Fotona D.d.

Fotona D.o.o.

Marko Marincek

Matjaz Lukac

Marko Kazic

Tadej Perhavec

Boris Cencic

Dejan Skrabelj

Karolj Nemes

Matjaz Mocnik

Janko Nendl

Lukac Matjaz

Jozica Kranjec

Marko Leskovar

Janez Zabkar

Mocnik Matjaz

A Laser system is disclosed which comprises a pump, wherein the laser system is adapted to be operated in pulsed operation so that at least one individual pulse of a temporally limited pulse duration (T) is generated, wherein the pulse ablates a material such that a debris cloud forms above the ablated material. Further, the pump power of the pump is modulated in such a way that the following three conditions are fulfilled: (1) the intensity of the pulse oscillates between maximum values and minimum values during the pulse duration, wherein the laser pulse comprises a plurality of intensity maxima Iwhich occur at times {T, i=1, . . . N}; and a plurality of intensity minima Iwhich occur at times {t, k=1, . . . (N&#x2212;1)}, wherein the intensity does not vanish at the intensity minima; (2) the intensity oscillations of the laser pulse induce oscillations of the size of the debris cloud so that, during the pulse duration (T), there are at least two maxima of the size of the debris cloud which occur at times {, j=1, . . . M} and which are located in between two intensity maxima of the laser pulse; and (3) at least 70 percent of the maxima of the size of the debris cloud occur near an intensity minimum of the pulse such that, for at least 70 percent of the maxima of the size of the debris cloud, the intensity of the pulse I() at the time of the maximum of the size of the debris cloud is smaller than I(t)+0.5&#xd7;[I(T)&#x2212;I(t)], wherein I(t) is the intensity minimum of the pulse which is closest to the maximum of the size of the debris cloud at timeand I(T) is the intensity maximum of the pulse which is closest to the maximum of the size of the debris cloud at time.

Laser system for tissue ablation

A laser system for medical treatment is disclosed which comprises a pump, wherein the laser system is adapted to be operated in pulsed operation so that at least one laser pulse of a temporally limited pulse duration (T) is generated. The generated laser pulse irradiates some part of the human or animal body so that a two-dimensional laser spot S is located on the top layer of the irradiated part of the human or animal body. The pump power of the pump of the laser system is modulated in such a way that the cumulative energy E(T/2) which is delivered by said laser pulse to said laser spot S during the first half of the pulse duration is less than 45% of the energy E(T) which is delivered by said laser pulse to said laser spot S during the entire pulse duration T.

Laser system and method for controlling the laser pulse shape

An articulated arm for applying a laser beam to a treatment zone has an arm section and a horizontal pivot joint. A spring arrangement acts on the pivot joint and has a cam disk and a pressure member following the cam disk contour as the arm section pivots. The arm section has, relative to a vertical direction, positive and negative pivot angle ranges. In the positive range the spring arrangement relieves the pivot joint from weight forces. When a resting angle in the negative range is reached the articulated arm rests in a support device. A total moment resulting from a weight force moment of the articulated arm and a restoring moment of the spring arrangement acts on the articulated arm about the pivot joint; cam disk contour and spring pretension are matched such that for the resting angle the total moment is oriented toward the support device.

Manually guided articulated arm

In a method for operating a laser system in a Q-switched mode, the laser system provided with a laser resonator with a laser medium and an electro-optical modulator, wherein the electro-optical modulator has an EOM crystal, wherein the EOM crystal has a characteristic ringing time (t) when subjected to acoustic ringing, the EOM crystal is driven by modulator voltage pulses (p) having a modulator voltage pulse duration (t). A train of at least two subsequent laser pulses (p) is generated. The modulator voltage pulse duration (t) is selected to be at least approximately equal to the characteristic ringing time (t) of the EOM crystal multiplied by an integer factor.

Method for operating a laser system

A laser system has a laser source generating a laser beam, wherein the laser source is adapted for medical removal of body tissue by the laser beam within a predetermined treatment contour. A guide frame in the shape of the treatment contour is provided. A scanner is provided for completely scanning a base surface of the guide frame with the laser beam, wherein the scanner is arranged between the laser source and the guide frame in a path of the laser beam.

Laser system for medical removal of body tissue

The invention relates to laser system with a laser source and an articulated arm. The articulated arm has an optical arrangement for guiding a laser beam from the laser source along an optical path in the articulated arm to a target location. Within the optical path at least one crossing area (focus or focal point) of the laser beam is provided. The optical arrangement has at least one optical cell with an input window and an output window for passing the laser beam therethrough, wherein the crossing area is positioned within the optical cell. The optical cell has a gas fill with an energy threshold for ionization that is increased in comparison to that of ambient air.

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Ljubljana, Slovenia

Marko Marincek