Dual-etalon cavity ring-down frequency-comb spectroscopy with broad band light source
| DWPI Title: Dual-etalon cavity-ring-down frequency-comb spectrometer system defines spectrums of light which includes multiple optical frequencies, by frequency-comb signals, respectively |
| Abstract: In an embodiment, a dual-etalon cavity-ring-down frequency-comb spectrometer system is described. A broad band light source is split into two beams. One beam travels through a first etalon and a sample under test, while the other beam travels through a second etalon, and the two beams are recombined onto a single detector. If the free spectral ranges (“FSR”) of the two etalons are not identical, the interference pattern at the detector will consist of a series of beat frequencies. By monitoring these beat frequencies, optical frequencies where light is absorbed may be determined. |
| Use: Dual-etalon cavity-ring-down frequency-comb spectrometer system used for distance displacement measurements and communication application. |
| Advantage: Since the measurements require only few microseconds, and no special light source or electronics is required by the system, the high resolution and broad bandwidth measurements are simultaneously provided by the system. The measurement of the gas absorption is not influenced by the multi-mode nature of the light source, as the initial amount of light that is present in the etalons is not depended by the slope. Hence different light sources for the system are enabled. |
| Novelty: The system (100) has two etalons (120,130) which are configured to generate two frequency-comb signals (140,150) in response to the received light beam from broad band light source, respectively. Two spectrums of light that are comprised with multiple optical frequencies spaced by one frequency spacing are defined by two frequency-comb signals, respectively. The multiple beat frequencies of two frequency-comb signals are detected by detector (160). |
| Filed: 3/17/2011 |
| Application Number: US13050430A |
| Tech ID: SD 11655.1 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
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