NT242 series

Broadly Tunable kHz Pulsed DPSS Lasers
  • High repetition rate OPO system
  • Ultrabroad tuning from 210 to 2600 nm
  • More than 60 µJ output pulse energy in UV
  • 1 kHz repetition rate
  • High repetition rate OPO system
  • Ultrabroad tuning from 210 to 2600 nm
  • More than 60 µJ output pulse energy in UV
  • 1 kHz repetition rate

Features & Applications


  • Integrates DPSS pump laser and OPO into a single housing
  • Hands-free no-gap wavelength tuning from 210 to 2600 nm
  • 1000 Hz pulse repetition rate
  • More than 60 µJ output pulse energy in UV
  • Less than 5 cm⁻¹ linewidth
  • 3 – 6 ns pulse duration
  • Remote control via key pad or PC
  • Optional separate output for the OPO pump beam 355 nm, 532 nm or 1064 nm


  • Laser-induced fluorescence spectroscopy
  • Pump-probe spectroscopy
  • Non-linear spectroscopy
  • Time-resolved spectroscopy
  • Photobiology
  • Remote sensing
  • Determination of the telescope throughput


  • High repetition rate 1000 Hz enables fast data collection
  • End pumping with diode technology ensures high reliability and low maintenance costs
  • Narrow linewidth (down to 3 cm⁻¹) and superior tuning resolution (1 – 2 cm⁻¹) allow recording of high quality spectra
  • High integration level saves valuable space in the laboratory
  • 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
  • Attenuator and fiber coupling options facilitate incorporation of NT242 systems into various experimental environments

Description & Options

NT242 series lasers produce pulses at an unprecedented 1 kHz pulse repetition rate, tunable over a broad spectral range. Integrated into a single compact housing, the diode pumped Q-switched Nd:YAG laser and OPO offers hands‑free, no-gap tuning from 210 to 2600 nm. With its 1000 Hz repetition rate, the NT242 series laser establishes itself as a versatile tool for many laboratory applications, including laser induced fluorescence, flash photolysis, photobiology, metrology, remote sensing, etc.

NT242 series systems can be controlled from a remote control pad or/and a computer using supplied LabVIEW™ drivers. The control pad allows easy control of all parameters and features on a backlit display that is easy to read even with laser safety eyewear.

Thanks to a DPSS pump source, the laser requires little maintenance. It is equipped with air-cooled built-in chiller, which further reduces running costs. A built‑in OPO pump energy monitor allows monitoring of pump laser performance without the use of external power meters. The optional feature provides a separate output port for the 1064, 532 or 355 nm beam.

Accessories and optional items

-SHTuning range extension in UV range (210 – 300 nm) by second harmonics generation
-SFTuning range extension in 300 – 405 nm range by sum-frequency generation
-SH/-SFTuning range extension in 210 – 405 nm range by combining second harmonics and sum-frequency generator outputs for maximum possible pulse energy
-SCUSpectral filtering accessory for improved spectral purity of pulses
-H, -2H, -3H1064, 532 and 355 nm output via separate port
-FCFiber coupler
-AttnAttenuator option


OPO 1)
Wavelength range
    Signal405 – 710 nm
    Idler710 – 2600 nm
    SH and SF210 – 300 nm300 – 405 nm210 – 405 nm
Pulse energy 2)
    OPO450 µJ
    SH and SF40 µJ at 230 nm60 µJ at 320 nm
Pulse repetition rate1000 Hz
Pulse duration 3)3 – 6 ns
Linewidth 4) < 5 cm-1
Tuning resolution 5)
    Signal 1 cm-1
    Idler1 cm-1
    SH and SF2 cm-1
    SH and SFvertical
Typical beam diameter 6)3 × 6 mm
Pump wavelength 7)355 nm355 / 1064 nm
Typical pump pulse energy 8)3 mJ3 / 1 mJ
Pulse duration 3)4 – 6 ns at 1064 nm
Unit size (W × L × H)456 × 1040 × 297 mm
Power supply size (W × L × H)520 × 400 × 286 mm
Umbilical length2.5 m
Coolingbuilt-in chiller
Room temperature18 – 27 °C
Relative humidity20 – 80 % (non-condensing)
Power requirements100 – 240 V AC, single phase 50/60 Hz
Power consumption < 1.5 kVA
  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 450 nm and for basic system without options.
  2. See tuning curves for typical outputs at other wavelengths.
  3. Measured at FWHM level with photodiode featuring 1 ns rise time and 300 MHz bandwidth oscilloscope.
  4. Linewidth is <8 cm⁻¹ for 210 – 405 nm range.
  5. For manual input from PC. When wavelength is controlled from keypad, tuning resolution is 0.1 nm for signal, 1 nm for idler and 0.05 nm for SH and SF.
  6. Beam diameter is measured at 450 nm at the 1/e2 level and can vary depending on the pump pulse energy.
  7. Separate output port for the 3rd and other harmonic are optional.
  8. The pump laser pulse energy will be optimized for best OPO performance. The actual pump laser output can vary with each unit we manufacture.

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


Found total :
10 articles, 10 selected
Application selected :
All Applications
All Applications
Scientific Applications
Photolysis – breaking down of a chemical compound by photons
Metrology – measurement and calibration related applications
Laser Spectroscopy
Absorption Spectroscopy
Luminescence Spectroscopy
Biomedical – applications focusing on the biology of human health and disease
Photoacoustic Imaging – biomedical imaging modality based on the photoacoustic effect

Contrast Agent Enhanced Multimodal Photoacoustic Microscopy and Optical Coherence Tomography for Imaging of Rabbit Choroidal and Retinal Vessels in vivo

Related applications:  Photoacoustic Imaging Biomedical

Authors:  V.P. Nguyen, Y. Li, W. Qian, B. Liu, C. Tian, W. Zhang, Z. Huang, A. Ponduri, M. Tarnowski, X. Wang, Y.M. Paulus

Multimodal imaging with photoacoustic microscopy (PAM) and optical coherence tomography (OCT) can be an effective method to evaluate the choroidal and retinal microvasculature. To improve the efficiency for visualizing capillaries, colloidal gold nanoparticles (AuNPs) have been applied as a multimodal contrast agent for both OCT and PAM imaging by taking advantage of the strong optical scattering and the strong optical absorption of AuNPs due to their surface plasmon resonance. Ultra-pure AuNPs were fabricated by femtosecond laser ablation, capped with polyethylene glycol (PEG), and administered to 13 New Zealand white rabbits and 3 Dutch Belted pigmented rabbits. The synthesized PEG-AuNPs (20.0 ± 1.5 nm) were demonstrated to be excellent contrast agents for PAM and OCT, and do not demonstrate cytotoxicity to bovine retinal endothelial cells in cell studies. The image signal from the retinal and choroidal vessels in living rabbits was enhanced by up to 82% for PAM and up to 45% for OCT, respectively, by the administered PEG-AuNPs, which enables detection of individual blood vessels by both imaging modalities. The biodistribution study demonstrated the AuNP accumulated primarily in the liver and spleen. Histology and TUNEL staining did not indicate cell injury or death in the lung, liver, kidney, spleen, heart, or eyes up to seven days after AuNP administration. PEG-AuNPs offer an efficient and safe contrast agent for multimodal ocular imaging to achieve improved characterization of microvasculature.

Published: 2019.   Source: Scientific Reports 9, 5945 (2019)

High-resolution multimodal photoacoustic microscopy and optical coherence tomography image-guided laser induced branch retinal vein occlusion in living rabbits

Related applications:  Photoacoustic Imaging Biomedical

Authors:  V.P. Nguyen, Y. Li, W. Zhang, X. Wang, Y. M. Paulus

Joint high-resolution multimodal photoacoustic microscopy (PAM) and optical coherence tomography (OCT) was developed to improve the efficiency for visualizing newly developed retinal neovascularization (RNV) and to monitor the dynamic changes of retinal vein occlusion (RVO) in living rabbits. The RNV and RVO models were created in New Zealand rabbits by Rose Bengal laser-induced RVO. Dual modalities imaging equipment, including color fundus photography, fluorescein angiography (FA), OCT, and PAM, was used to image and assess the changes of retinal vasculature. In vivo experimental results exhibited that not only the treatment boundaries and the position of the occluded vasculature but also the structure of individual RNV were markedly observed using PAM platform with great resolution and high image contrast. The laser light energy of 80 nJ was used to induce photoacoustic signal, which is approximately half the energy of the American National Standards Institute safety limit. A cross-sectional structure of RNV was identified with the OCT modality. Furthermore, vibrant transformations in the RNV and the retinal morphology were examined at different times after laser occlusion: days 4, 28, 35, 49, and 90. PAM revealed high contrast and high resolution vascular imaging of the retina and choroid with amplified penetration depth. Through the present custom-built imaging system, both RNV and RVO can be reconstructed and observed in two and three dimensions. A unique dual modality A unique dual modality PAM and OCT can help precisely visualize and distinguish individual microvessels, microvessel depth, and the surrounding anatomy. Thus, the proposed multimodal ocular imaging platform may offer a potential equipment to enhance classification of microvasculature in a reliable and proficient manner in larger rabbit eyes.

Published: 2019.   Source: Scientific Reports 9, 10560 (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

Photochemistry and spectroscopy of small hydrated magnesium clusters Mg+(H2O)n, n = 1–5

Related applications:  Photolysis

Authors:  M. Ončák, T. Taxer, E. Barwa, Ch. van der Linde, M. K. Beyer

Hydrated singly charged magnesium ions Mg+(H2O)n, n ≤ 5, in the gas phase are ideal model systems to study photochemical hydrogen evolution since atomic hydrogen is formed over a wide range of wavelengths, with a strong cluster size dependence. Mass selected clusters are stored in the cell of an Fourier transform ion cyclotron resonance mass spectrometer at a temperature of 130 K for several seconds, which allows thermal equilibration via blackbody radiation. Tunable laser light is used for photodissociation. Strong transitions to D1–3 states (correlating with the 3s-3px,y,z transitions of Mg+) are observed for all cluster sizes, as well as a second absorption band at 4–5 eV for n = 3-5. Due to the lifted degeneracy of the 3px,y,z energy levels of Mg+, the absorptions are broad and red shifted with increasing coordination number of the Mg+ center, from 4.5 eV for n = 1 to 1.8 eV for n = 5. In all cases, H atom formation is the dominant photochemical reaction channel. Quantum chemical calculations using the full range of methods for excited state calculations reproduce the experimental spectra and explain all observed features. In particular, they show that H atom formation occurs in excited states, where the potential energy surface becomes repulsive along the O⋯H coordinate at relatively small distances. The loss of H2O, although thermochemically favorable, is a minor channel because, at least for the clusters n = 1-3, the conical intersection through which the system could relax to the electronic ground state is too high in energy. In some absorption bands, sequential absorption of multiple photons is required for photodissociation. For n = 1, these multiphoton spectra can be modeled on the basis of quantum chemical calculations.

Published: 2018.   Source: J. Chem. Phys. 149, 044309 (2018)

Electronic spectroscopy and nanocalorimetry of hydrated magnesium ions [Mg(H2O)n]+, n = 20–70: spontaneous formation of a hydrated electron?

Related applications:  Photolysis

Authors:  T. Taxer, M. Ončák, E. Barwa, Ch. van der Lindea, M. K. Beyer

Hydrated singly charged magnesium ions [Mg(H2O)n]+ are thought to consist of an Mg2+ ion and a hydrated electron for n > 15. This idea is based on mass spectra, which exhibit a transition from [MgOH(H2O)n−1]+ to [Mg(H2O)n]+ around n = 15–22, black-body infrared radiative dissociation, and quantum chemical calculations. Here, we present photodissociation spectra of size-selected [Mg(H2O)n]+ in the range of n = 20–70 measured for photon energies of 1.0–5.0 eV. The spectra exhibit a broad absorption from 1.4 to 3.2 eV, with two local maxima around 1.7–1.8 eV and 2.1–2.5 eV, depending on cluster size. The spectra shift slowly from n = 20 to n = 50, but no significant change is observed for n = 50–70. Quantum chemical modeling of the spectra yields several candidates for the observed absorptions, including five- and six-fold coordinated Mg2+ with a hydrated electron in its immediate vicinity, as well as a solvent-separated Mg2+/e pair. The photochemical behavior resembles that of the hydrated electron, with barrierless interconversion into the ground state following the excitation.

Published: 2018.   Source: Faraday Discuss., 2019, Advance Article

Photodissociation spectroscopy of protonated leucine enkephalin

Related applications:  Photolysis

Authors:  A. Herburger, Ch. van der Linde, M. K. Beyer

Protonated leucine enkephalin (YGGFL) was studied by ultraviolet photodissociation (UVPD) from 225 to 300 nm utilizing an optical parametric oscillator tunable wavelength laser system (OPO). Fragments were identified by absolute mass measurement in a 9.4 T Fourier transform ion cyclotron resonance mass spectrometer (FT-ICR MS). Bond cleavage was preferred in the vicinity of the two aromatic residues, resulting in high ion abundances for a4, a1, b3, y2 and y1 fragments. a, b and y ions dominated the mass spectrum, and full sequence coverage was achieved for those types. Photodissociation was most effective at the short wavelength end of the studied range, which is assigned to the onset of the La π–π* transition of the tyrosine chromophore, but worked well also at the Lb π–π* chromophore absorption maxima in the 35 000–39 000 cm−1 region. Several side-chain and internal fragments were observed. H atom loss is observed only above 41 000 cm−1, consistent with the requirement of a curve crossing to a repulsive 1πσ* state. It is suggested that the photochemically generated mobile H atom plays a role in further backbone cleavages, similar to the mechanism for electron capture dissociation. The b4 fragment is most intense at the Lb chromophore absorptions, undergoing additional fragmentation at higher photon energies. The high resolution of the FT-ICR MS revealed that out of all x and z-type fragments only x3 and x4 were formed, with low intensity. Other previously reported x- and z-fragments were re-assigned to internal fragments, based on exact mass measurement.

Published: 2017.   Source: Phys. Chem. Chem. Phys., 2017,19, 10786-10795

Luminescence spectroscopy of oxazine dye cations isolated in vacuo

Related applications:  Luminescence Spectroscopy

Authors:  Ch. Kjær, S. B. Nielsen

Here we report gas-phase action and luminescence spectra of cationic dyes derived from oxazine: cresyl violet (CV+), oxazine 170 (Ox-170+), nile blue (NB+), darrow red (DR+), oxazine 1 (Ox-1+), oxazine 4 (Ox-4+), and brilliant cresyl blue (BCB+). The first four have a benzofused structure, which results in asymmetric charge distributions along the long axis. The positive charge is also asymmetrically distributed in BCB+ while Ox-1+ and Ox-4+ are symmetric. As the ions are isolated in vacuo, there are no interactions with solvent molecules or counter ions, and the effect of chemical modifications is therefore more easily revealed than from solution-phase experiments. The transition energy decreases in the order: DR+ > CV+ > Ox-4+ > Ox-170+ > BCB+ > Ox-1+ > NB+, and the fluorescence from BCB+ is less than from the others. We discuss the results based on electron delocalisation, degree of charge-transfer character, rigidity of the chromophore structure, and substituents.

Published: 2019.   Source: Phys. Chem. Chem. Phys., 2019,21, 4600-4605

A cylindrical quadrupole ion trap in combination with an electrospray ion source for gas-phase luminescence and absorption spectroscopy

Related applications:  Absorption Spectroscopy Luminescence Spectroscopy

Authors:  M. H. Stockett, J. Houmøller, K. Støchkel, A. Svendsen, S. B. Nielsen

A relatively simple setup for collection and detection of light emitted from isolated photo-excited molecular ions has been constructed. It benefits from a high collection efficiency of photons, which is accomplished by using a cylindrical ion trap where one end-cap electrode is a mesh grid combined with an aspheric condenser lens. The geometry permits nearly 10% of the emitted light to be collected and, after transmission losses, approximately 5% to be delivered to the entrance of a grating spectrometer equipped with a detector array. The high collection efficiency enables the use of pulsed tunable lasers with low repetition rates (e.g., 20 Hz) instead of continuous wave (cw) lasers or very high repetition rate (e.g., MHz) lasers that are typically used as light sources for gas-phase fluorescence experiments on molecular ions. A hole has been drilled in the cylinder electrode so that a light pulse can interact with the ion cloud in the center of the trap. Simulations indicate that these modifications to the trap do not significantly affect the storage capability and the overall shape of the ion cloud. The overlap between the ion cloud and the laser light is basically 100%, and experimentally >50% of negatively charged chromophore ions are routinely photodepleted. The performance of the setup is illustrated based on fluorescence spectra of several laser dyes, and the quality of these spectra is comparable to those reported by other groups. Finally, by replacing the optical system with a channeltron detector, we demonstrate that the setup can also be used for gas-phase action spectroscopy where either depletion or fragmentation is monitored to provide an indirect measurement on the absorption spectrum of the ion.

Published: 2016.   Source: Review of Scientific Instruments 87, 053103 (2016)

Precise Throughput Determination of the PanSTARRS Telescope and the Gigapixel Imager Using a Calibrated Silicon Photodiode and a Tunable Laser: Initial Results

Related applications:  Metrology

Authors:  Ch. W. Stubbs, P. Doherty, C. Cramer, G. Narayan, Y. J. Brown, K. R. Lykke, J. T. Woodward, J. L. Tonry

We have used a precision-calibrated photodiode as the fundamental metrology reference in order to determine the relative throughput of the PanSTARRS telescope and the Gigapixel imager, from 400 nm to 1050 nm. Our technique uses a tunable laser as a source of illumination on a transmissive flat-field screen. We determine the full-aperture system throughput as a function of wavelength, including (in a single integral measurement) the mirror reflectivity, the transmission functions of the filters and the corrector optics, and the detector quantum efficiency, by comparing the light seen by each pixel in the CCD array to that measured by a precision-calibrated silicon photodiode. This method allows us to determine the relative throughput of the entire system as a function of wavelength, for each pixel in the instrument, without observations of celestial standards. We present promising initial results from this characterization of the PanSTARRS system, and we use synthetic photometry to assess the photometric perturbations due to throughput variation across the field of view.

Published: 2010.   Source: The Astrophysical Journal Supplement Series, 191:376–388, 2010 December

The Pan-STARRS1 Photometric System : Photometrical calibration of telescope

Related applications:  Metrology

Authors:  J. L. Tonry, C. W. Stubbs, K. R. Lykke, P. Doherty, I. S. Shivvers, W. S. Burgett, K. C. Chambers, K. W. Hodapp, N. Kaiser, R.-P. Kudritzki, E. A. Magnier, J. S. Morgan, P. A. Price, and R. J. Wainscoat

The Pan-STARRS1 survey is collecting multi-epoch, multi-color observations of the sky north of declination −30° to unprecedented depths. These data are being photometrically and astrometrically calibrated and will serve as a reference for many other purposes. In this paper, we present our determination of the Pan-STARRS1 photometric system: gP1, rP1, iP1, zP1, γP1, and ωP1. The Pan-STARRS1 photometric system is fundamentally based on the Hubble Space Telescope Calspec spectrophotometric observations, which in turn are fundamentally based on models of white dwarf atmospheres. We define the Pan-STARRS1 magnitude system and describe in detail our measurement of the system passbands, including both the instrumental sensitivity and atmospheric transmission functions. By-products, including transformations to other photometric systems, Galactic extinction, and stellar locus, are also provided. We close with a discussion of remaining systematic errors.

Published: 2012.   Source: The Astrophysical Journal, 750:99 (14pp), 2012 May 10

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