Customized NL941 Models

High Energy Temporaly Shaped DPSS Nanosecond Lasers
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  • High energy nanosecond lasers
  • Temporaly shaped 5 – 50 ns pulses
  • Pulse energies up to 2 J
  • 100 Hz pulse repetition rate
  • High energy nanosecond lasers
  • Temporaly shaped 5 – 50 ns pulses
  • Pulse energies up to 2 J
  • 100 Hz pulse repetition rate

Models Features

NL941 Features

  • Up to 2 J at 1064 nm output pulse energy
  • Bursts of up to 30 pulses at 1 kHz repetition rate or 4 pulses at 20 kHz repetition rate in 20 sec periods available in burst mode
  • 5 ns pulse duration
  • Spatial flat top beam profile
  • Temporal shaping by pulse processing with electrooptical modulator driven by arbitrary wave generator (AWG)
  • High efficiency diode pumping chambers
  • 1×2 m laser head footprint

NL942-SH Features

  • Two outputs up to 1.7 J at 1064 nm each
  • Two outputs up to 0.9 J at 532 nm each
  • 100 Hz repetition rate
  • 50 ns pulse duration
  • Spatial flat top beam profile
  • Temporal shaping by pulse processing with electrooptical modulator driven by arbitrary wave generator (AWG)
  • Internal system diagnostics
  • High efficiency diode pumping chambers
  • Industrial grade, portable laser housing with integrated power supplies and cooling unit

Description

NL941 and NL942-SH lasers were designed and manufactured according custom request and are used for plasma research. They are good examples of what can be achieved when long time experience and latest technologies are put together.

Main laser feature is output of temporaly shaped pulses based on electrooptical modulator driven by programable arbitrary wave generator (AWG). Pulse shaping resolution is 125 ps and pulse duration up to 50 ns. Start of the system is a single mode CW laser. Then light is amplified in fiber amplifier, later AWG driven modulator transmits only required temporal shape and duration pulse which is amplified in diode pumped regenerative amplifier in order to reach energy level sufficient to amplify in single-pass / double-pass diode pumped amplifiers. Diode pumping enables generating bursts of pulses with up to 20 kHz frequency in burst mode.

Power amplifier is a chain of diode pumped single-pass amplifiers where pulse is amplified up to required energy. During amplification spatial beam shaping is employed in order to get a flat top shape at the output. Optional second and third harmonic generators are based on angle tuned nonlinear crystals placed in heaters.

Specifications

ModelNL941NL942-SH
MAIN SPECIFICATIONS 1)
Pulse energy
    at 1064 nm2000 mJ2 × 1700 mJ
    at 532 nm 2) 2 × 900 mJ
Pulse energy stability (StdDev): 3)
    at 1064 nm1.0 %
    at 532 nm2.0 %
Power drift 4)± 2 %
Pulse duration 5)5 ns50 ns
Repetition ratebursts of 20 kHz every 20 s100 Hz
Polarization at 1064 nmvertical, > 90 %
Optical pulse jitter 6) < 30 ps
Linewidth < 1 cm-1
Beam profile Hat-Top (at laser output), without diffraction rings
Typical beam diameter 7) ~12 mm ~10 mm
Beam divergence 8) < 0.5 mrad
Beam pointing stability± 50 µrad
PHYSICAL CHARACTERISTICS
Laser head (W × L × H)1000 × 2000 × 400 mm1000 × 2000 × 1800 mm
Power supply unit (W × L × H)550 × 600 × 500 mm
Umbilical length3 m
OPERATING REQUIREMENTS
Facility water consumption (max 20° C)8 l/min 20 l/min
Ambient temperature 22 ± 2 °C
Relative humidity 20 – 80 % (non-condensing)
Power requirements 9)208/240 V AC, single phase 50/60 Hz
or 220, 380 or 400 V AC, three phases 50/60 Hz
208, 380 or 400 V AC,
three phase, 50/60 Hz
Power consumption 2.0 kW9.4 kW
  1. Due to continuous improvement, all specifications subject to change without notice. Parameters marked typical may vary with each unit we manufacture.Unless stated otherwise, all specifications are measured at 1064 nm and for basic system without options.
  2. For NL94X-SH harmonic generator option. Harmonic outputs are not simultaneous; only single wavelength beam is present at the output at once.
  3. Standard deviation value averaged over 30 s after 20 minutes of warm-up.
  4. Deviation from average value measured over 8 hours of operation when room temperature variation is less than ±2 °C.
  5. Measured with photodiode with 100 ps rise time and oscilloscope with 600 MHz bandwidth.
  6. Standard deviation value, measured with respect to triggering pulse.
  7. Beam diameter is measured at 1064 nm at laser output at the 1/e² level and can vary with each unit we manufacture.
  8. Full angle measured at the 1/e² level at 1064 nm.
  9. Mains voltage should be specified when ordering.

Performance

Publications

Found total :
2 articles, 2 selected
Application selected :
All Applications
All Applications
Scientific Applications
High Intensity Sources – laser produced plasma, x-ray source
Thomson Scattering – elastic scattering of electromagnetic radiation by a free charged particle

Characterization and calibration of the Thomson scattering diagnostic suite for the C-2W field-reversed configuration experiment

Related applications:  High Intensity Sources Thomson Scattering

Authors:  A. Ottaviano, T. M. Schindler, K. Zhai, E. Parke, E. Granstedt, M. C. Thompson and the TAE Team

The new C-2W Thomson scattering (TS) diagnostic consists of two individual subsystems for monitoring electron temperature (Te) and density (ne): one system in the central region is currently operational, and the second system is being commissioned to monitor the open field line region. Validating the performance of the TS’s custom designed system components and unique calibration of the detection system and diagnostic as a whole is crucial to obtaining high precision Te and ne profiles of C-2W’s plasma. The major components include a diode-pumped Nd:YAG laser which produces 35 pulses at up to 20 kHz, uniquely designed collection lenses with a fast numerical aperture, and uniquely designed polychromators with filters sets to optimize a Te ranging from 10 eV to 2 keV. This paper describes the design principles and techniques used to characterize the main components of the TS diagnostic on C-2W, as well as the results of Rayleigh scattering calibrations performed for the whole system response.

Published: 2018.   Source: Review of Scientific Instruments 89, 10C120 (2018)

Thomson scattering systems on C-2W field-reversed configuration plasma experiment

Related applications:  High Intensity Sources Thomson Scattering

Authors:  K. Zhai, T. Schindler, A. Ottaviano, H. Zhang, D. Fallah, J. Wells, E. Parke, M. C. Thompson and the TAE Team

TAE Technologies’ newly constructed C-2W experiment aims to improve the ion and electron temperature in a sustained field-reversed configuration plasma. A suite of Thomson scattering systems has been designed and constructed for electron temperature and density profile measurements. The systems are designed for electron densities of 1×1012 cm-3 to 2×1014 cm-3 and temperature ranges from 10 eV to 2 keV. The central system will provide profile measurements of Te and ne at 16 radial locations from r = -9 cm to r = 64 cm with a temporal resolution of 20 kHz for 4 pulses or 1 kHz for 30 pulses. The jet system will provide profile measurements of Te and ne at 5 radial locations in the open field region from r = -5 cm to r = 15 cm with a temporal resolution of 100 Hz. The central system and its components have been characterized, calibrated, installed and commissioned. A maximum-likelihood algorithm has been applied for data processing and analysis.

Published: 2018.   Source: Review of Scientific Instruments 89, 10C118 (2018)

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