Operation
29
• “Q-Switch Sync Out” – A 5 volt, 10 microsecond pulse. A positive
transition from 0 volts to +5 volts occurs when the Q-switch is
energized. The laser pulse will exit the laser head approximately 130
nanoseconds after this signal.
• “Q-switch Source”:
“INT” – The Q-switch will fire after the default Q-switch delay. The
Q-switch delay is started after a flashlamp fire signal a) has been
input into the “Flashlamp Fire” BNC or b) the front panel trigger
control is set to “1 Shot”, “Fixed” or “Variable,” and the Fire button
has been pressed.
“EXT” – The Q-switch will fire at a user defined time when a pulse
is input to the “Q-switch Trigger” BNC. NOTE: Pulse energy and
pulse stability will vary depending upon the timing between the “Fire
Laser” signal and the “Fire Q-SW” signal. Refer to Figure 4-3, the
timing diagram for the optimum setting for the highest pulse energy
and the best pulse to pulse stability.
• “Flashlamp Source”:
“INT” – The flashlamp will be fired by the control electronics at the
repetition rate set through the control panel.
“EXT” – The flashlamp will be fired at a user defined time. The
flashlamp will fire after receiving the trigger from the “Flashlamp
Trigger” BNC.
Internal triggering is the simplest way to run the Tempest Nd: YAG
laser. The control electronics provide the necessary triggers to fire the
laser. The flashlamp and Q-switch toggle switches should both be up, in
the INT position. The repetition rate and energy can be changed by the
controls on the control panel.
The trigger selector switch determines the operating mode, 1 shot,
continuous or variable. In 1 shot mode, the laser is fired once each time
the Fire button on the control panel is pressed. In fixed mode, the laser
fires at the maximum repetition rate of the laser. In Variable mode, the
laser fires at the repetition rate set by the control knob, shown in the
LED display. In Fixed and Variable modes the laser begins firing when
the Fire button on the control panel is pressed.
Two output signals are available to synchronize the Tempest and the
user’s setup. The relationship between the synchronization pulses and
the laser pulse are shown below in Figure 4-3.
Internal Triggering
To Next Page
Loading...