Fiber loop cavity ringdown spectroscopy device based on Brillouin slow light effect

A technology of ring-down spectroscopy and ring cavity, which is applied in the field of optical fiber ring-cavity ring-down spectroscopy devices, can solve the problems of increasing the effective length of interaction between light and matter, and achieve the effect of improving measurement sensitivity

Active Publication Date: 2013-10-02
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology

The application of the slow light effect in the field of sensing has attracted people's attention. However, in all current cavity ring-down spectroscopy techniques, the slow light effect is used to increase the effective length of the interaction between light and matter, and is not based on the Bury slow light effect

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  • Fiber loop cavity ringdown spectroscopy device based on Brillouin slow light effect
  • Fiber loop cavity ringdown spectroscopy device based on Brillouin slow light effect
  • Fiber loop cavity ringdown spectroscopy device based on Brillouin slow light effect

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Embodiment Construction

[0026] like figure 1 As shown, the present invention is realized in this way, and it includes tunable narrow-linewidth pump laser 1, photodetector 2, optical circulator I3, optical coupler I4, optical coupler II5, optical isolator 6, optical modulation 7, tunable detection laser 8, optical fiber ring cavity 9, optical circulator Ⅱ 10, optical sensor head 11 and optical circulator Ⅲ 12. The optical circulator I3 is connected to the optical coupler I4, the optical coupler II5, the optical isolator 6, the optical modulator 7 and the tunable detection laser 8 are connected in series in sequence, the optical circulator II10, the optical circulator III12, the optical coupler Optical circulator II5 and optical coupler I1 are sequentially connected to the optical fiber ring cavity 9 in the clockwise direction, and the optical sensor head 11 is connected to the optical circulator II10 and optical circulator III12; the optical circulator I3 transmits in the counterclockwise direction; t...

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Abstract

The invention discloses a fiber loop cavity ringdown spectroscopy device based on the Brillouin slow light effect. The fiber loop cavity ringdown spectroscopy device has the structural characteristics that a tunable narrow linewidth pumping laser device and a photoelectric detector are connected with an optical circulator I; the optical circulator I is connected with an optical coupler I; an optical coupler II, an optical isolator, an optical modulator and a tunable detection laser device are sequentially connected in series; an optical circulator II, an optical circulator III, an optical coupler II and an optical coupler I are clockwise sequentially connected with a fiber loop cavity; and an optical sensing head is connected with the optical circulator II and the optical circulator III. According to the device disclosed by the invention, by adopting the Brillouin slow light effect, the system introduces the pumping light in a direction opposite to the detection light, and adjusts the frequency of the pumping light and the detection light so as to generate stimulated Brillouin scattering. The stimulated Brillouin scattering enables the detection light to generate a slow light effect, thus the propagation speed of the detection light in the fiber loop cavity is reduced, and the measurement sensitivity of the fiber loop cavity ringdown spectroscopy technology is greatly improved.

Description

technical field [0001] The invention relates to an optical fiber ring cavity ring-down spectrum device based on the Brillouin slow light effect. Background technique [0002] As one of the spectral testing technologies, optical fiber ring cavity ring-down spectroscopy has attracted widespread attention due to its high sensitivity, unaffected by fluctuations in the light intensity of the light source, and strong anti-interference ability. One of the main technical means of [0003] In optical fiber ring cavity ring-down spectroscopy, the ring-down time constant of the fiber ring cavity is [0004] τ 0 = L V ( - ln T + α f L ) - - - ( ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01J3/42
Inventor 万生鹏何兴道
Owner NANCHANG HANGKONG UNIVERSITY
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