Hydrogen Chloride Detection (HCl)

Application areas of laser-based hydrogen chloride detection

nanoplus lasers for hydrogen chloride detection are used for various applications including various applications including:

  • Safety: Emission control
  • Safety: Chemical process monitoring

Tunable diode laser spectroscopy allows measuring HCl 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 hydrogen chloride detection

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

Select your wavelength for hydrogen chloride detection

Above wavelengths as well as further customized wavelengths for hydrogen chloride 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 hydrogen chloride in the 0.76 µm to 6.0 µm range
Absorption features of hydrogen chloride in 760 nm to 6000 nm range

Related information for laser-based hydrogen chloride detection

Specifications & Mountings


Papers & Links

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

electro-optical properties of
1742.0 nm DFB laser diode
standard wavelengthλnm1742.0
absorption line strengthScm / mol∼ 1 x 10-20
output powerpoutmW5
threshold currentlthmA102530
current tuning coefficientcTnm / mA0.0080.020.03
temperature tuning coefficientcInm / K0.070.10.14
mode hop free tuning rangeΔλnm+/- 0.5
electro-optical properties of
3395.0 nm DFB interband cascade laser
standard wavelengthλnm3395.0
absorption line strengthScm / mol∼ 5 x 10-19
output powerpoutmW> 5
threshold currentlthmA203050
current tuning coefficientcTnm / mA0.10
temperature tuning coefficientcInm / K0.35
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.

Search for Exoplanets:
The search for life on planets in our galaxy claims highest requirements on the instruments used [39]. DFB lasers are used e.g. in the calibration module for SPHERE [66].

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.

#3 Gas monitoring in the process industry using diode laser spectroscopy;
I. Linnerud, P.Kaspersen, T. Jaeger, Appl. Phys. B 67, 1998, pp. 297-305.

#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.

#136 Interband cascade laser absorption of hydrogen chloride for high-temperature thermochemical analysis of fire-resistant polymer reactivity;
D. I. Pineda, J. L. Urban, R. M. Spearrin, Appl. Opt., Vol. 59, No. 7, 2020, pp. 2141-2148.

#145 Accurate analysis of HCl in biomethane using laser absorption spectroscopy and ion-exchange chromatography;
J. A. Nwaboh, H. Meuzelaar, J. Liu, S. Persijn, J. Li, A. M. H. van der Veen, N. Chatellier, A. Papin, Z. Qu, O. Werhahna, V. Eberta, Analyst, Iss. 4, 2021.

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