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. These high voltage switches are capable of switching voltages from several kilovolts to several tens of kilovolts with transition times in the order of a few nanoseconds. As can be easily seen from FIGS. Just as well, as described in FIGS. The second node is connected via a third wire containing a resistor with a first electric potential and via a fourth wire containing a switch with a second electric potential. A driver according to the invention now has at least another switch that connects one of the nodes to the second electric potential. Optical waveform measurement by optical sampling with a mode-locked laser diode.
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Bergmann Messgeraete Entwicklungs KS.
Their switching times of many nanoseconds restricts the use of mode coupled laser source to ones with repetition rates below MHz and also necessitate regenerative amplifiers with large resonators having turn-around times of more than 10 ns. Using devices according to the invention for controlling the voltage applied to Pockels cells within laser systems, new configurations of ultrashort pulse lasers are possible, which, at present state-of-the-art would not work or would not function properly, e.
The average power of the selected pulses will thus be a factor ten higher than the residual background radiation. Orientation and polarity in collectively migrating cell.
In particular, it is the object of the invention to provide a circuit for controlling Pockels cells that allows to select laser pulses with pockells switching times, high repetition rate of switching and good contrast between selected and not selected laser pulses. Pulse sequences with well defined widths and spacing can be produced for certain applications. In combination with some further optical elements, such as polarizers or mirrors, this Pockels cell can, cel applying an electrical voltage ranging from V to a few kilovolts .
BME – Bergmann Messgeraete Entwicklung: Pockels Cell Drivers
Both the first and second electric potentials can be given by either the pole of a voltage source or ground. Mass spectrometric analysis of surfaces. Details of the necessary control circuits need not be discussed here, as these circuits can easily be fabricated with state-of-the-art methods. High voltage is applied to pockels cell to inhibit oscillation. Normally no difference will be noticeable between operational modus A and B as the way the Pockels cell influences passing light does not depend on the polarity of the voltage applied.
Method and apparatus for modulating optical energy using light activated semiconductor switches. Using such a driver with a Pockels cell pulses can be selected in laser systems more efficiently. High-voltage switch with a cooling device.
Thorald Horst Bergmann Inventions, Patents and Patent Applications – Justia Patents Search
Acknowledgements this work has been supported by the german federal ministry of. Closing switch S 1 will apply a voltage to the Pocels cell. A mass spectrometric analysis of the content of surfaces, it is necessary to bring the analyte molecules into the gas phase. Laser light source, method of laser oscillation, and method bervmann laser processing. Fastpulse technology and its lasermetrics division are recognized as leaders in the design and manufacture of electrooptic light modulators, pockels cells, pockels cell drivers, qswitches, laser pulse pickers, optical isolators, choppers and extraction systems for research and industry.
Bergmann pockels cell driver
Pulse train generator and method for generating a repeating sequence of laser pulses. It is also possible to let the evaporated material pass right next to the mirror into the mass spectrometer.
Thus, the average power of the background radiation will be a factor of 10 times higher which is 6 mW. 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. For this reason, using state-of-the-art systems, it is presently not possible to use Pockels cells for selection of pulses in laser systems with high amplification.
Temporal shaping of high peak power pulse trains from a burst. Some applications only need one very fast transition, either switching on or off, whereby the other transition time cell well reach microseconds. The capacitors CS 1 and CS 2connected in parallel to the switches S 1 and S 2 show their intrinsic switch capacitances.
Pockels cell driver circuit with inductances bergmann. This switch can either replace the usually used recharging resistors R2 or can be placed to these in parallel. The residual transmission of the not selected ebrgmann results in a background radiation whose intensity is often higher than the energy of the selected laser pulses.
The further one or two switches can be arranged in a number of different ways. Bergmann Messgeraete Entwicklung KG.
The voltage necessary to reach the two named states of the system are determined by the crystal parameters and the wavelength of the light used.