Table 1 Comparison of comb-enabled PAS and photothermal systems

From: Dual-comb optomechanical spectroscopy

Ref.

Method

Sensing type

Gas

λ μm

Simultaneous spectral width cm−1

Resolution cm−1

P mW

t s

NEC ppb

NNEA cm−1·W·Hz−1/2

16

FTS

Cantilever-enhanced

CH4

~3.3

~200

0.03

48

200

800

8 × 10−10

17

FTS

Cantilever-enhanced

CH4

~3.3

~200

0.02

95

/

83

/

19

Dual-comb

Microphone

C2H2

1.53

~1

0.03

20

1000

10000

/

20

Dual-comb

Quartz-enhanced

C2H2

1.53

2

0.03

270

100

8.3

7 × 10−10

21

Dual-comb

Photothermal

C2H2

1.53

~2

0.017

15

1000

8700

/

This work

Dual-comb

Optomechanically enhanced

C2H2

1.53

1

0.015

150

100

1.1

1.71 × 10−11

  1. FTS Fourier-transform spectroscopy, λ wavelength, P Total excitation power, t Integration time, NEC Noise-equivalent concentration, NNEA Normalized noise-equivalent absorption coefficient.
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