NT230 series

High Energy Broadly Tunable DPSS Lasers
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  • Integrated OPO system
  • Diode pumped
  • Ultrabroad tuning range from 192 to 2600 nm
  • Up to 15 mJ in VIS, more than 1.8 mJ in UV
  • At 100 Hz pulse repetition rate
  • Integrated OPO system
  • Diode pumped
  • Ultrabroad tuning range from 192 to 2600 nm
  • Up to 15 mJ in VIS, more than 1.8 mJ in UV
  • At 100 Hz pulse repetition rate

Features & Applications

Features

  • Integrates DPSS pump laser and OPO into a single housing
  • Hands-free no-gap wavelength tuning from 192 to 2600 nm
  • High, up to 15 mJ pulse energy from OPO
  • 100 Hz pulse repetition rate
  • More than 1.8 mJ output pulse energy in UV
  • Less than 5 cm⁻¹ linewidth
  • 2 – 5 ns pulse duration
  • Remote control via key pad or PC
  • Optional separate output port for 532/1064 nm beam

Applications

  • Laser-induced fluorescence
  • Flash photolysis
  • Photobiology
  • Remote sensing
  • Metrology
  • Non-linear spectroscopy

BENEFITS

  • The system is widely tunable; 192 – 2600 nm and delivers high pulse energy (up to 15 mJ) which allows investigation of an extensive range of materials
  • High repetition rate (up to 100 Hz) and output power enable fast data collection and intensive excitation of materials
  • 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
  • Diode pumping reduces maintenance frequency
  • 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 NT230 systems into various experimental environments

Description & Options

NT230 series lasers deliver high up to 9 mJ energy pulses at 100 Hz pulse repetition rate, tunable over a broad spectral range. Integrated into a single compact housing, the diode pumped Q-switched Nd:YAG laser and Optical Paramteric Oscillator (OPO) offers hands‑free, no-gap tuning from 192 to 2600 nm. With its 100 Hz repetition rate, the NT230 series laser establishes itself as a versatile tool for many laboratory applications, as laser induced fluorescence, flash photolysis, photobiology, metrology, remote sensing, etc.

Due to the innovative diode‑pumped design, NT230 series lasers feature maintenance-free laser operation for an extended period of time and improved stability (compared with flash-lamp pumped counterparts).

NT230 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 system display that is easy to read even with laser safety eyewear.

Due to DPSS pump source, the laser requires little maintenance. It is cooled by a water-air chiller, which further reduces running costs. An OPO pump energy monitor allows monitoring of pump laser performance. A standard feature includes a separate output port for the 355 nm pump beam.

Accessories and optional items

OptionFeatures
-SHTuning range extension in UV range (210 – 405 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
-DUVDeep UV option in 192 – 210 nm
-H, -2H1064 nm or 532 nm output via separate port
-FCFiber coupled output in 350 – 2000 nm range
-Attn/FCFiber coupled attenuator
-SCUSpectral filtering accessory for improved spectral purity of pulses

Specifications

Model 1)NT230-50NT230-100
OPO
Wavelength range
    Signal405 – 710 nm
    Idler710 – 2600 nm
    SH and SF210 – 405 nm 2)
    DUV192 – 210 nm
Pulse energy 3)
    OPO15 mJ9 mJ
    SH and SF 4)1.8 mJ1.3 mJ
    DUV0.25 mJ0.15 mJ
Pulse repetition rate 50 Hz100 Hz
Pulse duration 5)2 – 5 ns
Linewidth 6) < 5 cm-1
Tuning resolution 7)
    Signal 1 cm-1
    Idler1 cm-1
    SH/SF/DUV2 cm-1
Polarization
    Signalhorizontal
    Idlervertical
    SH/SFhorizontal
    DUVvertical
OPO beam divergence 8)< 2 mrad
Typical beam diameter 9)4 mm
PUMP LASER
Pump wavelength 10)355 nm
Typical pump pulse energy 11)50 mJ35 mJ
Pulse duration 6)4 – 6 ns at 1064 nm
PHYSICAL CHARACTERISTICS
Unit size (W × L × H)451 × 696 × 172 mm
Power supply size (W × L × H)471 × 391 × 147 mm
External chillerinquire
Umbilical length2.5 m
OPERATING REQUIREMENTS
Coolingexternal chiller
Room temperature18 – 27 °C
Relative humidity20 – 80 % (non-condensing)
Power requirements100 – 240 VAC, single phase, 50/60 Hz
Power consumption < 1 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. Separate –SH and –SF options are available.
  3. See tuning curves for typical outputs at other wavelengths.
  4. Measured at 260 nm wavelength.
  5. FWHM measured with photodiode featuring 1 ns rise time and 300 MHz bandwidth oscilloscope.
  6. Linewidth is <8 cm⁻¹ for 210 – 405 nm range.
  7. When wavelength is controlled 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, SF and DUV.
  8. Full angle measured at the FWHM level at 450 nm.
  9. Beam diameter is measured at 450 nm at the 1/e<sup>2</sup> level and can vary depending on the pump pulse energy.
  10. Separate output port for the 3rd harmonic beam is standard. Output ports for other harmonic are optional.
  11. The pump laser pulse energy will be optimized for best OPO performance and 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

Publications

Found total :
7 articles, 7 selected
Application selected :
All Applications
All Applications
Scientific Applications
Photolysis – breaking down of a chemical compound by photons
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

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)

Hybrid Photoacoustic/Ultrasound tomograph for real time finger imaging

Related applications:  Photoacoustic Imaging Biomedical

Authors:  M. Oeri, W. Bost, N. Sénégond, S. Tretbar, M. Fournelle

We report a target-enclosing, hybrid tomograph with a total of 768 elements based on capacitive micromachined ultrasound transducer technology and providing fast, high-resolution 2-D/3-D photoacoustic and ultrasound tomography tailored to finger imaging.A freely programmable ultrasound beamforming platform sampling data at 80 MHz was developed to realize plane wave transmission under multiple angles. A multiplexing unit enables the connection and control of a large number of elements. Fast image reconstruction is provided by GPU processing. The tomograph is composed of four independent and fully automated movable arc-shaped transducers, allowing imaging of all three finger joints. The system benefits from photoacoustics, yielding high optical contrast and enabling visualization of finger vascularization, and ultrasound provides morphologic information on joints and surrounding tissue. A diode-pumped, Q-switched Nd:YAG laser and an optical parametric oscillator are used to broaden the spectrum of emitted wavelengths to provide multispectral imaging. Custom-made optical fiber bundles enable illumination of the region of interest in the plane of acoustic detection. Precision in positioning of the probe in motion is ensured by use of a motor-driven guide slide. The current position of the probe is encoded by the stage and used to relate ultrasound and photoacoustic signals to the corresponding region of interest of the suspicious finger joint. The system is characterized in phantoms and a healthy human finger in vivo. The results obtained promise to provide new opportunities in finger diagnostics and establish photoacoustic/ultrasoundtomography in medical routine.

Published: 2017.   Source: Ultrasound in Med. & Biol., 2017

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