Phase shift cavity ring down absorption spectroscopy

Engeln, Rah Richard; Helden, Gert von; Berden, Giel; Meijer, Gerard

doi:10.1016/0009-2614(96)01048-2

Cited by 177 publications

(124 citation statements)

References 18 publications

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“…In terms of practical optical configurations, our group along with many others has used incoherent light sources coupled with an off-confocal placement of cavity mirrors (in order to achieve near-continuum transmission of the broadband input light [40]). An alternative to this is the off axis-integrated cavity output spectroscopy (OA-ICOS) where the light, often from a cw laser, is injected in an offaxis manner to the cavity mirror in order to relax the stringent stability requirement for cavity distance or laser frequency [32].…”

Section: Discussionmentioning

confidence: 99%

Understanding the sensitivity of cavity-enhanced absorption spectroscopy: pathlength enhancement versus noise suppression

Ouyang

Jones

2012

Appl. Phys. B

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Cavity-enhanced absorption spectroscopy is now widely used as an ultrasensitive technique in observing weak spectroscopic absorptions. Photons inside the cavity are reflected back and forth between the mirrors with reflectivities R close to one and thus (on average) exploit an absorption pathlength L that is 1/(1 -R) longer than a single pass measurement. As suggested by the Beer-Lambert law, this increase in L results in enhanced absorbance A (given by aL with a being the absorption coefficient) which in turn favours the detection of weak absorptions. At the same time, however, only (1 -R) of the incident light can enter the cavity [assuming that mirror transmission T is equal to (1 -R)], so that the reduction in transmitted light intensity DI caused by molecular absorption equates to that would be obtained if in fact no cavity were present. The enhancement in A = DI/I, where

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Section: Discussionmentioning

confidence: 99%

Understanding the sensitivity of cavity-enhanced absorption spectroscopy: pathlength enhancement versus noise suppression

Ouyang

Jones

2012

Appl. Phys. B

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“…͑16͒, nϷx/2L Ϫ( / )(x/2L ) 2 and dx/dnϭ2L ϩ4L n. The transmitted intensity then follows the spatial profile in the form of…”

Section: Dependence On the Mirror Wedge Anglementioning

confidence: 99%

“…1 During the last decade there have been widespread CRD applications, and a number of novel variations have emerged for advanced implementations. [2][3][4][5][6][7][8][9][10][11] Among them is the realization of the CRD technique in ''spatial'' domain rather than in ''time'' domain, 12 which features a new optical arrangement using a plane Fabry-Perot ͑PFP͒ cavity in combination with a narrow, collimated cw laser beam in oblique incidence as Fig. 1 illustrates.…”

Section: Introductionmentioning

confidence: 99%

Spatial-domain cavity ringdown from a high-finesse plane Fabry–Perot cavity

Lee

Kim

Yoo

et al. 2002

Journal of Applied Physics

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We investigate the optical transmission of a tilted plane Fabry-Perot cavity leading to spatial cavity ringdown, the exponentially decaying intensity output present along the transverse spatial coordinate. Primary features of the spatial cavity ringdown are theoretically predicted from the spectral and spatial cavity transfer function which is derived analytically on the combined basis of ray optics and diffraction theory applied to an ideal diffraction lossless cavity of one transverse dimension. Spatial frequency filtration by a narrow Lorentzian-shaped cavity resonance is shown to play key roles on the spatial aspects of transmitted beam profiles. Our theoretical formulation is further extended to the case of wedged plane Fabry-Perot cavities. The experimental observation of spatial cavity ringdown signals exhibits an excellent agreement with the theoretical prediction.

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“…The coupling of the narrow-band light into the cavity can be done via locking the laser to the cavity, or, more straightforward, by using the accidental coincidences of the frequency of the modes of the ͑unstabilized͒ ring down cavity with the laser frequency. 15,16 In all the CRD experiments reported to date polarized laser radiation has been used for absorption measurements. By putting a polarization selective optical element in front of the detector, it should in principle be possible to measure the optical rotation of the plane of polarization of the incoming beam upon passage through the ring down cavity.…”

Section: Introductionmentioning

confidence: 99%

Polarization dependent cavity ring down spectroscopy

Engeln

Berden

Berg

et al. 1997

The Journal of Chemical Physics

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We here theoretically outline and experimentally demonstrate that polarization spectroscopy can be combined with cavity ring down ͑CRD͒ spectroscopy, thereby retaining the specific advantages of both techniques. The b 1 ⌺ g ϩ (vЈϭ2)←X 3 ⌺ g Ϫ (vЉϭ0) transition of molecular oxygen around 628 nm is used to demonstrate the possibility to selectively measure either the polarization-dependent absorption or the resonant magneto-optical rotation of gas-phase molecules in the appropriate setup. Just as in CRD absorption spectroscopy, where the rate of absorption is measured, in the here presented polarization-dependent CRD ͑PDCRD͒ detection scheme the rate of polarization rotation is measured, which enables the polarization rotation to be quantitatively determined. Apart from studying electro-optic and magneto-optic phenomena on gas-phase species, the PDCRD detection scheme is demonstrated to be applicable to the study of magneto-optical rotation in transparent solid samples as well.

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Phase shift cavity ring down absorption spectroscopy

Cited by 177 publications

References 18 publications

Understanding the sensitivity of cavity-enhanced absorption spectroscopy: pathlength enhancement versus noise suppression

Understanding the sensitivity of cavity-enhanced absorption spectroscopy: pathlength enhancement versus noise suppression

Spatial-domain cavity ringdown from a high-finesse plane Fabry–Perot cavity

Polarization dependent cavity ring down spectroscopy

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