Terahertz Spectroscopy of Gas Mixtures with Dual Quantum Cascade Laser Frequency Combs
- Princeton Univ., NJ (United States); Univ. of Wroclaw (Poland)
- Princeton Univ., NJ (United States)
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Univ. of Notre Dame, IN (United States)
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Terahertz laser frequency combs based on quantum cascade lasers provide coherent, broadband, electrically pumped, THz radiation sources for use in future spectroscopic applications. In this work, we explore the feasibility of such lasers in a dual-comb spectroscopy configuration for the detection of multiple molecular samples in the gas phase. The lasers span approximately 180 GHz of optical bandwidth, centered at 3.4 THz, with submilliwatt total optical power. One of the main advantages of dual-comb spectroscopy is its high speed, which opens up the possibility for direct observations of chemical reaction dynamics in the terahertz spectral region. As a proof-of-concept, we recorded continuously evolving spectra from gas mixtures with 1 ms temporal resolution.
- Research Organization:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA); Defense Advanced Research Projects Agency (DARPA); Foundation for Polish Science (FNP)
- Grant/Contract Number:
- AC04-94AL85000; NA-0003525; W31P4Q-16-1-0001; HR00111920006; START 085.2018
- OSTI ID:
- 1770795
- Report Number(s):
- SAND-2021-2540J; 694503
- Journal Information:
- ACS Photonics, Vol. 7, Issue 5; ISSN 2330-4022
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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