Sulfur Dioxide Detection (SO2)

Application areas of laser-based sulfur dioxide detection

nanoplus lasers for sulfur dioxide detection are used for various applications including:

  • Safety: Emission control

Tunable diode laser spectroscopy allows measuring SO2 with up to ppb precision in real time and in situ. Providing long-term stability and requiring little maintenance, nanoplus lasers are suitable for operation in harsh environments.

Standard wavelengths for sulfur dioxide detection

nanoplus offers various wavelengths to target the vibrational-rotational bands of sulfur dioxide. Literature recommends the following wavelengths for sulfur dioxide detection:

Select your wavelength for sulfur dioxide detection

Above wavelengths as well as further customized wavelengths for sulfur dioxide detection are available from nanoplus.

When you choose your wavelength, you have to consider your product set up, environment and nature of the measurement.

These factors influence the optimum wavelength for your application. Do have a look at the Hitran Database to further evaluate your choice of wavelengths. Our application experts are equally happy to discuss with you the most suitable wavelength for your application.

Let us know the wavelength you require with an accuracy of 0.1 nm!

Figure 1: Absorption features of sulfur dioxide in the 0.76 µm to 6.0 µm range
Absorption features of sulfur dioxide in 760 nm to 6000 nm range

Related information for laser-based sulfur dioxide detection

Specifications & Mountings


Papers & Links

The following tables analyse the typical specifications of the standard wavelengths for SO2 detection.

electro-optical properties of
2460.0 nm DFB laser diode
standard wavelengthλnm2460.0
absorption line strengthScm / mol∼ 4 x 10-24
output powerpoutmW3
threshold currentlthmA253050
current tuning coefficientcTnm / mA0.010.020.05
temperature tuning coefficientcInm / K0.180.220.25
mode hop free tuning rangeΔλnm+/- 0.5
electro-optical properties of
4020.0 nm DFB interband cascade laser
standard wavelengthλnm4020.0
absorption line strengthScm / mol∼ 1 x 10-21
output powerpoutmW> 3
threshold currentlthmA304060
current tuning coefficientcTnm / mA0.12
temperature tuning coefficientcInm / K0.45
mode hop free tuning rangeΔλnm+/- 0.5
mounting options /
technical drawings
wavelengthTECcap with windowAR cap with AR windowfiberheatsinkcollimation
TO5.6 760 nm - 3000 nmNANANANANA
TO5 760 nm - 3000 nmNANA
TO663000 nm - 6000 nmNANA
c-mount 760 nm - 3000 nmNANANANANANA
SM-BTF760 nm - 2360 nmNANAsingle modeNANA
PM-BTF1064 nm - 2050 nmNANApolarization maintainingNANA

Ask for further packages.

Please find below a number of application samples.

Control of toxic substances: SO2
SO2 is a highly reactive and toxic gas which leads to severe respiratory disorders, hence its emissions have to be controlled.

Emission control of flue gases: SO2
SO2 causes acid rain when it reacts with nitrogen oxide. It is generated during fuel combustion at power plants and other industrial facilities. For this reason SO2 emissions are restricted and need to be monitored. [67]

Please find below a selection of related papers from our literature list.

Let us know if you published a paper with our lasers. We will be happy to include it in our literature list.

#9 DFB Lasers Between 760 nm and 16 µm for Sensing Applications;
W. Zeller, L. Naehle, P. Fuchs, F. Gerschuetz, L. Hildebrandt, J. Koeth, Sensors 2010, 10, pp. 2492-2510.

#67 New Opportunities in Mid-Infrared Emission Control;
P. Geiser, Sensors, 2015, pp. 22724-22736.

#75 Interband cascade laser sources in the mid-infrared for green photonics;
J. Koeth, M. von Edlinger, J. Scheuermann, S. Becker, L. Nähle, M. Fischer, R. Weih, M. Kamp, S. Höfling, Proc. SPIE 9767, Novel In-Plane Semiconductor Lasers XV, 976712, March 10, 2016.

#87 Optical‑feedback cavity‑enhanced absorption spectroscopy with an interband cascade laser: application to SO2 trace analysis;
L. Richard, I. Ventrillard, G. Chau, K. Jaulin, E. Kerstel, D. Romanini, Appl. Phys. B, 2016, 122:247.

#100 Multiheterodyne spectroscopy using interband cascade lasers;
L. A. Sterczewski, J. Westberg, C. L. Patrick, C. S. Kim, M. Kim, C. L. Canedy, W. W. Bewley, C. D. Merritt, I. Vurgaftman, J. R. Meyer and G. Wysocki, Opt. Eng. 57(1), 011014, Jan. 2018.

#101 Single-mode interband cascade laser multiemitter structure for two-wavelength absorption spectroscopy; J. Scheuermann, R. Weih, S. Becker, M. Fischer, J. Koeth, S. Höfling, Opt. Eng. 57(1), 011008, Sept. 2017

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