NL230 series

High Energy Q-switched DPSS Nd:YAG Lasers
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  • Compact high energy and repletion rate nanosecond lasers
  • Up to 190 mJ energy
  • Up to 100 Hz repetition rate
  • Large set of harmonics modules and attenuators
  • Compact high energy and repletion rate nanosecond lasers
  • Up to 190 mJ energy
  • Up to 100 Hz repetition rate
  • Large set of harmonics modules and attenuators

Features & Applications

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

Description

The NL230 series diode-pumped Q-switched 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

ModelNL230-30NL230-100NL231-50NL231-100
Main specifications 1)
Pulse energy (not less than) 2)
    at 1064 nm 140 mJ60 mJ190 mJ150 mJ
    at 532 nm 3)70 mJ30 mJ90 mJ70 mJ
    at 355 nm 4)40 mJ15 mJ55 mJ40 mJ
Pulse energy stability (StdDev) 5)
    at 1064 nm <1 %
    at 532 nm<2.5 %
    at 355 nm<3.5 %
Pulse repetition rate30 Hz100 Hz50 Hz100 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
Polarizationlinear, >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 time5 min
Physical characteristics
Laser head size (W × L × H)190×305×165 mm ± 3 mm
Power supply unit (W × L × H)
    Desktop case471×391×147 mm ± 3 mm
    19" module483×355×133 mm ± 3 mm
    External chiller (where applicable)inquire
Umbilical length2.5 m
Operating requirements
Cooling (air cooled)14) built in chillerexternal chiller
Ambient temperature18 – 27 °C
Relative humidity (non-condensing)20 – 80 %
Power requirements100-240 VAC, single phase, 50/60 Hz
Power consumption<1kVA

 

1) Due to continuous improvement, all specifications are subject to change without notice. The parameters marked typical may 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.

 

Notes: The laser and auxiliary units must be settled in such a place void of dust and aerosols. It is advisable to operate the laser in air conditioned room, provided that the laser is placed at a distance from air conditioning outlets. The laser should be positioned on a solid worktable. Access from one side should be ensured. Intensive sources of vibration should be avoided near the laboratory (ex. railway station or similar).

Harmonic generators & attenuators

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 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 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. 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.
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 specified above due to extra components in the beam path.

3. For attenuators for all wavelengths up to the 3th harmonic: H300A1+H300SH+H300A2+H300TH+H300A3 modules.

Harmonic generators and attenuators selection guide can be downloaded from this link.

Performance & Drawings

Ordering information

Ordering information of NL230 lasers

Ordering information of NL230 lasers

Send request about NL230