25. Juni 2019 at 21:57

The second delay unit 23 receives a second trigger signal 14 b and generates control signals 17 b and 16 b applied to third and fourth switches S 2 B and S 2 A. The laser system of claim 12, wherein the laser light source comprises a laser oscillator that produces laser pulses, and a laser amplifier that amplifies the laser pulses produced by the laser oscillator. If the first potential is a positive high voltage terminal, the second potential can also be a negative high voltage terminal instead of a ground terminal. If one of the transition times is slower that the other one, this edge may favorably be used for the intensity control, as a slower edge will allow for a more precise determination of the transmitted intensity. The time of the rising of falling edge of the voltage pulse may be positioned such as to achieve the desired amplitude of the transmitted laser pulse. Commonly used devices for switching laser pulses are optical switches or modulators placed in the beam path within or outside of a laser resonator.

Uploader: Kazilkree
Date Added: 11 June 2009
File Size: 40.24 Mb
Operating Systems: Windows NT/2000/XP/2003/2003/7/8/10 MacOS 10/X
Downloads: 56186
Price: Free* [*Free Regsitration Required]

The time delays are controlled by analog signals 15 a and 15 b received to the delay units 13 and pockelss After the first pass through the gain mediumthe Pockels cell is switched on. The gain medium can have for example an intrinsically low gain governed, as is known, by the material, as is the case for example for materials such as Yb: 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.

A Pockels cell can be switched back and forth between two states by means of a suitable switchable high-voltage supply. The delay unit can pockela an input port for a trigger signal and first and second output ports for control signals.

Slow modulators are generally not capable of suppressing these pre-pulses. 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.

Alternatively this can also be done by adding capacitance to the circuit or by increasing the self-capacitance of the switch S 1 A or the capacitance of the Pockels cell This effect will be detrimental in low-gain amplifiers because the amplified pulse will have a high energy pkckels some time before it is extracted. Such an electrical control can efficiently select individual laser pulses, allowing the precise generation of pulse sequences with defined time intervals for certain applications.

Commonly used devices for switching laser pulses are optical switches or modulators placed in the beam path within or pockelw of a laser resonator. Pockels cell bmw circuit with inductances.

BME – Bergmann Messgeraete Entwicklung: Pockels Cell Drivers

This can be made possible by the described exemplary embodiments of driver circuits. Pockels cell driver circuit for rapidly varying the pulse amplitude of short or ultrashort laser pulses. Electro-optical modulators have faster switching speeds and have in recent time been improved, now also allowing the high repetition rates that are attainable with acousto-optical modulators.

The laser system as claimed in claim 7wherein: Click for automatic bibliography generation.

US20080018977A1 – Controlling pockels cells – Google Patents

An analogous feedback loop control can be set up with an electro-optical modulator 5 i within the laser resonator. 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. Particularly with such long opening times, it is extremely important that the Pockels cell has a contrast that is as constant as possible over the entire opening time, and brings about as far as possible minimum resonator-internal losses or a maximum pre-pulse contrast, since an excessively low pre-pulse contrast is tantamount to radiation coupled out before the actual laser pulse.

Switchable two-wavelength frequency-converting laser system and power control therefor.

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

The first control signal 16 actuates the second switch S 1 A and the second control signal 17 actuates the first switch S 1 B. The system of claim 7, wherein the first push-pull circuit comprises a first switch connected to both a first potential and a first node, and a second switch connected to both a second potential and the first node; wherein the second push-pull circuit comprises a third switch connected to both the first potential and a second node, and a fourth switch connected to both the second potential and the second node; wherein the delay unit is a first delay unit connected to one of the first and second push-pull circuits; and wherein the Pockels cell is connected to the first node and to the second node.

This well defined transmission versus time function will be applied synchronously with the impinging laser pulses to the Pockels cell, synchronous to every laser pulse, for example, to every second laser pulse or to every nth laser pulse. The node P is connected to the Pockels cell 12 and to the second switch S 1 A. Thus, by using two delay units, the switching times of all four switches may be modified by analog signals with individually set and controlled delays.

This invention relates to controlling Pockels cells, to systems and methods relating to such cells, and to methods of producing and controlling short or ultrashort laser pulses. What is claimed is: In particular, with regard to the different functions carried out by gme components or structures described above, the expressions described for describing such ceol, unless indicated otherwise, are intended to correspond to an arbitrary component or structure which carries out the specified function of the described component which is e.

It is also possible to modulate a pulse train of laser pulses by the electro-optical modulators together if the laser pulses are closely enough spaced in time and have energies of similar dimension. The system of claim 3, wherein the time delay is controlled by an analog signal applied to the delay unit.

Contact us now to discuss your next project. DE A1, the contents of which are incorporated herein by reference.

Pockels Cell Drivers

A first potential, such as a positive high voltage terminal, is connected via a first switch to a node, which is connectable to a first connector of the Pockels cell. High-voltage switch with a cooling device. The voltage or charge is removed pocke,s the Pockels cell 12 by opening the first switch S 1 B and with a time delay closing the second switch S 1 A.

The post BME POCKELS CELL DRIVER appeared first on Sevac.