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NL230 series Nanosecond Q-switched DPSS Nd:YAG Lasers

The NL230 series diode-pumped nanosecond Q-switched lasers produce up to 50 mJ at 100 Hz or up to 150 mJ at 50 Hz pulse repetition rate. Diode pumping allows maintenance-free laser operation for an extended period of time (more than 3 years for an estimated eight working hours per day). The typical pump diode lifetime is more than 1 billion shots.

Features

  • Diode-pumped, typical diode lifetime >1 Gshot
  • Rugged sealed laser cavity
  • Up to 190 mJ at 1064 nm pulse energy
  • Up to 100 Hz pulse repetition rate
  • Short pulse duration in the 3-7 ns range
  • Variable reflectivity output coupler for low-divergence beam
  • Quiet operation: no more flashlamp firing sound
  • Air cooled
  • Remote control via keypad and/or PC via USB (RS232 optional) port with supplied LabVIEW™ drivers
  • Optional temperature-stabilized second, third and fourth harmonic generators
  • Optional attenuators for fundamental or/and harmonics wavelengths

Applications

  • OPO, Ti:Sapphire and dye laser pumping
  • TFT-LCD Repair
  • Mass Spectroscopy
  • Remote Sensing
  • LIDAR (Light Detection And Ranging)
  • LIF (Light Induced Fluorescence)
  • PIV (Particle Image Velocimetry)
  • LIBS (Light Induced Breakdown Spectroscopy)
  • ESPI (Electronic Speckle Pattern Interferometry)
  • Medical
  • Photo-acoustic imaging

 

The NL230 series diode-pumped Q-switched nanosecond lasers produce up to 150 mJ at 100 Hz or up to
190 mJ at 50 Hz pulse repetition rate. Diode pumping allows maintenance-free laser operation for an extended period of time (more than 3 years for an estimated eight working hours per day). The typical pump diode lifetime is more than 1 billion shots.
Lasers are designed to produce high-intensity, high-brightness pulses and are targeted for applications such as material ablation, remote sensing, OPO, Ti:Sapphire or dye laser pumping. Due to an electro‑optical Q-switch, the master oscillator generates short duration pulses in the 3 – 7 ns range. The oscillator cavity optical design features a variable‑reflectivity output coupler, giving a low-divergence laser beam.
A closed-loop TEC based chiller is used for laser cooling, eliminating the need for external cooling water and reducing running costs. Angle-tuned non-linear crystals mounted in temperature stabilized heaters are used for optional second, third or fourth harmonic generation. The harmonics separation system is designed to ensure radiation with a high spectral purity and to direct it to the separate output ports.
For customer convenience the laser can be controlled via a user‑friendly remote control pad or a USB interface. The remote pad allows easy control of all parameters and features a backlit display that is easy to read even through laser safety eyewear. Alternatively, the laser can be controlled from a personal computer via supplied Windows™ compatible software. LabVIEW™ drivers are also included with each laser installation package.

Specifications ¹⁾

Model NL230-30 NL230-100 NL231-50 NL231-100
Pulse energy (not less than) 2)
at 1064 nm 140 mJ 60 mJ 190 mJ 150 mJ
at 532 nm 3) 70 mJ 30 mJ 90 mJ 70 mJ
at 355 nm 4) 40 mJ 15 mJ 55 mJ 40 mJ
Pulse energy stability (StdDev) 5)
at 1064 nm <1 %
at 532 nm <2.5 %
at 355 nm <3.5 %
Pulse repetition rate 30 Hz 100 Hz 50 Hz 100 Hz
Power drift 6) < ±1 %
Pulse duration 7) 3-7 ns
Linewidth <1 cm-1 at 1064 nm
Beam profile 8) "Top Hat" in near field and close to Gaussian in far field
Beam divergence 9) <0.8 mrad
Beam pointing stability 10) ≤60 µrad rms
Polarization linear, >95% at 1064 nm
Typical beam diameter 11) 5 mm
Optical pulse jitter
Internal triggering regime 12) <0.5 ns rms
External triggering regime 13) <0.5 ns rms
SYNC OUT pulse delay -100 µs...100 ms
Typical warm-up time 5 min
PHYSICAL CHARACTERISTICS
Laser head size (W x L x H) 190 x 305 x 165 mm ± 3 mm
Power supply unit (W x L x H)
Desktop case 471 x 391 x 147 mm ± 3 mm
19" module 483 x 355 x 133 mm ± 3 mm
External chiller (where applicable) inquire
Umbilical length 2.5 m
OPERATING REQUIREMENTS
Cooling (air cooled) 14) built in chiller external chiller
Ambient temperature 18-27 °C
Relative humidity (non-condensing) 20-80 %
Power requirements 100-240 V AC, single phase, 50/60 Hz
Power consumption <1 kVA

1) Due to continuous improvement, all specifications are subject to change without notice. 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) Outputs are not simultaneous. Inquire for fourth 266 nm and fifth 213 nm harmonic specifications.
3) With H300SH and H300S or H300SHC harmonics generator module. See harmonics generator selection guide for more detailed information.
4) With H300STH and H300ST harmonics or H300SH and H300THC generator modules. See harmonics generator selection guide for more detailed information.
5) Averaged from pulses, emitted during 30 sec time interval.
6) Measured over 8 hours period after 20 min warm-up when ambient temperature variation is less than ± 2 °C.
7) FWHM.
8) Near field (at the output aperture) TOP HAT fit is >80 %
9) Full angle measured at the 1/e² level.
10) Beam pointing stability is evaluated as movement of the beam centroid in the focal plane of a focusing element.
11) Beam diameter is measured at 1064 nm at the 1/e² level.
12) With respect to SYNC OUT pulse.
13) With respect to QSW IN pulse.
14) Adequate room air conditioning should be provided.

Ordering information of NL230 lasers

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 NL230  series lasers. The purpose of this guide is to help configure  available harmonic generator and attenuator modules for  NL230 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  4 th 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.

Attenuators

NL230 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 NL230 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.

 

Selecting the right module

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 NL230 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 NL230 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 NL230 series brochure.
b) H300SH+H300S+H300THC+H300FHC – a slightly more expensive solution with output values adhering to those in the NL230 series brochure.

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

 

Harmonic Generators and Attenuators selection guide can be downloaded from this link.