A high repetition rate laser system with such as amplitude control for individually transmitted laser pulses can favorably be used for material processing, such as drilling holes or grooves with single laser pulses, specifically with respect to their depths or widths, etc. 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 1 , wherein the switching unit comprises a push-pull circuit. 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 accompanying drawings are provided to ensure a further understanding of embodiments and are integrated into the present description and form part thereof.
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In accordance with a third aspect, the present disclosure relates to a laser system comprising at least one Pockels cell in accordance pcokels the second aspect. In some embodiments, the switching unit applying a switchable high voltage to the Pockels cell is or includes a push-pull circuit.
The switching unit 21 has a double push-pull circuit 21 including mbe first push-pull circuit 21 a and a second push-pull circuit 21 b. Bergmann Messgeraete Entwicklung KG. This type of dell, regenerative amplifier, controllable Pockels cell system can be particularly advantageous as compared to an acousto-optical modulator.
The first node is connected via a third switch to a second potential, such as a ground terminal, while the second node is connected via a fourth switch to the second potential.
The details of one or more embodiments of the invention are set forth in the accompanying drawings and the description below.
BME – Bergmann Messgeraete Entwicklung: Pockels Cell Drivers
Mass spectrometric analysis of surfaces. The laser system as claimed in claim 7wherein: Preferably the delay unit can be controlled by an analog signal that determines the time delay of the control signal s through the delay unit. 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. These types of amplifiers are, as an example, described in the German Application No. The delay unit 13 produces an arbitrary temporal displacement between the high voltage pulse applied to the Pockels cell 12 and the incoming laser pulse.
The system of claim 3, wherein the time delay is controlled by an analog signal applied to the delay unit. After the pocels pass through the gain mediumthe Pockels cell is switched on.
Pockels Cell Drivers
Some aspects of the invention feature a controllable Pockels cell system that allows for a particularly fast amplitude variation of laser pulses. The system of claim 4wherein the delay unit is controllable to generate equal time delays for both control signals. However, it can also mean that the elements mentioned are not directly coupled to one another and that further elements celll coupled between the elements mentioned.
In some cases these parameters render the attainable switching speed too slow for a number of applications, such as suppressing pre- or post-pulses to a laser pulse that is extracted from an optical cavity. A method of producing short or ultrashort laser pulses of variable amplitude, the method comprising directing a pulse train of laser pulses towards the Pockels cell system of claim 1.
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. Method and apparatus for producing isolated laser pulses having a fast rise time. The amplitude of a laser pulse transmitted through an electro-optical modulator is controlled by the amplitude of the voltage signal applied to the Pockels cell.
Thorald Horst Bergmann Inventions, Patents and Patent Applications – Justia Patents Search
Search Expert Search Quick Search. Like reference symbols in the various drawings indicate like elements.
The Pockels cell system 10 includes a Pockels cell 12 and a controller operably connected to the Pockels cell 12 and including a switching unit 11 and a delay unit If the voltage pulse is shifted as a whole, the Pockels cell system 20 includes delay units 13 and 23which receive the same analog signal.
HV2 and the difference of the potentials HV3?
The first and second delay units 13 and 23 generate control signals with individually controllable time delays pockeos each control signal. An important parameter for selecting the type of modulator is the attainable switching time. The delay unit receives a trigger signal and generates control signals to the first and second switches.
The system of claim 3wherein the delay unit is connected to both the first switch and the second switch, and wherein the delay unit receives a trigger signal and generates respective control signals to the first and second switches with individually controllable time delays for each control signal. High-voltage switch pocoels a cooling device. According to this method, a pulse train of laser pulses is directed towards an electro-optical modulator as described above, a laser pulse is selected cwll the electro-optical modulator and directed to a first output port of the electro-optical modulator.
Ideal for pulse selection and ultrafast laser regenerative amplifier designs up to 2. A laser system comprising at least one Pockels cell comprising the driver circuit as claimed in claim 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.