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SPi vFinal DR 2/9/09 15:44 Page 18
MANUFACTURINGCHOICES
high power CW lasers. 200 µm thick mono or
polycrystalline silicon can be cut at speeds of over
10m/min with kerf widths down to 40 µm.
Cut surfaces are parallel, clean, oxide free and
largely crack free (image of laser cutting). This
process is also able to cut wafers as thick as 1.2
mm at speeds of 1 m/min and 0.65 mm wafers in
excess 5 m/min.
Issue IV 2009
Pulsed fibre lasers are also capable of fine hole
drilling as used in EWT style cells where tens of
thousands of holes are drilled in arrays to provide myriad of materials. In some instances the lasers Above Left:
through the cell connectivity. Blind holes or provide multifunctional capabilities being used for Layer removal on
grooves can also be effectively machined and in more than one application. Molybdenum
these applications the ability to tune the pulse
characteristics can significantly impact processing CW fibre laser are also finding applications in the Above Right:
-pv-management.com aspects such as minimisation of debris generation. solar industry and are used for applications such Cutting of 250 µm
as soldering of busbars, where precise control of silicon ribbon
.solar
Marking is an important industrial process often heat input is required. The versatility of laser
www
overlooked, but traceability requirements mean energy as a manufacturing tool is unrivalled and as
that more and more components are being such will have a successful future. As solar
18
marked. Pulsed fibre lasers are a natural choice technologies continue to evolve so will the fibre
providing a flexible tool capable of marking a lasers used to manufacture them.
Power+Control
400W Welding Laser
Unique M
2
=4 beam profile
The R4 series of 25-400W single mode fiber lasers from SPI is now
complemented by a low moded welding laser improving weld process
capability by widening weld profiles, bridging fit up issues and
improving control and repeatability on spot welds. For superior butt,
seam or spot welding of fine electronic, battery or medical
components request a trial on www.spilasers.com/TBYB.
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