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High Power
CW Nd:YAG Laser
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for Laser
Cutting, Laser Welding, Laser Heat Treating and Laser Cladding
Applications
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Laser Configuration
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Laser Head
At the heart of the system is U.S.
Laser's unique laser head. The
laser head is a single lamp, single
ellipse, close-couples design, optimized for maximum pumping
efficiency. The design produces up to 700 watts with a
small diameter (6.3 mm) rod. The single lamp reduces
consumable costs, while the high efficiency reduces the energy
and cooling requirements as well.
The laser
head design allows for easy cascading of heads, in
a series periodic resonator. Single and two-head systems
are standard, and four-head systems are available.
An important feature of the
design is that it is tunable: the output power can be
smoothly varied from <20% to 100% of rated power without any
anomalies in the beam characteristics.
U.S. Laser can also provide high
brightness variants of the basic lasers, where the maximum
power has been slightly reduced to significantly improve the
beam quality.
Power Supply -
Cooling Console
The electronics and cooling system
are housed in a caster-mounted console. The closed loop
cooling system features a proportioning valve controller to
maintain constant head temperature, and a high efficiency heat
exchanger for connection to external cooling water/chiller.
The electronics include a high
efficiency power supply, and a control unit with status
monitoring and protection. All of these lasers may be
computer controlled via digital and analog inputs.
Optional IEEE 488/RS232/RS422 computer interface is
available.
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Optical Enclosure
The laser heads
are contained in an enclosure consisting of a tooling plate
base and a hinged, interlocked cover. An air
filtration system provides a clean, positive pressure,
environment for the optics, to protect against environmental
dust.
The enclosure
also includes optics to couple into the optical fiber, and a
combination beam dump shutter/absolute power meter.
Laser System Design
U.S. Laser's fiber optic beam
delivery system was designed specifically for the demands of
high power CW and Pulsed Nd:YAG lasers. Particular
attention was paid to power transmission, both to maximize
power-on-target, and to minimize any heating of the optical
system. All lens elements are fused silica, and are sized
based on the full numerical aperture of the fiber. All
surfaces (including the fiber ends) have anti-reflection
coatings. The result is a transmission of >96% through the
entire optical system.
Work Area Enclosure
U.S. Laser offers a variety of
standard and custom work area enclosures to complement the
high
power lasers. CDRH Class I and Class IV system are
available. The lasers can also be easily
integrated into existing CNC or robotic machines.
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Fiber Optic Beam Delivery
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Fiber Type
U.S. Laser offers both step index
and gradient index (GRIN) fibers. The step index fiber
produces a top-hat focused spot, whose size stays constant, even
when the output power is changed. The GRIN fiber produces
a parabolic profile, with a spot size smaller than a step index
fiber. The choice of fiber type is generally dictated by
the needs of the application.
Optional End Effectors
For specific applications,
additional accessories can be added to the basic end effector. For
laser welding, a coaxial gas nozzle
is available to provide an inert cover gas. The gas flow
is solenoid controlled, through the system computer.
For laser cutting, the gas nozzle design provides a high
velocity gas stream (either inert or assist gas).
For viewing, coaxial parfocal CCTV
system is available, for alignment and monitoring.
For beam sharing or splitting
requirements, a module is available to provide
either.
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Optics
The input optics include an
upcollimator and focusing lens (in a three-axis) adjustable
mount). The specific lenses are selected to maximize power
transmission and minimize beam quality degradation for the
specific laser configuration. U.S. Laser's standard end effector
is a two stage optical system, incorporating a collimating lens
and a focusing lens. The focusing lenses are easily
inter-changeable, for easy variation of spot size and working
distance.
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High Power
Multimode Lasers |
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Model # |
Max Output |
Beam Diameter |
Divergence |
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(watts) |
(mm) |
(mr) |
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404 |
150 |
6 |
12-14 |
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405 |
250 |
6 |
12-16 |
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Specifications:
Standard Laser Configurations |
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Model Performance |
406-1 |
408-1 |
406-2 |
408-2 |
408-4 |
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Maximum Output Power (watts) |
500
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600-700 |
1000 |
1200-1400 |
2500 |
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Recommended Operating Power (watts) |
100-400 |
100-500 |
200-800 |
200-1000 |
400-2000 |
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Beam Waist Diameter |
< 5
mm |
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Beam Divergence at Max. Power |
<
25 mr |
<
30 mr |
<
25 mr |
<
30 mr |
<
30 mr |
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Features |
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Number of Heads |
1 |
2 |
4 |
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Number of Lamps (total) |
1 |
2 |
4 |
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Expandability |
to
406-2 |
to
408-2 |
- |
to
408-4 |
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Computer Controllable |
yes |
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IEEE488/RS232/RS422 |
optional |
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Input Power Requirements |
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Voltage (3 phase, 50-60 Hz) |
208/230 V |
440/480 V |
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Power Consumption |
15
kw |
20kw |
30kw |
40kw |
80kw |
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Cooling Water Requirements |
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Temperature (°F) |
<55
°F |
<50
°F |
<50
°F |
<45
°F |
<45
°F |
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Flow |
6
gal/min |
10
gal/min |
12
gal/min |
24
gal/min |
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Pressure Differential |
40-60 psi |
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Dimensions |
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Optical Assembly (LxWxH) |
62"x18"x10.5" |
86"x19"x10.5" |
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Power Supply (WxDxH) |
22"x35"x38" |
30"x50"x60" |
(30"x50"x60")x2 |
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Standard Fiber Optic
Beam Delivery
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Performance
- Power
Transmission: >96% (up to 10 meter length)
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Focused Spot Size: down to 500 µm
Optical Fiber
- Fiber Type: Step or Gradient
Index
- Core Diameter: 600, 800, or 1000
µm
- Length: 2-100 meters
- Protection: Armored Jacket
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Output Optics (End
Effector)
- Mechanical Size: 1.5" diameter,
6" length
- Objective Lens Focal Length:
60-100 mm
- Protection: A.R. Coated Window
Options
- Gas Assist: Coaxial inert gas
(welding); High velocity (cutting)
- Viewing: Coaxial, Parfocal CCTV
- Beam Splitting/Sharing Module
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Lasers
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Laser Systems
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Sample Photos
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