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TOPAG Lasertechnik GmbH
Nieder-Ramstädter Str. 247
64285 Darmstadt
Telefon: +49 6151 4259 78
Telefax: +49 6151 4259 88 
E- mail: info [at] topag.de 

NL740 - Serie

1025
Ultrastabiler Nanosekundenlaser NL740

NL300D

Der abstimmbare Nanosekundenlaser der Serie NL740 zeichnet sich durch eine sehr stabile Ausgangsleistung von bis zu 100mJ bei Repetitionsraten von 100Hz und Pulsdauern zwischen 3-10ns aus. Aufgrund der exzellenten Strahl- und Pulsenergiestabilität eignet sich das System für Anwendungen in der Messtechnik und für das Pumpen von Farbstofflasern.

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Bezeichnungen der Tabs

  • Beschreibung
  • Spezifikationen
  • Bilder
Tab 1

Features

  • Excellent temporal and spatial output mode stability
  • Up to 100 mJ output energy
  • Up to 100 Hz repetition rate
  • 2 – 10 ns pulse duration
  • 1064, 532 nm or 355 nm output wavelength
  • Fibre front end output amplified in diode pumped regenerative amplifier

Applications

  • Metrology
  • Front end for power amplifiers
  • Ti: Sapphire pumping
  • Laser peening – material hardening by laser-induced shock wave
  • Plasma and shock physics

The main feature of the NL740 series is the output of ultra-stable tunable duration (2 – 10 ns) narrow bandwidth nanosecond pulses based on temporally driven CW diode laser seeder and amplification stages.

Start of the system is the single mode DFB laser with temporal output power modulator. Then, light is amplified in a diode pumped regenerative amplifier in order to reach energy sufficient to amplify in double pass diode pumped amplifiers. The power amplifier is a chain of double pass amplifiers where the pulse is amplified up to the required energy. Before amplification spatial beam shaping is employed in order to get flat top shape at the output. The harmonic generators are based on angle tuned nonlinear crystals placed in a heater.

Tab 2
Specifications 1)

ModelNL740NL742
Pulse energy (rectangular pulse in time domain 5 ns FWHM)
at 1064 nm 2 mJ 100 mJ
at 532 nm 2) NA 50 mJ
at 355 nm 2) NA 30 mJ
Pulse energy stability (Std.Dev) 3)
at 1064 nm <0.5 %
at 532 nm <1 %
at 355 nm <1.5 %
Power drift 4) ±2 %
Pulse duration 5) 3-10 ns
Repetition rate 100 Hz
Polarization at 1064 nm vertical, >98 %
Optical pulse jitter 6) <150 ps
Linewidth <0.1 cm-1
Beam profile Gaussian "Hat-Top"
Typical beam diameter 7) ~2 mm ~5 mm
Beam divergence 8) 1 mrad 0.7 mrad
Beam pointing stability ± 25 µrad
Physical characteristics 
Laser head size (WxLxH)  456x1031x249 mm 600x1200x330 mm
Power supply unit size (WxLxH) 85x170x41 mm 520x500x210 mm
 Umbilical length  2.5 m (other length on request)
Operating requirements
Water consumption (max 20° C) air-cooled air-cooled / <4 l/min
Ambient temperature stabilized, from range 18-25 °C
Relative humidity 20-80 % (non-condensing)
Power requirements9) 90 – 240 V AC, single phase 50/60 Hz
Power consumption  <200 W <1.5 kW

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 1064 nm.

2) Harmonics outputs are not simultaneous; only single wavelength beam is present at the output at once. Manual reconfiguration is required to switch wavelength.

3) Standard deviation value averaged from pulses, emitted during 30 sec time interval 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) FWHM. 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.

8) Full angle measured at the 1/e² level at 1064 nm.

9) Mains voltage should be specified when ordering.

Tab 3

Tab 3 Inhalt

Tab 4

Tab 4 Inhalt

Tab 5
Bild 1
 NL740
Beschreibung 1
NL740 series ultra-stable nanosecond laser
Bild 2
 NL949 near field
Beschreibung 2
Typical NL740 near field beam profile at 532 nm
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Located in: bis 100 Hz