Spectral Dynomics of Multi-Mode Dye Lasers and Single-Atom Absorption

Sierks, J.; Latz, T.; Baev, V. M.; Toschek, P. E.

doi:10.1109/eqec.1996.561680

Cited by 8 publications

(2 citation statements)

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“…Many optical sensing technologies were developed to improve the detection sensitivity, such as differential absorption spectroscopy, Fourier transform infrared (FTIR) spectroscopy, tunable diode laser absorption spectroscopy (TDLAS), differential absorption Raman scatting laser radar, laser-induced fluorescence spectroscopy, and laser photoacoustic spectroscopy. Since V. M. Baev et al successfully achieved intra-cavity gas detection with semiconductor lasers as the light source in 1992, [1] intra-cavity absorption gas sensor (ICAGS) has drawn researchers' attention in recent years, because of gas detection sensitivity can be dramatically enhanced by inserting a gas cell into the laser cavity [2] In 2004, Y. Zhang et al reported their theoretical and experimental analysis of acetylene gas sensor based on a liner cavity EDF laser，and obtained a sensitivity enhancement of ~110. [3,4,5] Then Min Zhang et al proposed an ICAGS using wavelength modulation and wavelength sweep technique, which significantly improved the system performance.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Dual-Wavelength Erbium-Doped Fiber Laser Intra-Cavity Absorption Sensor

Lü

Huang

et al. 2013

AMR

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Section: Introductionmentioning

confidence: 99%

Investigation of Dual-Wavelength Erbium-Doped Fiber Laser Intra-Cavity Absorption Sensor

Lü

Huang

et al. 2013

AMR

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“…2,3 The highest optical path reported was 70 000 km, established with a CW dye laser. 4 Since its conception, 5 ICLAS has been demonstrated using gain media that include Ti:sapphire laser, 2 dye lasers, 6 color center lasers, 7 Nd 3þ glass lasers, 8 diode lasers, 9 doped fiber lasers, 10 and other solid state lasers. Previous demonstrations have been in the ultraviolet to near infrared wavelength range and in the THz.…”

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confidence: 99%

Quantum cascade laser intracavity absorption spectrometer for trace gas sensing

Muraviev¹,

Maukonen²,

Fredricksen³

et al. 2013

Applied Physics Letters

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A mid-infrared intracavity laser absorption spectrometer for trace gas sensing is demonstrated. An external-cavity multi-mode quantum cascade laser with central wavelength 8.0 μm was combined with a scanning Fabry-Perot interferometer, which analyzed the change of the laser emission spectrum caused by introducing an analyte inside the cavity. The detection mechanism is based on monitoring the laser spectrum dynamics at adiabatically changing laser conditions in long pulse operation mode. Fast acquisition and vapor exchange allow nearly real-time analyte detection. Sensitivity at the level of 1 × 10−5 cm−1 was demonstrated based on a weak water vapor absorption line.

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Intracavity absorption spectroscopy of formaldehyde from 6230 to 6420 cm−1

Fjodorow

Hellmig²,

Baev³

et al. 2017

Appl. Phys. B

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In combustion processes, during ignition, part of the fuel is converted to CH 2 O before substantial heat release. The complex chemical interaction of CH 2 O with oxidizer, fuel, and other intermediates determines the ignition delay time, i.e., the time between bringing the fuel/ oxidizer mixture into ignition conditions (usually by compression) and its conversion into combustion products. Fundamental understanding of the chemical and physical processes responsible for ignition is essential for efficient and safe operation of combustion equipment. Usually, experimental studies of ignition processes are performed by measuring ignition delay times. However, the amount of detailed information derived from ignition delay times is very limited, and consequently, time-resolved studies of the ignition process are required for understanding the underlying physical/chemical processes. The comparison of measured temporal profiles of intermediate species (e.g., CH 2 O) with those calculated using detailed combustion mechanisms, is capable of providing insights into ignition processes and to verify and/or improve theoretical models. Laser-diagnostic techniques with high sensitivity and high sampling rates are required for this purpose. Although laser diagnostics of CH 2 O in combustion environments are relatively well established, none of the techniques usually applied is capable of fully satisfying the requirements posed by the harsh environment, the low species concentration, and the fast reaction rates.One of the most established laser-based methods for measuring CH 2 O in combustion environments is laserinduced fluorescence (LIF). It provides high sensitivity, together with high temporal and spatial resolution. LIF was successfully implemented for combustion diagnostics of CH 2 O in laminar and turbulent flames, flow reactors, and engines [1][2][3]. Unfortunately, this method is difficult to apply for quantitative diagnostics because of substantial Abstract We apply intracavity absorption spectroscopy for measurements of the absorption spectrum of formaldehyde, CH 2 O, from 6230 to 6420 cm −1 , of which only a small fraction (6351-6362 cm −1 ) has been recorded elsewhere. The measurements are performed in the cavity of a broadband Er 3+ -doped fiber laser, with a sensitivity corresponding to the effective absorption path length of 45 m and a spectral resolution of 0.1 cm −1 . The noise-equivalent detection limit of CH 2 O achieved with the strongest absorption line at 6252.64 cm −1 is estimated to be 5 ppm. High tolerance to broadband losses and the accessible time resolution of 50 µs make it possible to apply this detection system for time-resolved monitoring of CH 2 O together with other molecules in harsh combustion environments, e.g., in combustion engines.

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Spectral Dynomics of Multi-Mode Dye Lasers and Single-Atom Absorption

Cited by 8 publications

References 1 publication

Investigation of Dual-Wavelength Erbium-Doped Fiber Laser Intra-Cavity Absorption Sensor

Investigation of Dual-Wavelength Erbium-Doped Fiber Laser Intra-Cavity Absorption Sensor

Quantum cascade laser intracavity absorption spectrometer for trace gas sensing

Intracavity absorption spectroscopy of formaldehyde from 6230 to 6420 cm−1

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