NL300 Series - Flash Lamp Pumped, Actively Q-switched Nd:YAG Lasers

The Nd:YAG laser of the NL300 series deliver up to 1200mJ, 6 ns pulses with a single oscillator stage without additional amplifier. The oscillator has a rugged sealed cavity which guarantees an excellent pulse energy and long term stability. Different versions are available with repetition rates of 5, 10 and 20 Hz.

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Features

  • Rugged sealed laser cavity
  • Up to 1200 mJ pulse energy
  • Better than 1 % StDev pulse energy stability
  • 5–20 Hz pulse repetition rate
  • 3–6 ns 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

Applications

  • 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 5 – 20 Hz.

NL30×HT models are designed for maximum energy extraction from the active element. Up to 1200 mJ pulse energy can be produced at a 5 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 remote control pad. Both options allow easy control of laser settings.

Model 1) NL303HT NL305HT
Pulse energy
    at 1064 nm 800 mJ 700 mJ 1200 mJ 1100 mJ
    at 532 nm 2) 380 mJ 320 mJ 700 mJ 500 mJ
    at 355 nm 3) 250 mJ 210 mJ 450 mJ 320 mJ
    at 266 nm 4) 80 mJ 60 mJ 120 mJ 100 mJ
    at 213 nm 5) 13 mJ 10 mJ 25 mJ 20 mJ
Pulse duration 6) 3 - 6 ns
Repetition rate 10 Hz 20 Hz 5 Hz 10 Hz
Beam profile 7) Top Hat in near field, close to Gaussian in far field
Linewidth < 0.5 cm-1 at 1064 nm
Pulse energy stability (StdDev) 8)
    at 1064 nm < 1.0 %
    at 532 nm < 1.5 %
    at 355 nm < 3.0 %
    at 266 nm < 3.5 %
    at 213 nm < 6.0 %

 

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 and for basic system without options.

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

3) With H300THC, H300STH and H300ST harmonics generator modules. See harmonics generator selection guide for more detailed information.

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

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

6) FWHM.

7) Near field (at the output aperture) TOP HAT fit is >70%.

8) Averaged from pulses, emitted during 30 sec time interval.

 

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-pulse stability, beam divergence and profile remain the same.

 

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.

 

Attenuators

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.

 

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 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.

 

For more details, please check the harmonic generators and attenuators selection guide in the NL300 datasheet.

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TOPAG Lasertechnik GmbH
Nieder-Ramstädter Str. 247
64285 Darmstadt, Germany
Phone: +49 6151 4259 78
Fax: +49 6151 4259 88
E-mail: info@topag.de