Study of a Mode Separation Due to Polarization Existing in a Cavity-Enhanced Absorption Spectroscopy
A special phenomenon of resonance mode separation is observed during the study of a high sensitivity folded-cavity enhanced absorption spectroscopy for the measurement of trace gases. The phenomenon affects the measurement of gas absorption spectrum in the cavity. This resonant mode separation pheno...
Guardado en:
| Autores principales: | , , , |
|---|---|
| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
|
| Materias: | |
| Acceso en línea: | https://doaj.org/article/dcacfac21db241a6b62475f6e7a57fa8 |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| id |
oai:doaj.org-article:dcacfac21db241a6b62475f6e7a57fa8 |
|---|---|
| record_format |
dspace |
| spelling |
oai:doaj.org-article:dcacfac21db241a6b62475f6e7a57fa82021-11-11T19:06:42ZStudy of a Mode Separation Due to Polarization Existing in a Cavity-Enhanced Absorption Spectroscopy10.3390/s212171011424-8220https://doaj.org/article/dcacfac21db241a6b62475f6e7a57fa82021-10-01T00:00:00Zhttps://www.mdpi.com/1424-8220/21/21/7101https://doaj.org/toc/1424-8220A special phenomenon of resonance mode separation is observed during the study of a high sensitivity folded-cavity enhanced absorption spectroscopy for the measurement of trace gases. The phenomenon affects the measurement of gas absorption spectrum in the cavity. This resonant mode separation phenomenon of the resonant cavity is different from the resonant modes previously observed in linear-cavity enhanced absorption spectroscopy systems. To explore the mechanism of this phenomenon, a series of hypotheses are proposed. The most likely reason among these hypotheses is based on the different reflectance properties of the plane mirror at the fold of the cavity for S-polarized light and P-polarized light. Based on the matrix calculation method, the different reflectance and phase shift of the plane mirror for S-polarized light and P-polarized light are analyzed theoretically, and the results are in better agreement with the phenomena observed in the experiment. Finally, in order to eliminate the resonant mode separation phenomenon, line polarizers were added. By improving the system, the cavity enhanced absorption spectrum of residual water vapor in the cavity was successfully measured, and a minimum detectable absorption coefficient of <i>α</i><sub>min</sub> = 7.6 × 10<sup>−9</sup> cm<sup>−1</sup> can be obtained in a single laser scan of 10 s.Shiyu GuanDingbo ChenHuilin CaoZhongqi TanMDPI AGarticlelaser spectroscopycavity-enhanced absorption spectroscopyresonant cavitypolarized lightChemical technologyTP1-1185ENSensors, Vol 21, Iss 7101, p 7101 (2021) |
| institution |
DOAJ |
| collection |
DOAJ |
| language |
EN |
| topic |
laser spectroscopy cavity-enhanced absorption spectroscopy resonant cavity polarized light Chemical technology TP1-1185 |
| spellingShingle |
laser spectroscopy cavity-enhanced absorption spectroscopy resonant cavity polarized light Chemical technology TP1-1185 Shiyu Guan Dingbo Chen Huilin Cao Zhongqi Tan Study of a Mode Separation Due to Polarization Existing in a Cavity-Enhanced Absorption Spectroscopy |
| description |
A special phenomenon of resonance mode separation is observed during the study of a high sensitivity folded-cavity enhanced absorption spectroscopy for the measurement of trace gases. The phenomenon affects the measurement of gas absorption spectrum in the cavity. This resonant mode separation phenomenon of the resonant cavity is different from the resonant modes previously observed in linear-cavity enhanced absorption spectroscopy systems. To explore the mechanism of this phenomenon, a series of hypotheses are proposed. The most likely reason among these hypotheses is based on the different reflectance properties of the plane mirror at the fold of the cavity for S-polarized light and P-polarized light. Based on the matrix calculation method, the different reflectance and phase shift of the plane mirror for S-polarized light and P-polarized light are analyzed theoretically, and the results are in better agreement with the phenomena observed in the experiment. Finally, in order to eliminate the resonant mode separation phenomenon, line polarizers were added. By improving the system, the cavity enhanced absorption spectrum of residual water vapor in the cavity was successfully measured, and a minimum detectable absorption coefficient of <i>α</i><sub>min</sub> = 7.6 × 10<sup>−9</sup> cm<sup>−1</sup> can be obtained in a single laser scan of 10 s. |
| format |
article |
| author |
Shiyu Guan Dingbo Chen Huilin Cao Zhongqi Tan |
| author_facet |
Shiyu Guan Dingbo Chen Huilin Cao Zhongqi Tan |
| author_sort |
Shiyu Guan |
| title |
Study of a Mode Separation Due to Polarization Existing in a Cavity-Enhanced Absorption Spectroscopy |
| title_short |
Study of a Mode Separation Due to Polarization Existing in a Cavity-Enhanced Absorption Spectroscopy |
| title_full |
Study of a Mode Separation Due to Polarization Existing in a Cavity-Enhanced Absorption Spectroscopy |
| title_fullStr |
Study of a Mode Separation Due to Polarization Existing in a Cavity-Enhanced Absorption Spectroscopy |
| title_full_unstemmed |
Study of a Mode Separation Due to Polarization Existing in a Cavity-Enhanced Absorption Spectroscopy |
| title_sort |
study of a mode separation due to polarization existing in a cavity-enhanced absorption spectroscopy |
| publisher |
MDPI AG |
| publishDate |
2021 |
| url |
https://doaj.org/article/dcacfac21db241a6b62475f6e7a57fa8 |
| work_keys_str_mv |
AT shiyuguan studyofamodeseparationduetopolarizationexistinginacavityenhancedabsorptionspectroscopy AT dingbochen studyofamodeseparationduetopolarizationexistinginacavityenhancedabsorptionspectroscopy AT huilincao studyofamodeseparationduetopolarizationexistinginacavityenhancedabsorptionspectroscopy AT zhongqitan studyofamodeseparationduetopolarizationexistinginacavityenhancedabsorptionspectroscopy |
| _version_ |
1718431614683316224 |