NT270 series

Tunable Wavelength NIR-IR Range DPSS Lasers
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  • DPSS pump laser and OPO system
  • Tuning from 2500 to 12000 nm
  • <7 ns pulse duration
  • Narrow linewidth
  • DPSS pump laser and OPO system
  • Tuning from 2500 to 12000 nm
  • <7 ns pulse duration
  • Narrow linewidth

Features & Applications

Features

  • Integrates DPSS pump laser and OPO into single housing
  • Separate output ports for the pump laser and OPO beams
  • OPO output wavelength range from 2500 nm to 12000 nm (depending on model)
  • Narrow linewidth
  • Hands-free tuning
  • <7 ns pulse duration
  • Remote control via key pad or PC

Applications

  • Scanning Near-field Optical Microscopy (s-SNOM) microscopy
  • Single molecule vibrational spectroscopy
  • IR spectroscopy
  • Gas spectroscopy

BENEFITS

  • Wide (2500 – 12000 nm) tuning range is highly useful for s-SNOM and other IR applications
  • NT270 is the cost effective solution covering a wide tuning range from a single source
  • End pumping with diode technology ensures high reliability and lots of fired shots leading to low maintenance costs
  • High integration level saves valuable space in the laboratory
  • Air cooling eliminates the need for water, ensuring easy operation and simple installation or integration
  • 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, LAN and WLAN ensures easy control and integration with other equipment

Description

NT270 series tunable laser systems integrate into a single compact housing a nanosecond Optical Parametric Oscillator (OPO) and Diode-Pumped Solid–State (DPSS) Q-switched pump laser.

Diode pumping enables fast data acquisition at high pulse repetition rates up to 1 kHz while avoiding frequent flashlamp changes that are common when flashlamp pumped lasers are used. The pump lasers do not require water for cooling, thus further reducing running and maintenance costs.

All lasers feature motorized tuning across the specified tuning range. The output wavelength can be set from control pad with backlit display that is easy to read even while wearing laser safety glasses. Alternatively, the laser can be controlled also from personal computer using supplied LabVIEW™ drivers.

High conversion efficiency, stable output, easy maintenance and compact size make our systems excellent choice for lots of applications.

NT270 series available models

ModelFeature
NT277High pulse repetition rate OPO producing tunable output in 2500 – 4475 nm spectral range
NT277-XIRTunable output from NIR to far-IR range, 2500 nm to 12 000 nm

Specifications

Model NT277NT277-XIR
OPO 1)
Wavelength range
    Idler2500 – 4475 nm2500 – 4475 nm
4500 – 12000 nm 2)
Pulse energy 3)
    Idler80 μJ at 3000 nm80 µJ at 3000 nm
20 µJ at 7000 nm
Pulse repetition rate1000 Hz
Linewidth 4) <10 cm-1 <12 cm-1
Tuning resolution 5)
    Idler1 cm⁻¹
Polarization
    Idler vertical horizontal
Typical beam diameter 6) 7)4 mm6 mm
PUMP LASER
Pump wavelength1064 nm
Typical pump pulse energy 8)1.9 mJ
Pulse duration 9)<10 ns
Beam qualityfit to Gaussian >90%
Pulse energy stability (StdDev) < 0.5 %
PHYSICAL CHARACTERISTICS
Unit size (W × L × H)305 × 701 × 270 mm
Power supply size (W × L × H)365 × 395 × 290 mm
Umbilical length2.5 m
OPERATING REQUIREMENTS
Coolingby air
Room temperature18 – 27 °C
Relative humidity20 – 80 % (non-condensing)
Power requirements110 – 240 V AC, single phase 50/60 Hz
Power consumption< 0.5 kW
Cleanness of the roomnot worse than ISO Class 9
  1. Due to continuous improvement, all specifications are subject to change. Parameters marked typical are illustrative; 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 NT277, NT277-XIR unit and at 7000 nm for NT277-XIR units and for basic system without options.
  2. Available wavelength range. Custom tuning ranges are available.
  3. See tuning curves for typical outputs at other wavelengths.
  4. Higher energy 10 – 150 cm⁻¹ option is available for 2500 – 4475 nm tuning range. Narrow linewidth (<10 cm-1) operation mode is impossible with this option.
  5. For manual input from PC. When wavelength is controlled from keypad, tuning resolution is 1 nm.
  6. Measured at the wavelength indicated in the “Pulse energy” specification row.
  7. Beam diameter is measured at the 1/e² level at the laser output and varies depending on the wavelength.
  8. The pump laser pulse energy will be optimized for the best OPO performance. The actual pump laser output can vary with each unit we manufacture.
  9. Measured at FWHM level with photodiode featuring 1 ns rise time and 300 MHz bandwidth oscilloscope.

Note: Laser must be connected to the mains electricity all the time. If there will be no mains electricity for longer that 1 hour then laser (system) needs warm up for a few hours before switching on.

Performance & Drawings

Publications

Found total :
5 articles, 5 selected
Application selected :
All Applications
All Applications
Scientific Applications
Infrared Radiation
Photolysis – breaking down of a chemical compound by photons
Time Resolved Infrared Microscopy
Laser Spectroscopy
Absorption Spectroscopy
Time-resolved Spectroscopy
Photodisociation Spectroscopy
Biomedical – applications focusing on the biology of human health and disease
Photoacoustic Imaging – biomedical imaging modality based on the photoacoustic effect

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.

High-resolution, high-contrast mid-infrared imaging of fresh biological samples with ultraviolet-localized photoacoustic microscopy

Related applications:  Photoacoustic Imaging Biomedical Time Resolved Infrared Microscopy

Authors:  Junhui Shi, Terence T. W. Wong, Yun He, Lei Li, Ruiying Zhang, Christopher S. Yung, Jeeseong Hwang, Konstantin Maslov, Lihong V. Wang

Mid-infrared (MIR) microscopy provides rich chemical and structural information about biological samples, without staining. Conventionally, the long MIR wavelength severely limits the lateral resolution owing to optical diffraction; moreover, the strong MIR absorption of water ubiquitous in fresh biological samples results in high background and low contrast. To overcome these limitations, we propose a method that employs photoacoustic detection highly localized with a pulsed ultraviolet laser on the basis of the Grüneisen relaxation effect. For cultured cells, our method achieves water-background suppressed MIR imaging of lipids and proteins at ultraviolet resolution, at least an order of magnitude finer than the MIR diffraction limits. Label-free histology using this method is also demonstrated in thick brain slices. Our approach provides convenient high-resolution and high-contrast MIR imaging, which can benefit the diagnosis of fresh biological samples.

Published: 2019.   Source: Nature Photonics, vol. 13, pp. 609–615 (2019)

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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