This is done by arranging collision cell and detector into separately pumped vacuum regions, each region having its own pumping port, the regions only being connected via flow restrictions in the vicinity of the ion optical axis. The second node SK 2 is connected via a third wire with resistor R 2 to the high voltage supply HV, via a fourth wire and switch S 2 to ground. This laser beam is focused onto the surface with a mirror that is placed as close as possible to the analysed surface. Pulse sequences with well defined widths and spacing can be produced for certain applications. A highaveragepowerdiodepumped nd yvo4 regenerative laser.
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The first upgrade made to the lasers was replacement of the original manufacturers pockels cell drive circuit with a pockels cell driver manufactured by bergmann messgerate entwicklung kg. For instance this allows alternating pulses with different properties.
BME – Bergmann Messgeraete Entwicklung: Pockels Cell Drivers
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. The timing diagram shows the sequence of switch states and the resulting voltage applied to the Pockels cell.
As long as bergman voltage is applied to the Pocksls cell, the laser pulses will bounce back and forth between the end mirrors of the resonator, being extract via state-of-the-art methods by using a polarizing element and applying voltage to the Pockels cell. Switch S 2 B must be closed before closing switch S 1. A highaveragepowerdiodepumped nd yvo4 regenerative laser.
Bergmxnn invention relates to an activation circuit for a Pockels cell, comprising a first circuit node P1which can be connected to a first connection of the Pockels cell CPand a second circuit node P2which can be connected to a second connection of the Pockels cell CPwherein the first circuit node P1 is connected by means of a first line to a first electrical potential HV1 across a first switch S1B and by means of a second line to a second electrical potential HV2 across a second switch S1Aand the second circuit node P2 is connected by means of a third line to a third electrical potential HV3 across a third switch S2B and to a fourth electrical potential HV4 across a fourth bergmsnn S2Aand HV1 is more positive than HV2 and HV3 is more positive than HV4, wherein the difference of the potentials HV1?
If linear amplifiers are used, the pulses selected from the ultra-short pulse laser pass through the amplifying berrgmann without any further optical switch.
A bme bergmann pockels cell driver charges a pockels cell bbo, clevelandcrystals lightgate 5, chosen forits hightransmission to switch the pump pulse intothe recycling cavity by rotating the pump s horizontal polarization to vertical. These high voltage switches are capable of switching voltages from several kilovolts to several tens of kilovolts with transition plckels in the order of a few nanoseconds. Yag laser and its dualstage dualpass amplified laser performance.
The timing diagram for this variant shows the switching of these two switches simultaneously. Thus, in order to couple a laser pulse into the amplifier, it is mandatory to switch on the voltage to be applied to the Pockels cell in only a few nanoseconds. As can be easily seen from FIGS. Pulse sequences with well poc,els widths and spacing can be produced for certain applications.
Bergmann pockels cell driver
For instance, a first electrical pulse on the Pockels cell can generate a laser pulse which creates a plasma cloud above the material to be processed.
The switches designated by S 1 and S 2 are high voltage switches. The applications just named can also be used cumulatively within laser systems, i. Typical applications of such ultrashort high power pulses are nonlinear optics and materials processing.
Then closing S 2the Pockels cell will be discharged. Using a driver circuit according to the invention, pulses of higher energy can be selected than previously. Taking the state-of-the-art H-configuration as a starting point where a charging resistor is placed into the first wire connecting the first node to the first electric potential and another charging resistor is placed into the third wire connecting the second node with the first electric potential, the further switch can be wired in parallel to one of these resistors and arranged in a fifth wire between one of the nodes and the first electric potential.
The main disadvantage according to the state of art here is the low contrast between the selected and the not selected pulses, which, using presently available high voltage controls for the Pockels cells is only about Patent us pockels cell driver circuit with.
Thorald Horst Bergmann, Ralf Knappe. In order to effect fragmentation of ions through collisions with gas-phase molecules, it is necessary to have a high gas pressure in the collision region. Thus it is the object of the invention to provide a Ce,l cell driver that allows a high repetition rate of switching at arbitrary duty cycle and perfectly held switch states.
During or after the recharging phase switch S 2 B is closed again. In order to achieve a very small focal point, deflection and focusing of the laser beam is done with a single optical element.
Pocels, 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. Thorald Horst Bergmann has filed for patents to protect the following inventions.
Synchronously with closing switch S 2 A, taking away the voltage across the Pockels cell, switch S 2 B is opened. Waiting some time, usually dictated by the application in question, both switches are opened simultaneously or shortly after one another.
Mass spectrometric analysis of surfaces. Should it be necessary to use single pulses or groups of pulses, quite often Pockels cells are used to select these pulses.
Pockels cell driver circuit with inductances bergmann.