Novanta v30, Руководство пользователя, Страница: 44 / 101

INTERNAL RF POWER SUPPLY PAGE | 44
gas seal and provide a flexible cushion that allows the slight movement necessary for alignment. All
optical elements are aligned and locked into place by factory technicians before the laser is shipped.
The output beam, roughly circular as it exits the resonator, transitions to a Gaussian-like mode in mid
and far fields—three meters (9.8 ft) and beyond. The internal structure and optics of the resonator
combine to produce a Gaussian-like mode quality (M2 factor) of < 1.2. As shown in the following figure,
beam waist diameter is 2.5 mm ±0.5 mm at the output aperture and full angle divergence due to dif-
fraction is less than 7 milliradians (a 7 mrad full angle divergence means that beam diameter increases 7
mm over every one-meter distance traveled).
Figure 3-1 v30 beam characteristics
Internal RF power supply
OEM v30 lasers are driven by a compact radio frequency (RF) oscillator mounted in the laser chassis.
The 30 VDC input voltage is converted into a high-power RF signal using an RF power oscillator. The
output from the RF oscillator (nominally at 83.5 MHz) drives the laser directly by exciting carbon dioxide
(CO2) gas in the tube to produce lasing.
Control circuit
Sensors built into the OEM v30 control board monitor the laser for conditions like under/over voltage,
over temperature, and other faults that pose a risk of damage to the laser. Additionally, laser operation is
controlled by a Laser Enable input.
Caution: Possible Equipment Damage
Because of their smaller beam diameter, v30 lasers have significantly higher power densities than
previous NOVANTA lasers. This means that even a small amount of contamination on the laser’s out-
put window (or on any optic in the beam path) can absorb enough energy to damage the optic.
Inspect the output window and other beam delivery optics periodically for signs of contaminants and
carefully clean as required. In dirty environments, purge laser optics using filtered air or nitrogen to
prevent vapor and debris from accumulating on optical surfaces.