)approximate to 0.55) with a broad transparency range (0.38-20 mu m). We adopt a design based on birefringent wedges, which is simple and compact and guarantees excellent delay accuracy and long-term stability. We demonstrate FTIR spectroscopy, with a frequency resolution of 3 cm(-1), as well as two-dimensional IR (2DIR) spectroscopy. Our setup can be extended to other spectroscopic modalities such as vibrational circular dichroism and step-scan FT spectroscopy. (C) 2017 Optical Society of America
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