The study of wavelength modulation off-axis integrated cavity output spectroscopy in the case of Lorentzian absorption profile

Tan, Zhongqi; Long, Xingwu; Feng, Xianwang; Wei, Zhimeng

doi:10.1016/j.optcom.2010.09.072

Cited by 6 publications

(4 citation statements)

References 19 publications

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“…56 DFB, distributed feedback; LDC, laser diode controller; OA-ICOS, off-axis integrated cavity output spectroscopy; PZTD, piezoelectric transducer diver sensitivity of the OA-ICOS system by a factor of 5-20. [56][57][58][59][60][61][62] It should be noted that the enhancement of wavelength modulation is not set in stone in OA-ICOS system. 63 Generally when the cavity mirrors with low reflectivity (<0.998) are used, there is a relatively strong optical intensity in the transmitted signal, and the laser amplitude fluctuations dominate the overall noise level, thus a high sensitivity improvement is attainable in this region.…”

Section: Wavelength Modulation Spectroscopymentioning

confidence: 99%

“…Wavelength modulation can effectively reduce 1/ f noise and other low‐frequency noise, as well as eliminate the annoying baseline slope normally encountered in diode laser absorption spectroscopy. The addition of wavelength modulation has been shown to increase the detection sensitivity of the OA‐ICOS system by a factor of 5–20 56–62 …”

Section: Recent Progresses For Improving Performances Of Oa‐icosmentioning

confidence: 99%

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Recent advances and applications of off‐axis integrated cavity output spectroscopy

Shao

Mei

Chen

et al. 2022

Micro & Optical Tech Letters

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The off-axis integrated cavity output spectroscopy (OA-ICOS) represents a suitable solution in many applications with a simple structure and high sensitivity. The off-axis configuration allows the continuous spectrum output without cavity mode structure when a continuous wave laser is used while preserving the optical resonator's ability to enhance the optical path by tens of thousands of times. This review summarizes the recent advances and applications of OA-ICOS in recent decades. The evolutionary process and basic principle of OA-ICOS are introduced. Various approaches for improving the technical performance and enabling simultaneous multigas measurement are reported. Finally, the various field applications of OA-ICOS technology and the potential development directions are discussed.

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Section: Wavelength Modulation Spectroscopymentioning

confidence: 99%

Section: Recent Progresses For Improving Performances Of Oa‐icosmentioning

confidence: 99%

Recent advances and applications of off‐axis integrated cavity output spectroscopy

Shao

Mei

Chen

et al. 2022

Micro & Optical Tech Letters

View full text Add to dashboard Cite

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“…As shown in Figure 1, In the early days, we used ultra-low expansion coefficient glass-ceramic as the resonant cavity and used the high reflectivity mirrors with a reflectivity of 99.99% as the cavity mirror. Combined with precision optical polishing and optical glue technology, we established a high-stability, low-loss folded-type optical cavity [7][8][9][10] . At the same time, the narrow-spectrum near-infrared DFB laser commonly used in the field of communication is used as the light source.…”

Section: Previous Experimentsmentioning

confidence: 99%

Study on contamination problem in cavity enhanced breath gas diagnosis technology

Tan

Wang

Guan

et al. 2022

Optics in Health Care and Biomedical Optics XII

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Cavity ring-down or cavity enhanced expiratory gas diagnosis is a promising technology direction in medical diagnosis, which is expected to solve the problems of rapid, accurate, non-invasive and low-cost diagnosis of some diseases. The core of these techniques for breath gas diagnosis is to use the optical resonance’s enhancement effect to increase the interaction path between laser and breathing gas, so as to improve the detection sensitivity of breathing mark gas concentration. However, in the clinical application of this kind of technology, breathing gas needs to be filled with an ultra-low loss optical resonator. In this process, the pollution of optical resonator becomes an important bottleneck that affects and restricts the development of this technology. In this paper, different from the traditional way of gas pretreatment, the ideas to solve this problem are discussed and analyzed from the perspectives of pollution discovery, structure optimization, pollution immunity design, etc. Especially, focusing on the spectral ripple effect in the optical feedback cavity enhancement system, the optimization of V-shaped cavity structure and the aerodynamic design of cavity structure, the cavity pollution problem of V-shaped cavity is discussed and analyzed. These works hope to provide some references for accelerating the clinical application of this technology.

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“…Different from CRDS, CEAS measures the intensity of the transmitted light from the cavity by a photodetector, which reduces the response frequency requirement of the system. Many types of CEAS have been proposed, which can be divided into two categories: integrated cavity output spectroscopy (ICOS) [14,15,16] and mode-locking CEAS. In ICOS, the laser frequency is swept through some cavity modes, and the integrated transmission of these cavity modes is measured.…”

Section: Introductionmentioning

confidence: 99%

Long-Term Stable Online Acetylene Detection by a CEAS System with Suppression of Cavity Length Drift

Feng

2019

Sensors

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A trace acetylene (C2H2) detection system was demonstrated using the cavity-enhanced absorption spectroscopy (CEAS) technique and a near-infrared distributed feedback (NIR-DFB) laser. A Fabry–Perot (F–P) cavity with an effective optical path length of 49.7 m was sealed and employed as a gas absorption cell. Co-axis cavity alignment geometry was adopted to acquire a larger transmitted light intensity and a higher sensitivity compared with off-axis geometry. The laser frequency was locked to the cavity fundamental mode (TEM00 mode) by using the Pound–Drever–Hall (PDH) technique continuously. By introducing a cavity length-locking loop, the drift of the cavity length was suppressed, and the stability of the system was enhanced. To demonstrate the efficacy of the system, a C2H2 absorption spectrum near 6534.36 cm−1 was acquired by tuning the laser operation temperature. Measurements of C2H2 samples with different concentrations were carried out, and a good linear relationship between C2H2 concentration and the cavity-transmitted signal voltage was observed. The measurement results showed the system could work stably for more than 2 h without major fluctuations. The Allan variance analysis results demonstrated a detection limit of 9 parts-per-billion (ppb) with an averaging time of 11 s corresponding to a minimum detectable absorption coefficient of 1.1 × 10−8 cm−1.

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The study of wavelength modulation off-axis integrated cavity output spectroscopy in the case of Lorentzian absorption profile

Cited by 6 publications

References 19 publications

Recent advances and applications of off‐axis integrated cavity output spectroscopy

Recent advances and applications of off‐axis integrated cavity output spectroscopy

Study on contamination problem in cavity enhanced breath gas diagnosis technology

Long-Term Stable Online Acetylene Detection by a CEAS System with Suppression of Cavity Length Drift

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