QBU-mini Pockels cell drivers

Pockels cell drivers of QBU-mini-series are several Pockels cell driver circuit boards that differ with output voltage range (up to 4.0 kV bipolar), see also How to order? section. Please, note that by bipolar device an output pulse voltage U is formed by applying +U/2 to positive output wire and –U/2 to negative.

QBU-mini-series is specially designed to control Pockels cells by applying a fast switching high voltage. The modules require +24 V DC power supply and pulse generator to set an operating frequency and pulse width. An output voltage level can be programmed in working range by user either manually (through onboard configuration trimpot) or remotely (applying a DC voltage to the respective pin).

Triggering by an external low voltage arbitrary TTL signal allows modules to work in next scenarios:

• push-up (= normally off scheme), when a base voltage level equals to zero
• pull-down (= normally on scheme), when pulses from base bias voltage to ground are generated
• user-defined scheme, with arbitrary width and frequency of pulses.



Pockels cell drivers of QBU-mini-series are based on MOSFET technology and offer high repetition rates and fast transition time (< 15 ns) for both pulse edges.

Performance

For instance, QBU-3012 in continuous mode without any additional cooling and running with proper load (11‑7 pF) has typical performance as below:

Output voltage, kV

Repetition rate, kHz (*)

1.5

35

2.0

23

2.5

15

3.0

10

(*) The values are approximate, exact performance depends on actual load capacitance and cooling conditions.

Kept cool enough with forced air cooling, at low load capacitance and low operating voltage modules may achieve much higher performance in continuous mode or even twice more in burst mode. At the full load (3.5 kV, 11 pF) repetition rate is higher than 8 kHz.

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