|문의||김길석박사, 하윤미과장 (02-3461-1103)|
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 mJpulse 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.
|MAIN SPECIFICATIONS 1)|
|Pulse repetition rate||10 Hz||20 Hz||5 Hz||10 Hz|
|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 energy stability (Std. Dev.) 6)|
|at 1064 nm||1 %|
|at 532 nm||1.5 %|
|at 355 nm||3 %|
|at 266 nm||3.5 %|
|at 213 nm||6 %|
|Power drift 7)||±2 %|
|Pulse duration 8)||3 – 6 ns|
|Polarization||vertical, >90 %||vertical, >90 %||vertical, >65 %|
|Optical pulse jitter 9)||< 0.5 ns rms|
|Beam profile 10)||"Hat-Top" in near and near Gaussian in far fields|
|Typical beam diameter 11)||~ 8 mm||~ 10 mm|
|Beam divergence 12)||< 0.6 mrad|
|Beam pointing stability 13)||50 µrad rms|
|Beam height||68 mm|
|Laser head size (W × L × H) 14)||154 × 475 × 128 mm|
|Power supply unit (W × L × H)||330 × 490 × 585 mm|
|Umbilical length||2.5 m|
|Water consumption (max 20 °C) 15)||< 8 l/min||< 12 l/min||< 6 l/min||< 10 l/min|
|Room temperature||15–30 °C|
|Relative humidity||20–80 % (non-condensing)|
|Power requirements 16) 17)||208–240 V AC, single phase 50/60 Hz|
|Power consumption 18)||< 1 kVA||< 1.5 kVA||< 1 kVA||< 1.5 kVA|
Note: Laser must be connected to the mains electricity all the time. If there will be no mains electricity for longer that 1 hour then laser (system) needs warm up for a few hours before switching on.
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.
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.
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.