Tsunami - Beckman Institute Laser Resource Center

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Lok-to-Clock Electronics
Model 2080
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PZT
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Tsunami " A
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Mode1 3930 - REF OUT
Photodiode
Input
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80 MHz
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PZT
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Model 3930
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REF IN
Photodiode
Input
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Length Adjustw !
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Filter Lens I
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Photodiode Nonlinear
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Oscilloscope Calibration : c:
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Etalon ;
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Photodiode Sample Lens
Figure 8-6: Synchronization of two Lok-to-Clock Tsunami Lasers
To overlap the pulses more precisely in time, focus the two Tsunami
output beams in a nonlinear crystal such as BBO." As you sweep the
phase-matching angle of the BBO crystal, a frequency-doubled signal
should be observed from each laser. Set the crystal for an intermediate
angle to observe the sum frequency mixed signal from both lasers. By
activating the sweep generator, the crystal can be easily phase-matched
for observation of this sum frequency mixed signal. It will be modulated
at the 10 Hz sweep period. Once the sum frequency mixed signal
is observed, deactivate the sweep generator and use the coarse1
fine TIMING controls to optimize this signal.
* The nonlinear crystal must be cut such that it canfrequency-double the output of each
lasel: Verifi this by temporarily placing a white card at the output of the crystal and
then changing the phase-matching angle of the crystal while watching the laser output
on the card.