Towards Supercontinuum Cavity Ring-Down Spectroscopy

Stelmaszczyk, K.; Fechner, Martin; Rohwetter, Philipp; Queißer, Manuel; Czyżewski, Adam; Stacewicz, T.; Wöste, L.

doi:10.1007/s00340-008-3320-z

Cited by 32 publications

(30 citation statements)

References 24 publications

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“…hand, a nonlinear method is represented by spontaneous Raman scattering. Some progress of analysis with other nonlinear effects is recently observed, especially by using femtosecond lasers [45,46]. But these methods are still under development.…”

Section: Detection Of Explosive Devicesmentioning

confidence: 99%

Towards optoelectronic detection of explosives

Wojtas

Stacewicz

Bielecki

et al. 2013

Opto-Electronics Review

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Detection of explosives is an important challenge for contemporary science and technology of security systems. We present an application of NOx sensors equipped with concentrator in searching of explosives. The sensors using CRDS with blue — violet diode lasers (410 nm) as well as with QCL lasers (5.26 μm and 4.53 μm) are described. The detection method is based either on reaction of the sensors to the nitrogen oxides emitted by explosives or to NOx produced during thermal decomposition of explosive vapours. For TNT, PETN, RDX, and HMX the detection limit better than 1 ng has been achieved.

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Section: Detection Of Explosive Devicesmentioning

confidence: 99%

Towards optoelectronic detection of explosives

Wojtas

Stacewicz

Bielecki

et al. 2013

Opto-Electronics Review

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“…First labsetups of fully optoelectronic sensor of NO 2 using CRDS methods have been demonstrated already [9][10][11][12][13][14][15]. Various light sources are applied for this purpose: blue -violet LED's or diode lasers or even the broadband superconti− nuum sources [16][17][18]. For laboratory systems, the sensiti− vities reaching 100 ppt were reported [17][18][19][20].…”

Section: No 2 Sensormentioning

confidence: 99%

“…Various light sources are applied for this purpose: blue -violet LED's or diode lasers or even the broadband superconti− nuum sources [16][17][18]. For laboratory systems, the sensiti− vities reaching 100 ppt were reported [17][18][19][20].…”

Section: No 2 Sensormentioning

confidence: 99%

Cavity ring down spectroscopy: detection of trace amounts of substance

Stacewicz

Wojtas

Bielecki

et al. 2012

Opto-Electronics Review

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We describe several applications of cavity ring-down spectroscopy (CRDS) for trace matter detection. NO2 sensor was constructed in our team using this technique and blue-violet lasers (395–440 nm). Its sensitivity is better than single ppb. CRDS at 627 nm was used for detection of NO3. Successful monitoring of N2O in air requires high precision mid-infrared spectroscopy. These sensors might be used for atmospheric purity monitoring as well as for explosives detection. Here, the spectroscopy on sharp vibronic molecular resonances is performed. Therefore the single mode lasers which can be tuned to selected molecular lines are used. Similarly, the spectroscopy at 936 nm was used for sensitive water vapour detection. The opportunity of construction of H2O sensor reaching the sensitivity about 10 ppb is also discussed.

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“…However, active locking and stabilisation of the frequency components make these techniques complex to implement in practical sensing environments. More recently, supercontinuum CRDS has been realised without active matching of the longitudinal modes of the light source and the cavity [27][28][29]. Compared to the mode matched approach, the trade-off is a decreased optical throughput.…”

Section: Introductionmentioning

confidence: 99%

“…In that work a spectrometer and photon counting system were used to determine the ring-down times as a function of wavelength at 1 nm resolution. Stelmaszczyk et al demonstrated broadband CRDS with supercontinuum radiation generated by filaments [28,29]. They used an ICCD camera and a spectrometer featuring a resolution of 0.01-0.25 nm for the detection of NO 2 [29].…”

Section: Introductionmentioning

confidence: 99%