Top Wavelength: 3345 nm & 3375 nm DFB Laser

DFB interband cascade lasers at 3345 nm & 3375 nm nm are used for ethane detection.
Please have a look at the key features, specifications and applications.

TO66 header

Key features of nanoplus distributed feedback interband cascade lasers

  • monomode
  • continuous wave
  • room temperature
  • low power consumption
  • tunable
  • custom wavelengths

Why choose nanoplus distributed feedback interband cascade lasers

  • 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 20 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 30,000 installations worldwide prove the reliability of nanoplus lasers.

Quick description of nanoplus distributed feedback 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 3345 nm & 3375 nm


Mountings & Accessories


Papers & Links

The following table summarizes the typical DFB laser specifications at 3345 nm & 3375 nm.

operating wavelength (at Top, Iop)λopnm3345 / 3375
optical output power (at λop) PopmW15
operating currentIopmA120
operating voltageVopV5
threshold currentIthmA152540
side mode suppression ratioSMSRdB> 35
current tuning coefficientCInm / mA0.10
temperature tuning coefficientCTnm / K0.35
operating chip temperatureTop°C+15+20+40
operating case temperature*TC°C-20+25+55
storage temperature*TS°C-30+20+70

* non-condensing

nanoplus distributed feedback 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 a nanoplus 3345 nm DFB interband cascade laser
Figure 1: Spectrum of a nanoplus 3345 nm DFB interband cascade laser
Figure 2: Mode hop free tuning of a nanoplus 3345 nm DFB interband cascade laser
Figure 2: Mode hop free tuning of a nanoplus 3345 nm DFB interband cascade laser
Figure 3: Typical power, current and voltage characteristics of a nanoplus 3345 nm DFB interband cascade laser
Figure 3: Typical power, current and voltage characteristics of a nanoplus 3345 nm DFB interband cascade laser

If you are uncertain whether you require a distributed feedback laser, compare the specifications with our Fabry-Pérot lasers or contact us.

Free space mounting

nanoplus developed a specific free space package for interband cascade lasers. The TO66 header disposes of an extra large thermo-electric cooler. It is hermetically sealed with a black cap and anti reflection coated window. Please click on the mounting for detailed specifications and dimensions.

TO66 header
with TEC and thermistor,
black cap and AR coated window
TO66 header

OEM mounting

For our OEM customers we offer a very small footprint package that is easy to integrate.

chip on heatspreader with NTC, without TEC


TO66 heatsink
TO66 heatsink

The nanoplus TO66 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

Please find below a number of application samples.

Emission control of greenhouse gases: C2H6
Ethane is an important greenhouse gas that has a critical impact on climate change. Emissions are related to fossil fuel and biofuel consumption, biomass combustion and natural gas losses. Trace gas detection of ethane is an important tool to monitor greenhouse gases. [10, 120, 129, 146, 147]

Emission control by methane source identification: C2H6
Ethane is a by-product of methane emissions. The ethane ratio varies between methane emissions from thermogenic and biogenic sources. This allows differentiating oil and gas reserves from those of livestock, landfills, wetlands or stagnant water. Studies are executed on behalf of the US Environmental Protection Agency to quantify methane emissions caused byincreased natural gas exploration and production in the US. A newly developed ethane spectrometer delivers 1 second ethane measurements with sub-ppb precision in an ethane-methane mixture. [61]

Monitoring of breath gas: C2H6 and C2H2
Medical breath analysis considers ethane and acetylene as a biomarkers for asthma, schizophrenia or lung cancer. The research field of breath analysis uses methane as a biomarker for intestinal problems. [10]

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.

#10 Continuous wave, distributed feedback diode laser based sensor for trace-gas detection of ethane;
K. Krzempek, R. Lewicki, L. Naehle, M. Fischer, J. Koeth, S. Belahsene, Y. Rouillard, L. Worschech, F.K. Tittel, Appl. Phys. B 106, 2, 2012, pp 251-255.

#53 CW DFB RT diode laser-based sensor for trace-gas detection of ethane using a novel compact multipass gas absorption cell;
K. Krzempek, M. Jahjah, R. Lewicki, P. Stefanski, S. So, D. Thomazy, F.K. Tittel, Appl. Phys. B, 112, 4, Sept. 2013, pp. 461-465.

#61 Demonstration of an Ethane Spectrometer for Methane Source Identification;
T.I. Yacovitch, S.C. Herndon, J.R. Roscioli, C. Floerchinger, R.M. McGovern, M. Agnese, G. Petron, J. Kofler, C. Sweeney, A. Karion, S.A. Conley, E.A. Kort, L. Naehle, M. Fischer, L. Hildebrandt,.J. Koeth, J.B. McManus, D.D. Nelson, M.S. Zahniser, C.E. Kolb, Environ. Sci. Technol., 48, 2014, 8028-8034.

#77 Compact TDLAS based sensor design using interband cascade lasers for mid-IR trace gas sensing;
L. Dong, F. K. Tittel, C. Li, N. P. Sanchez, H. Wu, C. Zheng, Y. Yu, A. Sampaolo, R. J. Griffin; Optics Express Vol. 24, Issue 6, 2016, pp. A528-A535.

#82 Ppb-level mid-infrared ethane detection based on three measurement schemes using a 3.34 μm continuous-wave interband cascade laser;
C. Li, C. Zheng, L. Dong, W. Ye, F. K. Tittel, Y. Wang, Appl. Phys. B, July 2016, 122:185.

# 107 Recent progress in laser‑based trace gas instruments: performance and noise analysis;
J. B. McManus, M. S. Zahniser, D. D. Nelson et. al., Appl. Phys. B, 2015, 119: 203.

#120 Interband cascade laser based quartz-enhanced photoacoustic sensor for multiple hydrocarbons detection;
A. Sampaolo, S. Csutak, P. Patimisco, M. Giglio, G. Menduni, V. Passaro, F. K. Tittel, M. Deffenbaugh, V. Spagnolo, Proc. SPIE 10540, Quantum Sensing and Nano Electronics and Photonics XV, 105400C, Jan. 26th, 2018.

#123 A streamlined approach to hybrid-chemistry modeling for a low cetane-number alternative jet fuel;
N. H. Pinkowski, Y. Wang , S. J. Cassady , D. F. Davidson , R. K. Hanson, Combustion and Flame, Vol. 208, Oct. 2019, pp. 15-26.

#124 Multi-wavelength speciation of high-temperature 1-butene pyrolysis;
N. H. Pinkowski, S. J. Cassady, D. F. Davidson, R. K. Hanson, Fuel, Vol. 244, 15th May 2019, pp. 269-281.

# 125 Tomographic laser absorption imaging ofcombustion species and temperature in the mid-wave infrared;
C. Wei, D. I. Pineda, C. S. Goldenstein, R. M. Spearrin, Opt. Exp., Vol. 26, Iss. 16, 2018, pp. 20944 - 20951.

#126 Time-resolved laser absorption imaging of ethane at 2 kHz in unsteady partially premixed flames;
K. K. Schwarm, C. Wei, D. I. Pineda, R. M. Spearrin, Appl. Opt., Vol. 58, Iss. 21, Jul. 2019, pp. 5656 - 5662.

#129 Quartz-enhanced photoacoustic spectroscopy for hydrocarbon trace gas detection and petroleum exploration;
A. Sampaoloa, G. Mendunib,P. Patimiscoa, M. Giglioa, V. M.N. Passaroc, L. Donga, H. Wua, F. K. Tittel, V. Spagnoloa, Fuel, Vol. 277, 2020.

#141 Interband cascade laser arrays for simultaneous and selective analysis of C1–C5 hydrocarbons in petrochemical industry;
J. Scheuermann, P. Kluczynski, K. Siembab, M. Straszewski, J. Kaczmarek, R. Weih, M. Fischer, J. Koeth, A. Schade, S. Höfling, Appl. Spectrosc., January, 2021.

#143 Methane, ethane and propane detection using a compact quartz enhanced photoacoustic sensor and a single interband cascade laser;
A. Sampaolo, S. Csutak, P. Patimisco, M. Giglio, G. Menduni, V. Passaro, F. K. Tittel, M. Deffenbaugh, V. Spagnolo, Sensors and Actuators B: Chemical, Vol. 282, 2019, pp. 952-960.

#146 High resolution spectra of 13C ethane and propane isotopologues photoacoustically measured using interband cascade lasers near 3.33 and 3.38 μm, respectively;
A. Loh, M. Wolff, Journal of Quantitative Spectroscopy & Radiative Transfer 227, 2019, pp. 111 – 116.

#152 The interband cascade laser;
J. R. Meyer, W. Bewley, C. L. Canedy, C. S. Kim, M. Kim, C. D. Merritt, I. Vurgaftman, Photonics, Vol. 7, No. 3 (75), 2020.

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