High performance continuous-wave laser cavity enhanced polarimetry using RF-induced linewidth broadening
We present precise optical rotation measurements of gaseous chiral samples using near-IR continuous-wave cavity-enhanced polarimetry. Optical rotation is determined by comparing cavity ring-down signals for two counter-propagating beams of orthogonal polarisation which are subject to polarisation ro...
| Main Authors: | , , , , |
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| Formato: | Journal article |
| Idioma: | English |
| Publicado em: |
Optica Publishing Group
2021
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| _version_ | 1826260641784004608 |
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| author | Tran, D-B-A Peverall, R Rosson, S Manfred, KM Ritchie, GAD |
| author_facet | Tran, D-B-A Peverall, R Rosson, S Manfred, KM Ritchie, GAD |
| author_sort | Tran, D-B-A |
| collection | OXFORD |
| description | We present precise optical rotation measurements of gaseous chiral samples using near-IR continuous-wave cavity-enhanced polarimetry. Optical rotation is determined by comparing cavity ring-down signals for two counter-propagating beams of orthogonal polarisation which are subject to polarisation rotation by the presence of both an optically active sample and a magneto-optic crystal. A broadband RF noise source applied to the laser drive current is used to tune the laser linewidth and optimise the polarimeter, and this noise-induced laser linewidth is quantified using self-heterodyne beat-note detection. We demonstrate the optical rotation measurement of gas phase samples of enantiomers of α-pinene and limonene with an optimum detection precision of 10 µdeg per cavity pass and an uncertainty in the specific rotation of ∼0.1 deg dm−1 (g/ml)−1 and determine the specific rotation parameters at 730 nm, for (+)- and (−)-α-pinene to be 32.10 ± 0.13 and −32.21 ± 0.11 deg dm−1 (g/ml)−1, respectively. Measurements of both a pure R-(+)-limonene sample and a non-racemic mixture of limonene of unknown enantiomeric excess are also presented, illustrating the utility of the technique. |
| first_indexed | 2024-03-06T19:08:50Z |
| format | Journal article |
| id | oxford-uuid:1615bb7c-3124-486f-aa83-8ba00ac0cfa1 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T19:08:50Z |
| publishDate | 2021 |
| publisher | Optica Publishing Group |
| record_format | dspace |
| spelling | oxford-uuid:1615bb7c-3124-486f-aa83-8ba00ac0cfa12022-03-26T10:29:18ZHigh performance continuous-wave laser cavity enhanced polarimetry using RF-induced linewidth broadeningJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:1615bb7c-3124-486f-aa83-8ba00ac0cfa1EnglishSymplectic ElementsOptica Publishing Group2021Tran, D-B-APeverall, RRosson, SManfred, KMRitchie, GADWe present precise optical rotation measurements of gaseous chiral samples using near-IR continuous-wave cavity-enhanced polarimetry. Optical rotation is determined by comparing cavity ring-down signals for two counter-propagating beams of orthogonal polarisation which are subject to polarisation rotation by the presence of both an optically active sample and a magneto-optic crystal. A broadband RF noise source applied to the laser drive current is used to tune the laser linewidth and optimise the polarimeter, and this noise-induced laser linewidth is quantified using self-heterodyne beat-note detection. We demonstrate the optical rotation measurement of gas phase samples of enantiomers of α-pinene and limonene with an optimum detection precision of 10 µdeg per cavity pass and an uncertainty in the specific rotation of ∼0.1 deg dm−1 (g/ml)−1 and determine the specific rotation parameters at 730 nm, for (+)- and (−)-α-pinene to be 32.10 ± 0.13 and −32.21 ± 0.11 deg dm−1 (g/ml)−1, respectively. Measurements of both a pure R-(+)-limonene sample and a non-racemic mixture of limonene of unknown enantiomeric excess are also presented, illustrating the utility of the technique. |
| spellingShingle | Tran, D-B-A Peverall, R Rosson, S Manfred, KM Ritchie, GAD High performance continuous-wave laser cavity enhanced polarimetry using RF-induced linewidth broadening |
| title | High performance continuous-wave laser cavity enhanced polarimetry using RF-induced linewidth broadening |
| title_full | High performance continuous-wave laser cavity enhanced polarimetry using RF-induced linewidth broadening |
| title_fullStr | High performance continuous-wave laser cavity enhanced polarimetry using RF-induced linewidth broadening |
| title_full_unstemmed | High performance continuous-wave laser cavity enhanced polarimetry using RF-induced linewidth broadening |
| title_short | High performance continuous-wave laser cavity enhanced polarimetry using RF-induced linewidth broadening |
| title_sort | high performance continuous wave laser cavity enhanced polarimetry using rf induced linewidth broadening |
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