Research and Application Progress of Cavity-enhanced Absorption Spectroscopy（Invited）

Fig. 8. The application of CEAS in DCS，using the same continuous-wave laser with phase modulator to produce a double optical comb，coherence time >2 h^［56］

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Fig. 9. VIPA spectral system signals under different conditions^［61］

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Table 1. Comparison of different light sources

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Table 1. Comparison of different light sources

Type of light source

Wavelength

Advantages

Disadvantages

Arc lamps

Vacuum ultraviolet~near infrared

The output is stable in bands far from atomic lines

Low power

Intensity fluctuation，drift

Light source diffusion

Halogen lamps

Near ultraviolet（>350 nm）~near infrared

High efficiency，compact，cheap，long service life

Stable wavelength output requires precise temperature and current control

Super-continuum sources

400~2 500 nm

High power density

Severe optical feedback

Power，frequency fluctuation

Table 2. Detection limits of air pollution detection target gases in previous studies

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Table 2. Detection limits of air pollution detection target gases in previous studies

Target gas	Detection band/nm	Cavity length/m	Detection limit/（ $\times 10^{7} m o l e c u l a r \cdot c m^{- 3}$ ）	References
$N O_{2}$	315~355	1	886	［70］
	410~482	0.94	12	［71］
	620~690	4.5	$3.4 \times 10^{4}$	［73］
	5 238~5 247	0.1	$2.5 \times 10^{9}$	［74］
$N O_{3}$	652~672	1.9	6.2	［72］
	630~680	1.1	0.62	［34］
	640~680	0.5	5.9	［75］
$H O N O$	355~385	0.48	540	［40］
$H O N O$	360~375	1	500	［76］
$C H_{4}$	3 000~3 450	1	$6.2 \times 10^{5}$	［77］
$C H_{4}$	2 330	0.28	$1.1 \times 10^{13}$	［78］

Table 3. Parameters and detection limits of main biomarkers

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Table 3. Parameters and detection limits of main biomarkers

Target gas	Detection wavelength/μm	Detection limit	References
$C H_{3} C H O$	5.79	$8 \times 10^{- 8}$	［98］
$O C {(C H_{3})}_{2}$	0.266	$5 \times 10^{- 8}$	［99］
$N H_{3}$	10.0	$3 \times 10^{- 9}$	［100］
	10.3	$5 \times 10^{- 9}$	［101］
	1.5	$42 \times 10^{- 8}$	［102］
$C O_{2}$	1.6	$3 \times 10^{- 6}$	［104］
$C O_{2}$	4.9	$5 \times 10^{- 7}$	［101］
$C O$	1.6	$9 \times 10^{- 7}$	［103］
$C O$	4.6	$5 \times 10^{- 7}$	［101］
$C_{2} H_{6}$	3.4	$1.2 \times 10^{- 10}$	［105］
$N O$	5.2	$1 \times 10^{- 9}$	［106］

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Xing CHAO, Zhen HU, Ning ZHU. Research and Application Progress of Cavity-enhanced Absorption Spectroscopy（Invited）[J]. Acta Photonica Sinica, 2023, 52(3): 0352102

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