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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] 

NL300 - Series

NL300 - Series, actively Q-switched Nd:YAG lasers, flashlamp pumped


The Nd:YAG laser of the NL300 series deliver up to 800mJ, 8 ns pulses with just a single oscillator stage without additional amplifier. The oscillator has a rugged sealed cavity which guarantees an excellent pulse energy and long term stability. Versions are available with repetition rates of 10, 20 Hz and 30 Hz.


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Bezeichnungen der Tabs

  • Description
  • Specifications
  • Harmonics & Attenuators
  • Pictures
Tab 1


  • Rugged sealed laser cavity
  • Up to 800 mJ pulse energy
  • Better than 1 % rms pulse energy stability
  • 10–30 Hz pulse repetitio rate pulse duration
  • Thermo stabilized second, third, fourth and fifth harmonics generator modules
  • Optional attenuators for fundamental and/or harmonics wavelengths
  • Water-to-water or water-to-air cooling options
  • Replacement of flashlamps without misalignment of laser cavity
  • Remote control via keypad and/or RS232/USB port


  • Material processing
  • OPO, Ti:Sapphire, dye laser pumping
  • Laser spectroscopy
  • Remote sensing

NL300 series electro-optically Q-switched nanosecond Nd:YAG lasers produce high energy pulses with 3 – 6 ns duration. Pulse repetition rate can be selected in range of 10 – 30 Hz. NL30×G models are optimized for OPO pumping that requires smooth beam profile without hot spots. NL30×HT models are designed for maximum energy extraction from the active element. Up to 800 mJ pulse energy can be produced at a 10 Hz pulse repetition rate.

A wide range of harmonic generator modules for generation up to a 5th harmonic is available. Harmonics generators can be combined with attenuators that allow smooth output energy adjustment without changing other laser parameters, i.e. pulse duration, pulse-to-pulse stability, divergence or beam profile. For a more detailed description of harmonic and attenuator modules please check our harmonic generators selection guide.

The extremely compact laser head is approximately 480 mm long and can be fitted into tight spaces. The laser power supply has a 330 × 490 mm footprint. Easy access to the water tank from the back side of the power supply facilitates laser maintenance. Replacement of flashlamp does not require removal of pump chamber from the laser cavity and does not lead to possible misalignment. The powering unit can be configured with water-to-water or water-to-air heat exchangers. The latter option allows for laser operation without the use of tap water for cooling. For customer convenience the laser can be controlled via a RS232 or USB port with LabView™ drivers (included) or a user-friendly remote control pad. Both options allow easy control of laser settings.

Tab 2
Specifications 1)

ModelNL301G 2)NL301HT
Pulse repetition rate 10 Hz 20 Hz 30 Hz 10 Hz 20 Hz 30 Hz
Pulse energy:
at 1064 nm 240 mJ 220 mJ 200 mJ 400 mJ 360 mJ 280 mJ
at 532 nm3) 100 mJ 90 mJ 70 mJ 180 mJ 160 mJ 120 mJ
at 355 nm4) 70 mJ 60 mJ 40 mJ 120 mJ 110 mJ 65 mJ
at 266 nm5) 25 mJ 20 mJ 15 mJ 40 mJ 35 mJ 25 mJ
at 213 nm6) 5 mJ 4 mJ 3 mJ 8 mJ 7 mJ 5 mJ
Pulse energy stability (Std. Dev.)7)
at 1064 nm 1 %
at 532 nm 1.5 %
at 355 nm 3 %
at 266 nm 3.5 %
at 213 nm 6 %
Power drift 8) 2 %
Pulse duration 9) 3-6 ns
Polarization at 1064 nm vertical, >90 %
Optical pulse jitter 10) < 0.5 ns rms
Linewidth at 1064 nm <1cm-1
Beam profile 11) "Hat-Top" in near and near Gaussian in far fields
Typical beam diameter 12) ~ 6 mm
Beam divergence 13) < 0.6 mrad
Beam pointing stability at 1064 nm 14) 50 µrad rms
Beam height 68 mm
Physical characteristics
Laser head size (WxLxH) 154x475x128 mm
Power supply unit (water cooled version) (WxLxH) 330x490x585 mm
Power supply unit (air cooled version) (WxLxH) 330 x 490 x 585 mm 550 x 600 x 680 mm 330 x 490 x 585 mm 550 x 600 x 680 mm
Harmonic generator unit sizes (WxLxH)15) 154x210x128 mm for H300SHC or H300STH units
154x160x128 mm for H300S or H300ST units
154x290x128 mm for H300FHC unit
Umbilical length 2.5 m
Operating requirements
Water consumption (max 20 °C) 16) < 6 l/min < 10 l/min < 6 l/min < 10 l/min
Room temperature 15-30 °C
Relative humidity 20-80 % (noncondensing)
Power requirements 17) 18) 208 or 240 V AC, single phase 50/60 Hz
Power consumption 19) < 1.8 kVA < 3.4 kVA < 1.8 kVA < 3.4 kVA

1) Due to continuous improvement, all specifications are subject to change without notice. For latest product information please visit EKSPLA. The parameters marked typical are not specifications. 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) NL301G and NL303G lasers have beam profile optimized for OPO pumping.

3) With H300SH, H300S or H300SHC harmonics generator modules. See harmonics generator selection guide for more detailed information.

4) With H300STH and H300ST harmonics generator modules. See harmonics generator selection guide for more detailed information.

5) With H300SH and H400FHC harmonics generator modules. See harmonics generator selection guide for more detailed information.

6) With H300FiHC harmonics generator module. See harmonics generator selection guide for more detailed information.

7) Averaged from 300 pulses.

8) Measured over an 8 hour period after a 10 min warm-up when ambient temperature variation is less than ± 2 °C.

9) FWHM measured with photodiode featuring 500 ps rise time and 300 MHz bandwidth oscilloscope.

10) Relative to SYNC OUT pulse.

11) Near field Gaussian fit is >70 %.

12) Beam diameter is measured at 1064 nm at the 1/e2 level.

13) Full angle measured at the 1/e2 level.

14) RMS value measured from 300 shots.

15) See harmonics generator selection guide on the page 68 for more detailed information.

16) For water cooled version. Air cooled version does not require tap water for cooling.

17) Power requirements should be specified when ordering.

18) 110 V AC powering is available, please inquire for details.

19) Required current rating can be calculated by dividing power value by mains voltage value.


  • Option - AW – air-cooled power supply option. An adequate air conditioner should be installed in order to keep room temperature stable.
  • Harmonics generator options – an extensive selection of harmonics generators up to 5th harmonics.
  • Attenuator options allow a smooth change of laser pulse energy, while other laser pulse parameters, such as pulse duration, jitter, pulse-to-puls stability, beam divergence and profile remain the same.


Tab 3

Harmonic generators

Nanosecond Q-switched lasers enable simple and cost effective laser wavelength conversion to shorter wavelengths through harmonics generation. EKSPLA offers a broad selection of wavelength conversion accessories for NL300 series lasers. The purpose of this guide is to help configure available harmonic generator and attenuator modules for NL300 series lasers for optimal performance.

The harmonics module uses a modular design that allows reconfiguration of laser output for the appropriate experiment wavelength.

A typical module houses a non-linear crystal together with a set of dichroic mirrors for separating the harmonic beam from the fundamental wavelength. Nonlinear crystals used for the purpose of wavelength conversion are kept at an elevated temperature in a thermo-stabilized oven.

Two or more modules can be joined together for higher harmonics generation: attaching one extra module to a second harmonic generator allows for the generation of 3rd or 4th harmonic wavelengths.

It should be noted that only modules with a single output port can be joined together: it is possible to attach a H300S module to a H300SH unit for 532 nm beam separation, or a H300FHC module for 4th harmonics generation (see detailed description below). Modules with two output ports (e.g., H300SHC) cannot be attached to extra units.

Mimetypes-application-pdf-iconHarmonische PDF



NL300 series lasers offer several options for changing output pulse energy. The easiest option is to change the timing of the Q-switch opening relative to the flashlamp pump pulse. This option is a standard feature for all NL300 series lasers. A change in Q-switch timing, however, changes other laser pulse parameters along with the pulse energy. A decrease in pulse energy results in longer pulse duration, decreased pulse-to-pulse-stability, and possible changes in the spatial beam profile. For applications that require smooth adjustment of output pulse energy while keeping other parameters stable, EKSPLA offers H300Ax series attenuator modules.


The following are suggested optimal configurations of H300 series modules for various output wavelengths:

1. For 2nd harmonics output only: the H300SHC module.

2. For 2nd and 3rd harmonics:
a) H300SH+H300S+H300THC – for SH and TH output as specified in the NL300 series brochure.
b) H300STH+H300ST – a cost-effective solution not requiring the replacement of modules when changing from a 532 nm to 355 nm beam and vice versa. The 532 nm beam specification will, however, be 15% lower relative to the values in the NL300 series brochure due to extra components in the beam path.

3. For 2nd and 4th harmonics: H300SH+H300S+H300FHC modules.

4. For all harmonics including 4th:
a) H300STH+H300ST+H300FHC – a cost-effective solution. The 266 nm and 532 nm beam specifications will be 15% lower relative to the values in the NL300 series brochure.
b) H300SH+H300S+H300THC+H300FHC – a slightly more expensive solution with output values adhering to those in the NL300 series brochure.

5. For all harmonics including 5th: modules described in paragraph #4 plus the H300FiHC module.

6. For attenuators for all wavelengths up to the 4th harmonic: H300SH+H300A2+H300TH+H300A3+H300A4 modules.

Mimetypes-application-pdf-iconAttenuator PDF


Tab 4

Tab 4 Inhalt

Tab 5
Bild 1
Beschreibung 1
NL300 series nanosecond Q-switched Nd:YAG lasers
Bild 2
Beschreibung 2
NL300 series nanosecond Q-switched Nd:YAG laser head outline drawing
Bild 3
Beschreibung 3
Typical outline drawing of H300SH series harmonics module for NL300 series laser
Bild 4
Beschreibung 4
Bild 5
Beschreibung 5
Bild 6
Beschreibung 6
Bild 7
Beschreibung 7
Bild 8
Beschreibung 8
Bild 9
Beschreibung 9
Bild 10
Beschreibung 10
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