A Pockels cell controlled by a circuit according to the invention can be used to select closely spaced pulse pairs at high repetition rate e. Without making reference to the state-of-the-art H-configuration the driver according to the invention can be described as follows: The Pockels cell driver according to the invention avoids the problem of residual voltage ocross the Pockels cell during the recharging phase, it can also operate at higher repetition rates of kHz, whereas conventional drivers are only capable of running at 50 kHz. During or after the recharging phase switch S 2 B is closed again. Since this method allows fewer passes through the amplifying medium, these amplifiers are mainly used when pulse energy is low or when very high amplification is desired. HV via a second resistance R2 ; and wherein the first node J1 is connected to the second node J2 via a series circuit comprising a third resistance R3 and an inductance L1. These Pockels cells must first be switched on in the time span between two such laser pulses which are emitted by the laser source at a spacing of typically 6 to 15 nanoseconds, and switched off again after letting one laser pulse through only 6 to 15 nanoseconds later.

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Dqf pockels cell driver for qswitching for flashlamp pumped lasers dqf is designed for qswitching of nanosecond flashlamp pumped lasers without use of phase retardation plate.

Both the first and second electric potentials can be given by either the pole of a voltage source or ground. Keep it simple dont use too many different parameters. A regenerative amplifier is known to have an amplifying medium placed within a resonator. This invention relates to a driver or electrical high voltage control for a Pockels cell and application of a Pockels cell controlled with said driver in a laser system and applications of said laser systems.

Thorald Horst Bergmann, Ralf Knappe. Closing switch S 1 will apply a voltage to the Pocels cell. Using such a driver with a Pockels cell pulses can be selected in laser systems more efficiently.

However, the time between closing and reopening a high voltage switch can not be arbitrarily small, resulting in a minimum time that voltage must be applied to the Pockels cell. In the following description this configuration will be designated as H-configuration.


Thorald Horst Bergmann Inventions, Patents and Patent Applications – Justia Patents Search

For instance this allows alternating pulses with different properties. By principle this method of mode coupling will always produce the pulses at very high repetition rates greater than 10 MHz, typically from 70 to MHz for solid state lasers and low energy of the individual laser pulses nanajoules, typically 0.

The characterizing features of the invention are given in the independent claims. Driver circuit for driving of electro-optical elements, particularly pockel cells, has compensation circuit that is attached at H-bridge in order to stabilize dropping voltage at element, where compensation circuit has auxiliary condenser. A driver circuit for a pockels cell, comprising a first line, which is to be connected to a first terminal of the pockels cell, and a second line, which is to be connected to a second terminal of the pockels cell, wherein one or both of the first line and the second line hashave an inductance l1, l2, in particular an inductance l1, l2 or.

The mode of operation of this state-of-the-art circuit is shown in FIG.

Arbitrary combinations of the previously discussed applications and arrangements of Pockels cell controlled by devices according to the invention can be though of within laser systems as shown in FIG.

This driver enables precise onoff control of the pockels cell lockels crystals impact 10, and is able to. Thus, in order to couple a laser pulse into the amplifier, pockele is mandatory to switch on the voltage to be applied to the Pockels cell in only a few nanoseconds.

This switch can either replace the usually used recharging resistors R 2 or can be placed to these in parallel. Static phase mask for high-order spectral phase control in a hybrid chirped pulse amplifier system. Just bergmajn well, as described in FIGS.

Our pockels cell drivers custombuilt by bergmann messgerate include single or double pushpull switches whosemaximal repetition ratesareashighas10and bergmanj.

Driver for Pockels cells and using this Pockels cell within laser systems The driver i. These Pockels cells must first be switched on in the time span between two such laser pulses which are emitted by the laser source at a spacing of typically 6 to 15 nanoseconds, and switched off again after letting one laser pulse through only 6 to 15 nanoseconds later.


Details of the necessary control circuits need not be discussed here, as these circuits can easily be fabricated with state-of-the-art methods. Pulse train generator and method for opckels a repeating sequence of laser pulses.

Bergmann pockels cell driver

Typical repetition rates of less than 20 kHz are too low for laser materials processing systems using Pockels cells within the laser system to be economically effective. In combination with a polarizing element, changing the high voltage applied to the Pockels cell will change the Q of the resonator within one turn-around time.

Separate search groups with parentheses and booleans. Furthermore, it is the object of the invention to provide applications of these Pockels cells in laser systems generating short or ultrashort laser pulses with high energy and minimal background radiation, and to provide applications of these laser systems.

The time shifter box shown at the top of this page actually has four such delay circuits, two of them could be used to modify the timing in a pockels cell driver using a pushpull high voltage switch, four would be neccessary to have time control over all trigger signals in a pockels cell driver based on a bridge circuit. Pockels cell driver circuit comprising resistive, inductive or capacitive elements.

Optical waveform measurement by optical sampling with a mode-locked laser diode. It passes a mechanical shutter, a pockels cell, and the ir detector detection of beam intensity, all of which enable control of the laser power and its administration duration.

The current of the individual MOSFETS, and hence the chain, can be controlled by means of adding a current measuring resistance into the source path of the transistors and transmitting the voltage arising there via a capacitor to a gate connector of the transistors. The capacitors CS 1 and CS 2connected in parallel to the switches S 1 and S 2 show their intrinsic switch capacitances.