Pockels Cell DriversG&H Pockels cell drivers have been developed to complement our range of Pockels Cells. High quality components are integrated into our designs to maximize lifetime, safety, and reliability. Our Pockels cell drivers include the Q Series Q-switch drivers and R-series regenerative amplifier drivers. Q-switch drivers provide a fast rise time followed by a longer decay time. Regenerative amplifier drivers have a square pulse with a fast rise and fall time, adjustable pulse width and may be operated to 100 kHz or more. The Q series product line includes the Q-Drive, OEM Q-Drive, and QDP models while the R series product line includes the R200, the R200 System, the HVR, and the HVR System.
When selecting a Pockels cell driver, it is important to know the required switching voltage, as it is typically higher for BBO than KD*P, and half-wave operation requires twice the voltage of quarter-wave.
Q-Drive™ for Q-switched lasersG&H’s signature Pockels cell driver, the Q-Drive™, was developed with a differential output eliminating high DC voltages relative to ground at the Pockels cell. The Q-Drive™ insulation stress and stray capacitance effects are minimized while maximizing safety and reliability. The Q-Drive™ series offers a fast rise-time for KD*P Pockels cells used in Q-switched lasers with modest repetition rates. It has been designed for high noise immunity and optimum signal integrity. The Q-Drive™ is available in laboratory and OEM configurations. The QDP-drive produces a double-pulse waveform that holds off lasing during flash lamp operation and pulses the Pockels cell at peak gain inversion– when laser output is at maximum – then applies voltage again to turn the Pockels cell off and prevent additional laser pulses from being emitted. The design was conceived to minimize the time that the Pockels cell is exposed to high differential voltages and eliminate electrochemical degradation of the crystal, extending its useful life.
R-DRIVES FOR REGENERATIVE AMPLIFIERSThe compact, cost-effective R200™ is designed specifically for use with BBO Pockels cells at quarter wave voltage. Offering both a fast rise and fall time, it allows laser pulses to be injected into or coupled out of an amplifier cavity quickly. Ideal for pulse selection and ultrafast laser regenerative amplifier designs up to 2.5kV at 200 kHz, it can be incorporated into new systems or retrofitted as an upgrade to existing designs. It is also available as a turnkey solution in a 19” rack, called the R200™ System. The HVR-Drive™ is an extension of the R200™ product family with voltage capability up to 7.5 kV at repetition rates of up to 200 kHz. The fast rising and falling edges of its top-hat waveform makes the HVR appropriate for use with BBO Pockels cells operating in ultrafast regenerative amplifiers, as well as with KD*P Pockels cells and most BBO Pockels cells at half-wave voltage. The HVR-System™ is a turnkey, front-panel controlled, rack-mounted Pockels cell driver system capable of operation to 7.5 kV and 200 kHz repetition rate. The HVR-System™ includes a driver, power supplies, and control electronics – enabling out of the box functionality for prototyping and laboratory based studies over a range of operational regimes. It also features a front panel digital voltmeter, high voltage enable/disable and trigger on/off switches for ease of use. G&H offers a number of standard HVR-System™ configurations and custom configurations for specific requirements.
OEM CUSTOMIZATIONG&H Pockels cell drivers may be customized for each application, from wiring and signal interfaces to cooling by air, water, or conduction/convection. Options for enhanced reliability include complex voltage traces for the Q-Drive™ to avoid crystal degradation, and custom triggering logic with precisely controlled delays for the R100™ MOSFETs to prevent damage in operation. All OEM designs are built to the desired form factor and mounting requirements.
APPLICATIONS OF POCKELS CELLS DRIVERSQ-switching, regenerative amplifiers, laser pulse selection and management.
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