Rf Power Supply; Figure 4-1 V40 Beam Characteristics - Novanta v40 User Manual

RF POWER SUPPLY

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.
Because of their smaller beam diameter, v40 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.
The output beam, roughly circular as it exits the resonator, transitions to Gaussian-like in mid and far
fields three meters and beyond. The internal structure and optics of the resonator combine to produce a
Gaussian-like mode quality of TEM00 with an M2 factor < 1.2. As shown in the following figure, beam
waist diameter is 2.5 mm at the output aperture and full angle divergence due to diffraction is less than 7
milliradians (a 7 mrad full angle divergence means that beam diameter increases 7 mm over every one-
meter distance traveled).
RF power supply
A compact, self-contained RF power supply mounted internally in the laser chassis converts 30 VDC
input power into a radio frequency (RF) signal using a crystal-controlled oscillator. The 81.36 MHz RF
output from the oscillator is then amplified to obtain approximately 400 watts of RF power. From the
amplifier, RF power is routed to the electrode structure in the laser tube where it excites carbon dioxide
(CO2) gas in the tube to produce lasing.
Control circuit
Control circuitry built into the laser interrupts operation if any critical parameter is violated. Switches and
sensors on the control board monitor various conditions and parameters that, if exceeded, pose a risk of
potential damage to the laser. Additionally, laser operation is interrupted in response to the following
conditions: (1) the manual Shutter Switch is closed; (2) the Shutter Open Request input signal is missing;
(3) an over temperature condition occurs; (4) the coolant flow rate is too low; (5) the Remote
Reset/Start Request signal is enabled; or (6) the Remote Interlock signal is missing.
Caution: Possible Equipment Damage

Figure 4-1 v40 beam characteristics

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