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Title: Real-time multiplexed digital cavity-enhanced spectroscopy

Cavity-enhanced spectroscopy is a sensitive optical absorption technique but one where the practical applications have been limited to studying small wavelength ranges. In addition, this Letter shows that wideband operation can be achieved by combining techniques usually reserved for the communications community with that of cavity-enhanced spectroscopy, producing a multiplexed real-time cavity-enhanced spectrometer. We use multiple collinear laser sources operating asynchronously and simultaneously while being detected on a single photodetector. This is synonymous with radio frequency (RF) cellular systems in which signals are detected on a single antenna but decoded uniquely. Here, we demonstrate results with spectra of methyl salicylate and show parts-per-billion per root hertz sensitivity measured in real-time.
 [1] ;  [2] ;  [3] ;  [3] ;  [4] ;  [5] ;  [1]
  1. UNSW Canberra, Canberra (Australia)
  2. John Hopkins Univ., Baltimore, MD (United States)
  3. Defence Science and Technology Organisation, Victoria (Australia)
  4. Belmont Univ., Nashville, TN (United States)
  5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 0146-9592; OPLEDP; TRN: US1600418
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Optics Letters
Additional Journal Information:
Journal Volume: 40; Journal Issue: 19; Journal ID: ISSN 0146-9592
Optical Society of America (OSA)
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
Country of Publication:
United States
74 ATOMIC AND MOLECULAR PHYSICS; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; spectrometers and spectroscopic instrumentation; absorption; spectroscopy infrared; spectroscopy laser