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Quantum Instruments Cascade Laser Starter Kit Manual de usuario Pagina 57

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Starter Kit Instruction Manual Appendix 56
10.1.3 Specifications
Bias frequency . . . . . . . . . . . . . . . . Up to 100 Hz
Achievable shift . . . . . . . . . . . . . . . . . . . . . . . . 0.1%
Input voltage U
in
. . . . . . . . . . . . . . . . . . .0 to 3 V
Input voltage threshold. . . . . . . . . . . . . . . . 0.6 V
Input frequency F
in
. . . . . . . . . . . . . . 0 to 1 k Hz
Input impe dance Z
in
. . . . . . . . . . . . . . . . . . 100Ω
Output U
mon
max . . . . . . . . . . . . . . . . . . . . . 2.5 V
Output imp e dance Z
mon
. . . . . . . . . . . . . . . 10 Ω
Ratio U
mon
/I
b
. . . . . . . . . . . . . . . . . . . 10mV/mA
10.1.4 Utilisation
The current into the sink must not e xceed too much
a value given by the laser specifications as follows:
• The largest allowed peak current of the laser
from the LI- curves, multiplied by the respec-
tive duty cycle gives the upper limit of the
mean laser current.
I
max
= I
pmax∗d
• The sum of the Bias current (I
b
) a nd the ac tu-
ally applied mean la ser current (I
p∗d
) should
be limited by the upper limit of the mean laser
current.
I
b
+ I
p∗d
≤ I
pmax∗d
• The Bias-T itself has a limit at:
U
mon
= 2.5V or
U
in
= 3V
Note: If higher voltages are applied, excessive
heating of the Bias-T may occur and destroy the
laser.
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