NT240 Series - Tunable, Diode-Pumped Nanosecond Lasers

Integrated in a single compact housing a diode-pumped Q-switched laser and OPO system offers a tuning range from 210 nm to 2600 nm and a linewidth of < 5 cm-1. Additionally, the single wavelengths of the diode-pumped pump laser (1064 / 532 / 355 nm) are accessible. The NT240 series offers a repetition rate of 1 kHz and pulses with energy of up to 450 µJ and duration of 3 - 6 ns.

Description 

Features

  • Customers recognized reliability
  • 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

* Automatic wavelength scan is optional

Applications

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

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

Option Features
-SH Tuning range extension in UV range (210 – 300 nm) by second harmonics generation
-SF Tuning range extension in 300 – 405 nm range by sum-frequency generation
-SH/-SF Tuning range extension in 210 – 405 nm range by combining second harmonics and sum-frequency generator outputs for maximum possible pulse energy
-SCU Spectral filtering accessory for improved spectral purity of pulses
-H, -2H, -3H 1064, 532 and 355 nm output via separate port
-FC Fiber coupler
-Attn Attenuator option
Specifications 
Model 1) NT242 NT242-SH NT242-SF NT242-SH/SF
Wavelength range
    Signal 405 – 710 nm
    Idler 710 – 2600 nm
    SH and SF - 210 – 300 nm 300 – 405 nm 210 - 405 nm
Pulse energy 2)
    OPO 450 µJ
    SH and SF - 40 µJ at 230 nm 60 µJ at 320 nm
Pulse duration 3) 3 - 6 ns
Repetition rate 1000 Hz
Linewidth 4) < 5 cm-1

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.

 

Applications 

Kranabetter, L. et al. (2019) Considerable matrix shift in the electronic transitions of helium-solvated cesium dimer cation Cs2He +n. Physical Chemistry Chemical Physics, Vol. 21, No. 45

Group: Prof. M. Beyer, University of Innsbruck

Laser: NT240

Abstract

We investigate the photodissociation of helium-solvated cesium dimer cations using action spectroscopy and quantum chemical calculations. The spectrum of Cs2He+ shows three distinct absorption bands into both bound and dissociative states. Upon solvation with further helium atoms, considerable shifts of the absorption bands are observed, exceeding 0.1 eV (850 cm−1) already for Cs2He10+, along with significant broadening. The shifts are highly sensitive to the character of the excited state. Our calculations show that helium atoms adsorb on the ends of Cs2+. The shifts are particularly pronounced if the excited state orbitals extend to the area occupied by the helium atoms. In this case, Pauli repulsion leads to a deformation of the excited state orbitals, resulting in the observed blue shift of the transition. Since the position of the weakly bound helium atoms is ill defined, Pauli repulsion also explains the broadening.

Full Publication

 

 

Rampp, M. et al. (2018) Time-resolved infrared studies of the unfolding of a light triggered β-hairpin peptide. Chemical Physics, Vol. 512, p. 116-121

Group: Prof. W. Zinth, University of Munich

Laser: NT240

Abstract

The light triggered unfolding reaction of the azobenzene peptide AzoTrpZip2 is investigated from 1 ps to 100 µs. Absorption changes show that the unfolding is a multistep process with the initial breaking of the hydrogen bonds in the vicinity of the AMPP chromophore on the 1 ns time scale followed by the disappearance of the remaining interstrand hydrogen bonds of the native hairpin structure with a 1.9 µs process. Subsequently, the hydrophobic core structure still stabilising a hairpin-like pattern rearranges in a 17 µs process. The strong slowing down of this reaction at lower temperature points to a barrier height in the range of 60 kJ/mol.

Full Publication

Documents 
Inquiry 
Do you have questions about NT240?
Your details will be gathered and handled to respond to your request.
Detailed information on this topic can be retrieved from our privacy policy.
  • Description
  • Specifications
  • Pictures
  • Applications
  • Documents
  • Inquiry

Features

  • Customers recognized reliability
  • 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

* Automatic wavelength scan is optional

Applications

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

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

Option Features
-SH Tuning range extension in UV range (210 – 300 nm) by second harmonics generation
-SF Tuning range extension in 300 – 405 nm range by sum-frequency generation
-SH/-SF Tuning range extension in 210 – 405 nm range by combining second harmonics and sum-frequency generator outputs for maximum possible pulse energy
-SCU Spectral filtering accessory for improved spectral purity of pulses
-H, -2H, -3H 1064, 532 and 355 nm output via separate port
-FC Fiber coupler
-Attn Attenuator option
Model 1) NT242 NT242-SH NT242-SF NT242-SH/SF
Wavelength range
Signal 405 – 710 nm
Idler 710 – 2600 nm
SH and SF - 210 – 300 nm 300 – 405 nm 210 - 405 nm
Pulse energy 2)
OPO 450 µJ
SH and SF - 40 µJ at 230 nm 60 µJ at 320 nm
Pulse duration 3) 3 - 6 ns
Repetition rate 1000 Hz
Linewidth 4) < 5 cm-1

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.

Kranabetter, L. et al. (2019) Considerable matrix shift in the electronic transitions of helium-solvated cesium dimer cation Cs2He +n. Physical Chemistry Chemical Physics, Vol. 21, No. 45

Group: Prof. M. Beyer, University of Innsbruck

Laser: NT240

Abstract

We investigate the photodissociation of helium-solvated cesium dimer cations using action spectroscopy and quantum chemical calculations. The spectrum of Cs2He+ shows three distinct absorption bands into both bound and dissociative states. Upon solvation with further helium atoms, considerable shifts of the absorption bands are observed, exceeding 0.1 eV (850 cm−1) already for Cs2He10+, along with significant broadening. The shifts are highly sensitive to the character of the excited state. Our calculations show that helium atoms adsorb on the ends of Cs2+. The shifts are particularly pronounced if the excited state orbitals extend to the area occupied by the helium atoms. In this case, Pauli repulsion leads to a deformation of the excited state orbitals, resulting in the observed blue shift of the transition. Since the position of the weakly bound helium atoms is ill defined, Pauli repulsion also explains the broadening.

Full Publication

 

 

Rampp, M. et al. (2018) Time-resolved infrared studies of the unfolding of a light triggered β-hairpin peptide. Chemical Physics, Vol. 512, p. 116-121

Group: Prof. W. Zinth, University of Munich

Laser: NT240

Abstract

The light triggered unfolding reaction of the azobenzene peptide AzoTrpZip2 is investigated from 1 ps to 100 µs. Absorption changes show that the unfolding is a multistep process with the initial breaking of the hydrogen bonds in the vicinity of the AMPP chromophore on the 1 ns time scale followed by the disappearance of the remaining interstrand hydrogen bonds of the native hairpin structure with a 1.9 µs process. Subsequently, the hydrophobic core structure still stabilising a hairpin-like pattern rearranges in a 17 µs process. The strong slowing down of this reaction at lower temperature points to a barrier height in the range of 60 kJ/mol.

Full Publication

Do you have questions about NT240?
Your details will be gathered and handled to respond to your request.
Detailed information on this topic can be retrieved from our privacy policy.

Do you have questions about our products?

Write to us | info@topag.de

Give us a call | +49 6151 42944 0

TOPAG Lasertechnik GmbH
Nieder-Ramstädter Str. 247
64285 Darmstadt, Germany
Phone: +49 6151 42944 0
Fax: +49 6151 42944 11
E-mail: info@topag.de