The GSI/Lumonics VM2000 (left) compared with a pair of Cambridge 6800
scanners (right). The VM2000 mount was NOT machined by GSI/Lumonics but is
Click here for an enlarged view.
he company formerly known as General
Scanning has come out with a new scanner. Pangolin briefly tested this
scanner, and here is our report.
The GSI/Lumonics model VM2000 is a new scanner designed for larger beam
applications (e.g., fiber-fed, YAGs). Depending on the mirrors installed,
you can use an aperture from 7mm up to 15mm. The larger the mirrors, the
larger the aperture, and the slower the scanner.
ccording to GSI/Lumonics, the VM2000
should run at ILDA 30K speeds with a 9.5 mm Y mirror (thus, an aperture of
about 9 mm). This is based on a specified bandwidth of 2.5 kHz and a
small-step time of less than 300 microseconds.
tested the VM2000 with the largest 15mm mirrors. We found it could
reproduce the ILDA Test Pattern at 24,000 pts/sec (24K), at a 2 degree
scan angle. This is a pretty small angle, so a scan speed of 18K would be
more reasonable for these large mirrors.
The VM2000 was able to
reproduce the Laser Media test pattern correctly at 18K, at an 18 degree
scan angle. This is not directly comparable to the ILDA Test Pattern, but
it does give a point of comparison.
he scanner itself is 1.8 inches in diameter
and about 3 inches in length. This is very large compared with
"graphics" scanners such as the GSI/Lumonics G-120 or Cambridge
model 6800 or 6210 scanners. Of course, this is because the VM2000 is
designed to move much larger beams.
The body of the scanner is
bright chrome. We are not sure why, since it seems that a stray laser beam
reflecting off the chrome would be more troublesome than if the beam hit a
This page last updated:
Tuesday, June 19, 2007 08:50:53 PM