Top Wavelength: 1581.0 nm DFB Laser

DFB laser diodes at 1581.0 nm are used for carbon dioxide detection. Please have a look at the key features, specifications and applications.

Key features of nanoplus DFB laser diodes

  • monomode
  • continuous wave
  • room temperature
  • tunable
  • custom wavelengths

Why choose nanoplus DFB laser diodes

  • stable longitudinal and transversal single mode emission
  • precise selection of target wavelength
  • narrow laser line width
  • mode-hop-free wavelength tunability
  • fast wavelength tuning
  • typically > 5 mW output power
  • small size
  • easy usability
  • high efficiency
  • long-term stability

For more than 15 years nanoplus has been the technology leader for lasers in gas sensing. We produce lasers at large scale at our own fabrication sites in Gerbrunn and Meiningen. nanoplus cooperates with the leading system integrators in the TDLAS based analyzer industry. More than 20,000 installations worldwide prove the reliability of nanoplus lasers.

Quick description of nanoplus DFB laser technology

nanoplus uses a unique and patented technology for DFB laser manufacturing. We apply a lateral metal grating along the ridge waveguide, which is independent of the material system. Read more about our patented distributed feedback technology.

Related information for nanoplus DFB standard laser diodes at 1581.0 nm


Mountings & Accessories


Papers & Links

The following table summarizes the typical DFB laser specifications at 1581.0 nm.

parameters (T = 25 °C)symbolunitminimumtypicalmaximum
wavelength precisionδnm0.1
optical output powerPoutmW5
forward currentIfmA70
threshold currentlthmA102530
current tuning coefficientCInm / mA0.0080.0150.02
temperature tuning coefficientCTnm / K0.070.10.14
typical maximum operating voltageVopV2
side mode suppression ratioSMSRdB> 35
slow axis (FWHM)degrees203040
fast axis (FWHM)degrees405060
emitting areaW x Hµm x µm2.0 x 1.03.0 x 1.55.0 x 2.0
storage temperatureTS°C-40+20+80
operational temperature at caseTC°C-20+25+50

nanoplus DFB lasers show outstanding spectral, tuning and electrical properties. They are demonstrated in figures 1 - 3. Click on the graphics to enlarge.

Figure 1: Spectrum of nanoplus 1581 nm DFB laser diode
Figure 1: Spectrum of nanoplus 1581 nm DFB laser diode
Figure 2: Mode hop free tuning of nanoplus 1581 nm DFB laser diode
Figure 2: Mode hop free tuning of nanoplus 1581 nm DFB laser diode
Figure 3: Typical power, voltage and current characteristics of nanoplus 1581 nm DFB laser diode
Figure 3: Typical power, voltage and current characteristics of nanoplus 1581 nm DFB laser diode

If you are uncertain whether you require a DFB laser, compare the specifications with our Fabry Perot Lasers or contact us.

nanoplus offers a variety of free space and fiber coupled mountings. Configure your laser according to your needs.

Free space mountings

Select a TO header with or without TEC. The TO headers are hermetically sealed with cap and window. Ask for customization without cap or without window. c-mount is available upon request. Please click on the mounting for detailed specifications and dimensions.

TO5 header
with TEC
and thermistor,
black cap and
AR coated window
TO5 header
TO56 header
without TEC
and thermistor,
cap and window
TO56 header
without TEC
and thermistor

Fiber coupled mountings

Choose between SM and PM fiber coupling. Please click on the mounting for detailed specifications and dimensions. The SM-BTF is available for lasers between 760 nm and 2360 nm, the PM-BTF option is offered for lasers between 1064 nm and 2050 nm.

butterfly package with single mode fiber, TEC and thermistor,
FC / APC connector
butterfly package with single mode fiber
butterfly package with polarization maintaining fiber, TEC and thermistor,
FC / APC connector
butterfly package with polarization maintaining fiber


TO5 heatsink
TO5 heatsink

The nanoplus TO5 heatsink facilitates your laser set up by:

  • improved heat distribution
  • connectors for laser diode driver
  • connectors for temperature controller
  • M6 thread for optical posts
  • easy use with standard cage systems
TO5 heatsink with collimation
TO5 heatsink with collimation

The nanoplus TO5 heatsink is available with collimation. The optical set up guarantees a collimated elliptical beam shape.


nanoplus compact collimation module with heatsink and lens
nanoplus compact collimation module with heatsink and lens

The nanoplus compact collimation module offers:

  • collimated beam
  • specified beam direction
  • identical reference and heat sink plane
  • TEC + thermistor
  • hermetically sealed laser housing

Please find below a number of application samples.

Combustion control in high temperature processes: CO2 and CH4
Continuous monitoring of contents like CO2 or CH4 concentrations is essential for the efficiency of high-temperature processes in e. g. incinerators, furnaces or petrochemical refineries. Managing the CO2 content in combustion processes simultaneously reduces greenhouse gas emissions. This is also relevant for energy generating industries like coal burning power plants. [12, 35, 40, 45, 62, 94, 96, 112, 113, 116]

Quality control in natural gas pipelines: CO2
CO2 is a natural diluent in oil and gas deposits. When it reacts with H2S and H2O steel pipelines corrode. Real-time monitoring of CO2 at natural gas custody transfer points is necessary to avoid contaminated gas from flowing downstream. Immediate measures may be taken to purify the natural gas. [116]

Emission control of greenhouse gases: CO2
Environmental policies have been implemented worldwide to reduce greenhouse gas emissions. According to the United States Environmental Protection Agency, human activities account for more than three quarters of CO2 emissions. They are mainly due to the combustion of fossil fuels for energy generation, transportation and industry. Remote sensing technologies have been introduced to quantify CO2 and CO emissions in atmosphere. [93, 106, 116]

Monitoring of breath gas: CO2
Helicobacter pylori bacteria cause stomach ulcer. Breath analysis diagnoses such an infection in a non-invasive way replacing disagreeable gastroscopies. It uses the CO2 concentration in exhaled breath as a biomarker. [9,88, 116]

Emission control of exhaust fumes: CO2 and NOx
Guided by environmental policies, the automobile industry is concerned to reduce the carbon footprint of vehicles. Automotive suppliers develop innovative combustion engines to control CO2 and NOx concentration in exhaust fumes. [116]

Emission control of exhaust fumes: CO2
Remote sensing technologies identify unclean vehicles on the road. They help to control traffic-generated carbon dioxide emissions. [116]

Isotope detection by NASA Mars Rover Curiosity: CO2 and H2O
NASA’s flagship Rover Curiosity detects CO2 and H2O isotopes based on their tunable laser spectrometer SAM. The analysis of soil samples is to determine whether Mars is or has been a suitable living environment. We are proud that the instrument uses a 2.78 µm nanoplus laser for this measurement. [25, 116]

Surveillance of volcanic activities: CO2
Early warning systems for volcanic eruptions continuously monitor CO2 by TDLS, as it is an abundant volcanic gas. [116]

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.

#4 Laser-Based Analyzers – Shining New Stars;
P. Nesdore, Gases & Instrumentation, March/April 2011, pp. 30-33.

#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.

#12 CO2 concentration and temperature sensor for combustion gases using diode-laser absorption near 2.7 µm;
A. Farooq,  J.B. Jeffries, R.K. Hanson, Appl. Phys. B 90, 2008, pp. 619-628.

#16 Diode laser measurements of linestrength and temperature-dependent lineshape parameters of H2O-, CO2-, and N2-perturbed H2O transitions near 2474 and 2482 nm;
C.S. Goldenstein, J.B. Jeffries, R.K. Hanson, J. of Quantitative Spectr. & Radiative Transfer 130, 2013, pp. 100–111.

#19 Measurements of Mars Methane at Gale Crater by the SAM Tunable Laser Spectrometer on the Curiosity Rover;
C.R. Webster, P.R. Mahaffy, S.K. Atreya, G.J. Flesch, K.A. Farley, 44th Lunar and Planetary Science Conference, March 18-22, 2013, LPI Contribution No. 1719, p.1366.

#25 Isotope Ratios of H, C, and O in CO2 and H2O of the Martian Atmosphere;
C.R. Webster, P.R. Mahaffy, G.J. Flesch, P.B. Niles, J. Jones, L.A. Leshin, S.K. Atreya, J.C. Stern, L.E. Christensen, T. Owen, H. Franz, R.O. Pepin, A. Steele, Science, 341, 6143, 2013, pp. 260-263.

#35 TDLAS-based sensors for in situ measurement of syngas composition in a pressurized, oxygen-blown, entrained flow coal gasifier;
R. Sur, K. Sun, J.B. Jeffries, R.K. Hanson, R.J. Pummill, T. Waind, D.R. Wagner, K.J. Whitty, Appl. Phys. B, 116, 1, 2014, pp. 33-42.

#38 Monolithic widely tunable laser diodes for gas sensing at 2100 nm;
N. Koslowski, A. Heger, K. Roesner, M. Legge, L. Hildebrandt, J. Koeth, Proc. SPIE 8640, Novel In-Plane Semiconductor Lasers XII, 2013, 864008.

#40 Comb-assisted spectroscopy of CO2 absorption profiles in the near- and mid-infrared regions;
A. Gambetta, D. Gatti, A. Castrillo, N. Coluccelli, G. Galzerano, P. Laporta, L. Gianfrani, M. Marangoni, Appl. Phys. B, 109, 3, Nov. 2012, pp. 385-390.

#45 Measurements of CO2 in a multipass cell and in a hollow-core photonic bandgap fiber at 2 µm;
J. A. Nwaboh, J. Hald, J. K. Lyngsø, J. C. Petersen, O. Werhahn, Appl. Phys. B, 109, 3, Nov. 2012, pp. 187-194.

#50 Mid-IR difference frequency laser-based sensors for ambient CH4, CO, and N2O monitoring;
J. J. Scherer, J. B. Paul, H. J. Jost, Marc L. Fischer, Appl. Phys. B, 109, 3, Nov. 2012, pp. 271-277.

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