NT370 series

High Energy IR Range Tunable Lasers
  • High energy MIR-IR OPO system
  • Ultrabroad tuning from 2500 to 18000 nm
  • Up to 15 mJ energy
  • 10/20 Hz repetition rate
  • High energy MIR-IR OPO system
  • Ultrabroad tuning from 2500 to 18000 nm
  • Up to 15 mJ energy
  • 10/20 Hz repetition rate

Features & Applications


  • Hands-free, automated wavelength tuning
  • Up to 15 mJ pulse energy in mid and 1 mJ in far IR spectral range
  • Less than 8 cm⁻¹ linewidth
  • 3 – 5 ns pulse duration
  • 10 or 20 Hz pulse repetition rate
  • Remote control via key pad or PC
  • Separate output port for 1064 nm pump beam option
  • OPO pump energy monitoring
  • Replacement of the flashlamps without misalignment of the laser cavity


  • Vibrational spectroscopy
  • Cavity ring-down CRDS, cavity ring-down laser absorption CRLAS spectroscopy
  • Infrared spectroscopy
  • Gas spectroscopy


  • Wide tuning range in 2500 – 4400 nm or 5500 – 18 000 nm is highly useful for s-SNOM and other IR applications
  • NT370 is a cost effective solution covering a wide tuning range from a single source
  • Superior tuning resolution (1 cm⁻¹) allows recording of high quality spectra
  • High integration level saves on valuable space in the laboratory
  • Flashlamps replacement without misalignment of the laser cavity saves on maintenance costs
  • In-house design and manufacturing of complete systems, including pump lasers, guarantees on-time warranty and post warranty services and spares supply
  • Variety of control interfaces: USB, RS232, optional LAN and WLAN ensures easy control and integration with other equipment


NT370 series tunable laser seamlessly integrates in a compact housing the nanosecond optical parametric oscillator and Nd:YAG Q-switched laser. Pumped by fundamental harmonics output the lasers provides tuning in mid- and far-infrared spectral ranges.

NT373-XIR model uses IR crystal based cascade OPO for tunable output in 5500 – 18000 nm range. Customized tuning ranges are available upon request. The linewidth of NT373-XIR model is nearly constant across tuning range and it is less than 8 cm⁻¹.

NT377 model produces tunable output in 2500 – 4400 nm range. Pulse energy is exceeding 10 mJ for wavelengths shorter than 3600 nm, while linewidth is below 8 cm⁻¹. Because of narrow linewidth of output radiation the laser is suitable for many infrared spectroscopic applications, for example cavity ring-down spectroscopy, gas detection and remote sensing.

The device is controlled from the remote keypad or from PC using LabView™ drivers that are supplied together with the system. The remote pad features a backlit display that is easy to read even while wearing laser safety glasses. System is designed for easy and cost-effective maintenance. Replacement of flashlamps can be done without misalignment of the laser cavity and deterioration of laser performance. OPO pump energy monitoring system helps to increase lifetime of the optical components.


OPO 1)
Wavelength range2500 – 4400 nm5500 – 18000 nm 2)
Output pulse energy 3)15 mJ1 mJ
Linewidth 4)< 8 cm-1
Tuning resolution 5)1 cm-1
Typical pulse duration 6)3 – 5 ns
Typical beam diameter 7)8 mm10 mm
Pump wavelength1064 nm
Typical pump pulse energy250 mJ300 mJ
Pulse duration4 – 7 ns
Beam quality"Hat-top" in near field
Beam divergence< 0.5 mrad
Pulse energy stability (StdDev)< 1 %
Pulse repetition rate10 or 20 Hz
Unit size (W × L × H)456 × 820 × 274 mm456 × 1030 × 274 mm
Power supply size (W × L × H)330 × 490 × 585 mm
Umbilical length 2.5 m
Water consumption (max 20 °C) 9) 9)10 l/min
Room temperature 18 – 27 °C
Relative humidity20 – 80 % (non-condensing)
Power requirements 10)200 – 240 VAC, single phase, 50/60 Hz
Power consumption< 1.5 kVA
Cleanliness of the roomnot worse than ISO Class 9
  1. Due to continuous improvement, all specifications are subject to change without notice. Parameters marked typical are not specifications. They are indications of typical performance and will vary with each unit we manufacture. Unless stated otherwise all specifications are measured at 3000 nm for NT377 unit and at 7000 nm for NT373-XIR unit and for basic system without options.
  2. Additional output in 1780 – 2010 nm and 2300 – 2645 nm ranges is possible. Please contact Ekspla for more detailed specifications.
  3. Output is specified at wavelengths defined in note 1. See tuning curves for typical outputs at other wavelengths.
  4. Linewidth is specified at wavelengths defined in note 1.
  5. When wavelength is controlled from PC. When wavelength is controlled from keypad, tuning resolution is 1 nm.
  6. Measured art FWHM level with photodiode featuring 1 ns rise time and 300 MHz bandwidth oscilloscope.
  7. Beam diameter is measured at the 1/e² level and varies depending on the wavelength.
  8. Laser output will be optimized for the best OPO operation and specification may vary with each unit we manufacture.
  9. Air cooled power supply is available as an option.
  10. Should be specified when ordering.

Accessories and Options

-AWWater-air cooling option
-2020 Hz PRR option
-HOptional 1064 nm output



Found total :
4 articles, 4 selected
Application selected :
All Applications
All Applications
Scientific Applications
Infrared Radiation
Photolysis – breaking down of a chemical compound by photons
Laser Spectroscopy
Absorption Spectroscopy
Time-resolved Spectroscopy
Photodisociation Spectroscopy

Infrared Multiple Photon Dissociation Spectroscopy of Hydrated Cobalt Anions Doped with Carbon Dioxide CoCO2(H2O)n, n=1–10, in the C−O Stretch Region

Related applications:  Laser Spectroscopy Time-resolved Spectroscopy Photodisociation Spectroscopy

Authors:  E. Barwa, M. Ončák, T.F. Pascher, A. Herburger, Ch. Linde, M.K. Beyer

We investigate anionic [Co,CO2,nH2O] clusters as model systems for the electrochemical activation of CO2 by infrared multiple photon dissociation (IRMPD) spectroscopy in the range of 1250–2234 cm−1 using an FT‐ICR mass spectrometer. We show that both CO2 and H2O are activated in a significant fraction of the [Co,CO2,H2O] clusters since it dissociates by CO loss, and the IR spectrum exhibits the characteristic C−O stretching frequency. About 25 % of the ion population can be dissociated by pumping the C−O stretching mode. With the help of quantum chemical calculations, we assign the structure of this ion as Co(CO)(OH)2. However, calculations find Co(HCOO)(OH) as the global minimum, which is stable against IRMPD under the conditions of our experiment. Weak features around 1590–1730 cm−1 are most likely due to higher lying isomers of the composition Co(HOCO)(OH). Upon additional hydration, all species [Co,CO2,nH2O], n≥2, undergo IRMPD through loss of H2O molecules as a relatively weakly bound messenger. The main spectral features are the C−O stretching mode of the CO ligand around 1900 cm−1, the water bending mode mixed with the antisymmetric C−O stretching mode of the HCOO ligand around 1580–1730 cm−1, and the symmetric C−O stretching mode of the HCOO ligand around 1300 cm−1. A weak feature above 2000 cm−1 is assigned to water combination bands. The spectral assignment clearly indicates the presence of at least two distinct isomers for n ≥2.

Published: 2019.   Source: Chem. Eur. J. 2020, 26, 1074

Infrared Spectroscopy of Size‐Selected Hydrated Carbon Dioxide Radical Anions CO2.−(H2O)n (n=2–61) in the C−O Stretch Region

Related applications:  Infrared Radiation Laser Spectroscopy Absorption Spectroscopy Time-resolved Spectroscopy

Authors:  A. Herburger, M. Ončák, C.-K. Siu, E.G. Demissie, J. Heller, W.K. Tang, M.K. Beyer

Understanding the intrinsic properties of the hydrated carbon dioxide radical anions CO2.−(H2O)n is relevant for electrochemical carbon dioxide functionalization. CO2.−(H2O)n (n=2–61) is investigated by using infrared action spectroscopy in the 1150–2220 cm−1 region in an ICR (ion cyclotron resonance) cell cooled to T=80 K. The spectra show an absorption band around 1280 cm−1, which is assigned to the symmetric C−O stretching vibration νs. It blueshifts with increasing cluster size, reaching the bulk value, within the experimental linewidth, for n=20. The antisymmetric C−O vibration νas is strongly coupled with the water bending mode ν2, causing a broad feature at approximately 1650 cm−1. For larger clusters, an additional broad and weak band appears above 1900 cm−1 similar to bulk water, which is assigned to a combination band of water bending and libration modes. Quantum chemical calculations provide insight into the interaction of CO2.− with the hydrogen‐bonding network.

Published: 2019.   Source: Chem. Eur. J. 2019, 25, 10165.

Photodissociation of Sodium Iodide Clusters Doped with Small Hydrocarbons

Related applications:  Photolysis

Authors:  N. K. Bersenkowitsch, Dr. M. Ončák, J. Heller, Dr. Ch. van der Linde, Prof. Dr. M. K. Beyer

Marine aerosols consist of a variety of compounds and play an important role in many atmospheric processes. In the present study, sodium iodide clusters with their simple isotope pattern serve as model systems for laboratory studies to investigate the role of iodide in the photochemical processing of sea‐salt aerosols. Salt clusters doped with camphor, formate and pyruvate are studied in a Fourier transform ion cyclotron resonance mass spectrometer (FT‐ICR MS) coupled to a tunable laser system in both UV and IR range. The analysis is supported by ab initio calculations of absorption spectra and energetics of dissociative channels. We provide quantitative analysis of IRMPD measurements by reconstructing one‐photon spectra and comparing them with the calculated ones. While neutral camphor is adsorbed on the cluster surface, the formate and pyruvate ions replace an iodide ion. The photodissociation spectra revealed several wavelength‐specific fragmentation pathways, including the carbon dioxide radical anion formed by photolysis of pyruvate. Camphor and pyruvate doped clusters absorb in the spectral region above 290 nm, which is relevant for tropospheric photochemistry, leading to internal conversion followed by intramolecular vibrational redistribution, which leads to decomposition of the cluster. Potential photodissociation products of pyruvate in the actinic region may be formed with a cross section of <2×10−20 cm2, determined by the experimental noise level.

Published: 2018.   Source: Chem. Eur.J. 2018, 24,12433 –12443

Infrared spectroscopy of O˙− and OH− in water clusters: evidence for fast interconversion between O˙− and OH˙OH−

Related applications:  Photolysis

Authors:  J. Lengyel, M. Ončák, A. Herburger, Ch. van der Lindea, M. K. Beyer

We present infrared multiple photon dissociation (IRMPD) spectra of (H2O)n and (H2O)nOH cluster ensembles for [n with combining macron] ≈ 8 and 47 in the range of 2400–4000 cm−1. Both hydrated ions exhibit the same spectral features, in good agreement with theoretical calculations. Decomposition of the calculated spectra shows that bands originating from H2O⋯O˙ and H2O⋯OH interactions span almost the whole spectral region of interest. Experimentally, evaporation of OH˙ is observed to a small extent, which requires interconversion of (H2O)n into (H2O)n–1OH˙OH, with subsequent H2O evaporation preferred over OH˙ evaporation. The modeling shows that (H2O)n and (H2O)n–1OH˙OH cannot be distinguished by IRMPD spectroscopy.

Published: 2017.   Source: Phys. Chem. Chem. Phys., 2017,19, 25346-25351

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