22 product focus: lenses, optics, and coatings
Better focus
Warren Clark rounds up the
1064nm, 532nm and 355nm or CO lasers feature laser damage thresholds up to 5J/cm
2
2
operating at 10.6µm. @10ns for pulsed operation or 1MW/cm
2
for
latest launches in lenses, In scanning systems incorporating CW operation.
optics and coatings
galvanometers, the laser beam may propagate Elliot Scientific (www.elliotscientific.
at varying angles relative to the optical axis, com) has launched its own range of low-
causing distortion. F-Theta scanning lenses cost high-quality glass filters for research
Among the new are designed to provide a flat field at the and industry. Several product groups will be
products on the image plane and add specific amount of available, including: neutral density (both
market in lenses, negative barrel distortion so that the travel absorptive and reflective) filters; dichroic
optics and coatings distance is directly proportional to the scan colour filters; and pass filters (long, short
are F-Theta angle. and band), manufactured from Schott glass.
Scanning Lenses Edmund’s Nd:YAG F-Theta Lenses feature The filters come in 0.5-inch and one-inch
from Edmund multiple elements with high transmission diameters, as well as two-inch squares.
Optics (www.edmundoptics.com). V-coating, providing excellent throughput JDSU (www.jdsu.com) has recently
Commonly used in laser marking, engraving, with minimum heat build-up improving both introduced an ultraviolet (UV) filter, which
and cutting systems, these lenses are designed performance and durability. An industry- allows for a transmission level that is up
to provide a flat field at the image plane of the standard M85 threading on all lenses allows to four times higher than many other UV
scanning system. F-Theta lenses are optimised for easy mounting and simple retrofitting of filters available. It is also more durable and
for use with Nd:YAG lasers operating at OEM systems. Nd:YAG F-Theta Lenses also environmentally stable than current solutions,
om
ooptics.c
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EOfeb09 pp22-23 Lenses.indd 22 17/2/09 16:50:37
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