Download Spitfire - Spectra

Controls, Indicators and Connections
It provides a way to fire the input Pockels cell based on sync signals from
two circuits: the pump laser Q-switch signal and the seed laser pulse train.
SYNC ERROR indicator—when on and the SDG II is in synchronized
mode, indicates the sync signal is absent or the seed laser is not modelocked.
BWD (PD1, PD2 and RESET)—see “Bandwidth Detector” on page 4-6.
MODE control—selects CONTINUOUS repetition rate firing (based on input
trigger) or SINGLE SHOT firing (the corresponding LED turns on)
MAN TRIG control—causes the three output triggers to fire a single pulse
when the firing mode is set to SINGLE SHOT and the button is pressed.
ENABLE controls (3)—turn the three adjustable output trigger signals on
and off. If a signal is enabled, its corresponding LED is illuminated. When
disabled, only that output is deactivated; the other outputs remain active.
OUT 1 DELAY display, control and connector—the display shows the
selected delay (0 to 1275 ns) between the pump laser Q-switch sync signal
and the time the input Pockels cell is turned on to capture the current seed
pulse in the Spitfire amplifier.
The control knob adjusts the delay in 250 ps increments, or 10 ns increments if the knob is pushed in during adjustment. The corresponding BNC
connector connects to the Spitfire’s HSD 1 TRIG BNC connector. This provides a low-voltage sync signal to the high-voltage driver, which turns on
the input Pockels cell to capture the current seed pulse.
OUT 2 DELAY display, control and connector—the display shows the
selected delay (0 to 1275 ns) between the pump laser Q-switch sync signal
and the time the output Pockels cell is turned on to eject the amplified pulse
into the compressor. This delay must be greater than the setting for
OUT 1 DELAY.
The control knob adjusts the delay in 250 ps increments, or 10 ns increments if the knob is pushed in during adjustment. The corresponding BNC
connector connects to the Spitfire’s HSD 2 TRIG BNC connector. This provides a low-voltage sync signal to the high-voltage driver, which turns on
the output Pockels cell to eject the amplified pulse.
SYNC OUT DELAY display, control and connector—the display shows the
selected delay (0 to 1275 ns) between the time the output Pockels cell is
fired and the time the user can send a trigger signal to a device (such as an
oscilloscope) that is part of the target apparatus.
The control knob adjusts the delay in 250 ps increments, or 10 ns increments if the knob is pushed in during adjustment. The corresponding BNC
connector connects to the user’s oscilloscope for monitoring pulses, or to
other apparatus of the target or data acquisition system.
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