30
| Operation
|
Ultra
Version M 22-April-2012
11.0 External Modes (EXT)
WARNING:
For GRM Laser Heads, Quantel configures the Pulse
Repetition Frequency (PRF) at the optimum rate specified by the
customer.
For a GRM laser in External Mode, the PRF must be equal to the
initial setting (within ±10%). For stable resonator Laser Heads in
External Mode, the PRF is variable to the maximum of the factory
setting. Refer to your
for your system
.
This sheet was shipped with your system.
Note:
The rising edge of the input trigger pulse is the active edge. For
low jitter operation, the rise time must be as fast as possible (much
less than 1µsec.)
To maintain a fast rise time and therefore minimal jitter, the
Q-Switch input is not optically isolated and does not have
protection circuitry.
WARNING:
Do not apply voltages greater than 5V to prevent
damage to sensitive components.
For External flashlamp and Q-Switch synchronization, the applied trigger
signals must exhibit the required characteristics as shown in the diagram.
The delay between flashlamp and Q-Switch synchronization signals
may range up to 500µs. In order to optimize laser operation (maximum
energy), this delay must be measured and adjusted.
Figure 18
Required Characteristics–Flashlamp
and Q-Switch Trigger Input Signals
T
R
V
IH
V
IL
0 V
T
W
V
IH
V
PK
Symbol Parameter
Min.
Max. Unit
VIL
Input low voltage
0.0
0.8
V
VIH
Input high voltage
3.0
5.0
V
TR
Rise time
1
µs
TW
Pulse width
100
µs
VPK
Peak voltage
5.5
V
