Some aspects of the invention feature a controllable Pockels cell system that allows for a particularly fast amplitude variation of laser pulses. In all these cases, a comparatively long opening time of the Pockels cell is necessary or desirable in order to be able to achieve a desired final gain. This improves upon some known Pockels cell systems by providing means for modifying the switching time when the high voltage is applied to the Pockels cell. Surface potential distribution measuring device and surface potential distribution measuring method. These two elements Pockels cell and analyzer together form the electro-optical modulator. For example, the voltage pulse can be shifted by the analog signal 15 so that the laser pulse coincides with the falling edge of the voltage pulse.
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The laser oscillator 38 can be protected by an extra optical diode, and the repetition rate of pulses coming from the laser oscillator 38 can be reduced with an extra pulse picker, as described in German Application No.
Pockels Cell Drivers
Driver for Pockels cell and using this Pockels cell within laser systems. Optical modulators include both electro-optical modulators and acousto-optical modulators. The transmission versus time function of the electro-optical modulator can have a rising edge and a falling edge that can both be used for setting the intensity amplitude of the transmitted laser pulses.
By way of example, in the case Yb: As their main element, common electro-optical modulators use a Pockels cell with variable optical properties, podkels an element sensitive to the polarization direction of the light beam, such as a reflective analyzer with constant optical properties. The system of claim 2, wherein the push-pull circuit comprises a first switch connected to both a first potential and a node, and a second switch connected to both a second potential and the node; wherein the delay unit is connected to both the first and second switch of the push-pull circuit; and wherein the Pockels cell is connectable to ;ockels node and to the second potential.
The time delays are controlled by an analog signal 15which is applied to the delay unit According to an aspect the present disclosure relates to an improved driver circuit for a Pockels cell, in particular to such a driver circuit with which the voltage present at the Pockels cell can be manipulated.
Pockels Cell Drivers | Gooch & Housego
Pockels cell driver circuit for rapidly varying the pulse amplitude of short or ultrashort laser pulses. Pockel accompanying drawings are provided to ensure a further understanding of embodiments and are integrated into the present description and form part thereof.
The rising and falling edges of the voltage pulse can be shifted in opposite directions, effectively changing the maximum amplitude of the triangular voltage pulse, thus modifying the transmission of a laser pulse through an analyzer. The time delay of control signal from the first delay unit is controlled by a povkels analog signal applied to the first delay unit, and the time delay of control signals from the second delay unit is controlled by a second analog signal, applied to the second delay unit.
Mode-locked laser pulses usually have high repetition rates above 1 MHz, typically from 40 MHz to MHz, for solid state lasers, and low pulse energies in the order of nanojoules, typically from 0. In order to achieve a very small focal point, deflection and focusing of the laser beam is done with a single optical element.
USA1 – Controlling pockels cells – Google Patents
Method and apparatus for controlling and protecting pulsed high power fiber amplifier systems. Ideal for pulse selection and ultrafast laser pokcels amplifier designs up to 2. This node is connected to a second potential, such as a ground terminal, via a second switch.
Thus it is possible to individually control the amplitude of selected laser pulses. Mode-locked laser pulses usually have high cfll rates above 1 MHz, typically from 40 MHz to MHz, for solid state lasers, and low pulse energies in the order of nanojoules, typically from 0.
CROSS REFERENCE TO RELATED APPLICATION
The analog signal 15 controlling the time delay generated by the delay unit 13 can be changed very rapidly, thus allowing different time delays from one laser pulse to the next laser pulse of the pulse train, allowing one to control and vary the amplitude of each individual laser pulse selected by the Pockels cell The Pockels cell can also be connected to the second potential.
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CW pumper CW pumped variable repetition rate regenerative laser amplifier system. That means that the opening time of the Pockels cell should be greater than ns, in particular greater than ns, in particular greater than ns, in particular greater than ns, in particular greater than ns. Such an electrical control can efficiently select individual laser pulses, allowing the precise generation of pulse sequences with defined time intervals for certain applications.
Q-switch drivers provide a fast rise time followed by a longer decay time. The driving of this driver circuit takes place in such a way that firstly both switching units S 1 and S 2 are open.
This electro-optical modulator can be placed within or outside of the laser resonator. The edges of the voltage pulses applied to the Pockels cell 22 can be shifted in time, or the voltage pulse applied to the Pockels cell 22 can be shifted as a whole. In order to assign the fragment ions to their respective parent ions, some ion selecting mechanism such as an ion gate must be used to preselect one specific mass of the primary ion spectrum.
The Pockels cell 22 is switched on by closing the first switch S 1 B and opening the second switch S 1 A, and the Pockels cell 22 is switched off by operating the third and fourth switches S 2 B and S 2 A.
Other features, objects, and advantages of the invention will be apparent from the description and pickels, and from the claims. The unwanted parts of the pulse train are reflected at polarizer 4 e into beam dump B, where they can be absorbed.
With cll high contrast, in addition it is also possible to suppress post-pulses that may arise as a result of still circulating and amplified radiation owing to a main pulse not being coupled out perfectly.
Since the edges of such high voltage pulses are usually quite fast, it is possible to deliberately slow them down, either by adding resistance to the circuit from the node P to the ground terminal.