DE102021001138A1 - Self-cleaning laser beam device - Google Patents

Abstract

A self-cleaning laser beam device comprises a beam window through which a laser beam can be emitted and/or received; and at least one of:- a cleaning device, which is designed to remove dirt on the outside of the jet window mechanically, thermally, by flushing technology and/or by jet technology; and a drive device which is designed at the edge of the beam window in relation to a beam axis of the laser beam to allow the beam window to rotate and/or oscillate in relation to a surrounding window frame.

Description

The present invention relates to a self-cleaning laser beam device, in particular a laser beam device designed as a laser weapon.

In the case of high-energy laser weapon systems (HEL) or transmitting and/or receiving units for laser radiation (e.g. high-energy laser telescopes, sensors, electro-optics, optics), which are intended to operate under a wide variety of environmental influences, there is typically a need to ensure a clean exit window for the laser radiation. The exit window is the interface between the inner high-purity structure of the respective laser system and the environment. The cleanliness of the protective glass of the exit window is decisive here in order to avoid undesirable effects on the laser system at high laser beam intensities. In particular, contamination of the protective glass from the exit window should be avoided.

In principle, classic solutions from other technical fields could be used to keep the glass of the exit window clean. For example, windshield wipers with mechanical wiper blades could be used for cleaning, as are known from vehicle windows.

Another example are so-called centrifugal panes, which are used on ships, among other things, to improve visibility in rain or spray, e.g. on the windscreen and viewing panes of command bridges and driver's cabins. Such a system comprises a circular centrifugal disk, which is rotatably mounted at its center, and an electric motor coupled centrally to the disk, which can cause the disk to rotate at high speed. The centrifugal force throws spray water, dirt particles and rain outwards, which enables a continuously clear view to the outside. The centrifugal disc can be sealed to the outside via a frame with a fold or a lip seal. The action of centrifugal force also cleans the joint at the lip seal and the cylindrical gap around the rotating flinger. In contrast to conventional mechanical windscreen wipers, centrifugal screens require relatively little maintenance, as they are subject to less mechanical stress. The drive can be protected on the clean side of the centrifugal disc.

However, mounting the drive in the middle of an exit window would be rather unfavorable in the case of a HEL application, as this would result in shadowing of the transmitter/receiver aperture, which could affect performance and/or system stability. Furthermore, with mechanical solutions it should be ensured that no damage is caused to window coatings due to mechanical interactions.

Against this background, the present invention is based on the object of finding solutions for preventing and cleaning contamination on optical windows of lasers, which are as gentle on the surface as possible and do not shade the respective laser.

According to the invention, this object is achieved by a laser beam device having the features of patent claim 1.

• - einer Reinigungseinrichtung, welche dazu ausgebildet ist, auf einer Außenseite des Strahlfensters Verschmutzungen auf dem Strahlfenster mechanisch, thermisch, durch Spültechnik und/oder durch Strahltechnik zu beseitigen; und
• - einer Antriebseinrichtung, welche randseitig bezogen auf eine Strahlachse des Laserstrahls an dem Strahlfenster dazu ausgebildet ist, das Strahlfenster gegenüber einem umliegenden Fensterrahmen zu rotieren und/oder schwingen zu lassen.

Accordingly, a self-cleaning laser beam device is provided. The laser beam device comprises a beam window through which a laser beam can be emitted and/or received; and at least one of:

• - a cleaning device which is designed to remove dirt on the outside of the jet window mechanically, thermally, by flushing technology and/or by jet technology; and
• - A drive device which is designed at the edge relative to a beam axis of the laser beam on the beam window to allow the beam window to rotate and/or oscillate in relation to a surrounding window frame.

One of the ideas on which the present invention is based is to provide several measures that are gentle on the surface and at the same time do not shade the beam path, if necessary in combination, to protect the optical window, ie the glass pane(s), of a laser beam device from contamination (such as water, ice, snow, salt mist , air pollution, dirt particles, bird droppings, dust etc.) or to remove this pollution. On the one hand, the invention provides for the beam window to be processed by active processing with suitable tools. On the other hand, as a further embodiment of the invention, the jet window can alternatively or additionally rotate, oscillate and/or vibrate in order to loosen dirt. The drive used for this purpose is provided at the edge in order to avoid shading of the window. This is particularly relevant in high-energy laser beam applications, where contamination of the exit window due to the high intensities of the lasers used (multi-kilowatt laser sources) can lead to damage or even destruction of the protective glass and thus the failure of the entire system. However, the innovative solutions of the invention are also suitable for laser beam devices from other technical applications in order to achieve a longer service life for an exit window or for its coating and to keep the respective system ready for use despite adverse conditions.

Advantageous refinements and developments result from the further dependent claims and from the description with reference to the figures.

According to a development, the cleaning device can be designed to be movable along at least one degree of freedom.

For example, a (possibly replaceable) cleaning head can be mounted on a movable cleaning arm in order to remove dirt in different ways. In a specific example, a cleaning head can perform swinging or rotating movements and gently clean dirt with a textile tool (e.g. soaked in solvent).

According to a further development, the laser beam device can include a pointing system, via which the laser beam device can be rotated about an elevation axis and an azimuth axis. The cleaning device can be designed to be movable along a linear degree of freedom in coordination with a movement of the straightening system.

In this case, the mobility of the straightening system can be used to save degrees of freedom of the cleaning device, e.g. a cleaning arm, and thus to simplify. Since the aiming system can rotate about the azimuth and elevation axes, the cleaning device could be designed with only one further degree of freedom, e.g. a linear degree of freedom. A wiping movement (wobbling movement), for example, could be carried out by a combined movement of the cleaning device and the straightening system.

According to a development, the cleaning device can have a textile tool soaked in a solvent.

The tool can, for example, be movably attached to a cleaning head of the cleaning device. For example, the tool can rotate on a cleaning arm. By subsequent rinsing with liquids and, if necessary, drying with gases, loosened contamination can be completely removed from the jet window.

According to a development, the cleaning device can be designed with one or more rinsing nozzles for rinsing fluids along the outside of the jet window.

In the case of light soiling, dirt particles can therefore in principle also be removed without mechanical action, for example only by rinsing with a solvent, a cleaning liquid and/or a cleaning gas and, if necessary, drying. Such rinsing nozzles can be provided both movably and immovably on the laser beam device. For example, a cleaning head of a movable cleaning arm can be designed with one or more fixed or movable nozzles.

According to a development, the cleaning device can be designed with one or more jet nozzles for treating the outside of the jet window with a high-pressure fluid jet.

Another variant would be to clean the jet window with one (or more) high-pressure fluid jet(s) (e.g. water, cleaning liquid, alcohol, de-icing agent, etc.). For example, a jet comparable to a high-pressure cleaner can clean the jet window using high pressure and/or due to a special nozzle geometry. A wide variety of driven (e.g. by the liquid pressure) and passive nozzles can be used, e.g. with a working pressure between 5 bar and 50 bar.

One or more outlet nozzles can be immovably attached to the laser beam device and directed rigidly at the beam window without relative movement (e.g. rigidly coupled to a directing system of the laser beam device). Alternatively, one or more outlet nozzles can be movably attached to the laser beam device and perform relative movements (e.g. nozzles that can be pivoted relative to a directing system of the laser beam device). Furthermore, one or more movable nozzles in a cleaning device with a plurality of translatory and/or rotary degrees of freedom can be decoupled from a directing system of the laser beam device and independently clean the beam window. Corresponding nozzles can also stand next to the straightening system without an additional degree of freedom, with the straightening system being able to move in front of the nozzle or nozzles in such a way that the nozzle or nozzles can optimally clean the jet window.

According to a development, the high-pressure fluid jet can include pressurized liquid, compressed air and/or a blasting medium.

For example, a cleaning liquid can be sprayed under high pressure. Fluids can of course also change during operation, eg a cleaning agent can be used first and then rinsed with water. In another example, compressed air can be used by means of one or more compressed air nozzles (eg from 5 bar). These can either blow dirt away in addition to water or other liquids, or they can clean the pane directly on their own due to a correspondingly high pressure.

As a further possibility, for example, dry ice, ie solid carbon dioxide with a temperature of about -79° C., or another suitable blasting medium can be used as an auxiliary. For cleaning, the dry ice particles are accelerated with compressed air and hit the material to be cleaned. As a result, the layer to be removed is locally supercooled and becomes brittle. Subsequent dry ice particles penetrate the brittle cracks and suddenly sublimate when they hit. The carbon dioxide gasifies and increases in volume, blasting the dirt off the surface. The advantages of this minimally abrasive process lie in the low level of damage to the material to be cleaned and in the fact that no cleaning medium remains for disposal after processing, since the CO ₂ evaporates in gaseous form in the ambient air. Since dry ice is relatively soft, many surfaces are not damaged.

According to a development, the cleaning device can have a cleaning laser. The cleaning laser can be designed to act with laser pulses on the outside of the beam window to loosen dirt particles.

A cleaning laser can remove the dirt particles through thermal effects using short, intense and focused laser pulses. The gases produced by evaporation in this way can then be sucked off by a suction device. For example, a cleaning head of a cleaning arm can be designed with one or more such cleaning lasers. These can be designed to be movable on the head. Of course, they can also be moved by moving the cleaning head and/or the cleaning arm.

According to a development, the drive device can have rotatable drive rollers, via which the jet window is mounted so that it can rotate with respect to the window frame.

The beam window, i.e. the glass, can be held in one plane with several rotatable rollers, whereby one or more of these rollers can in turn be rotated by a drive. These driven elements can be positively and/or frictionally connected to the beam window. By rotating the roller(s), which can also serve as a guide element for the blasting window, the blasting window can also be made to rotate and any contamination can be thrown away by adjusting the rotational speed accordingly. The roles can advantageously take over the storage of the beam window.

It is clear to the person skilled in the art that a rotary seal can be provided between the beam window and the window frame or the surrounding laser beam device (e.g. the aiming system). Conventional friction seals can be used for this, but also e.g. ferrofluid seals and grease-filled labyrinth seals.

According to a development, the drive device can be designed as an electric motor. A rotor of the electric motor can be integrated into the edge of the jet window and/or coupled to it. A stator of the electric motor can be embedded in the window frame.

Another way to set the beam window in rotation is to “embed” the window directly in a motor, so to speak. In this case, the window can be connected directly to the rotor, which is located inside the stator. If the motor (e.g. a torque motor) is switched on, the rotor and thus the exit window rotate in a highly dynamic manner. Due to the high dynamics as well as changes in direction and suitably modulated control signals, the window can in principle be set in oscillating micro-movements, which can loosen dirt. A wide variety of acceleration and speed profiles can be run, depending on the type of dirt and the degree of dirt. As a result, dirt, water, etc. are thrown away. The rotation of the window pane could be combined with a mechanical, stationary washing device with reduced degrees of freedom.

According to a development, the drive device can be designed to excite the beam window to micro-oscillate.

With this approach, the beam window itself can also be cleaned using ultrasound. The beam window itself is set into ultra-fast micro-movements, for example by means of piezo elements offset, whereby dirt, ice, etc. are blown away to a certain extent or liquids are correspondingly shaken away or evaporated away, in particular due to cavitation.

According to a development, the laser beam device can include a contamination sensor. The contamination sensor can be designed with an infrared camera to detect contamination on the outside of the beam window by detecting a local temperature increase on the beam window and/or by detecting scattered light from the beam window.

Contamination on the beam window can be detected by one (or more) special IR cameras. An IR camera detects laser emission of a local increase in temperature or directly the scattered light of the glass surface caused by dirt particles.

According to a development, the laser beam device can include an air curtain device. The air curtain device may be configured to create a continuous flow of gas across the outside of the jet window.

For example, the air curtain may be permanently activated during operation of the laser beam device, e.g., after opening an exit iris or opening a cover flap. In the narrow air wedge created by the air curtain, air flows at high speed (if possible laminar) and prevents dirt, water or dust particles from getting onto the glass of the jet window. Particles are transported away from the pane by the air flow.

According to a development, the outside of the beam window can be formed with a chemically and/or physically conditioned functional surface, which can be hydrophobic, oleophobic and/or anti-reflective.

In this variant, the beam window can thus contain a protective glass with at least one surface that is functionalized on the outside. The functionalization of the surface, i.e. a special structure, is intended to prevent or at least greatly reduce the adhesion of dirt and at the same time give the protective glass anti-reflective properties. Functionalization, i.e. changing the surface of a glass (e.g. Suprasil), can be carried out by chemical (e.g. plasma polymerisation process) and/or physical conditioning processes (e.g. dry etching process). The aim of conditioning the surface(s) should be water repellency (hydrophobia) and/or oil repellency (oleophobia), i.e. when wetted the so-called contact angle of a liquid drop should be greater than 90°. A contact angle of greater than 150° would be ideal, i.e. achieving so-called superhydrophobic or superoleophobic properties. At the same time, the surface should significantly reduce residual reflectivity compared to untreated glass. This type of anti-reflection coating offers the further advantage that, in comparison to dielectric layers, it enables consistently high transmission over a large wavelength range. In addition, the surface structuring offers the further advantage of a higher damage threshold compared to conventional dielectric anti-reflective layers.

The above configurations and developments can be combined with one another as desired, insofar as this makes sense. Further possible configurations, developments and implementations of the invention also include combinations of features of the invention described above or below with regard to the exemplary embodiments that are not explicitly mentioned. In particular, the person skilled in the art will also add individual aspects as improvements or additions to the respective basic form of the present invention.

• 1 schematische perspektivische Frontansicht einer selbstreinigenden Laserstrahleinrichtung gemäß einer Ausführungsform der Erfindung; und
• 2-3 schematische Frontansichten von Austrittsfenstern für die Laserstrahleinrichtung aus 1 gemäß zweier alternativer Ausführungsformen der Erfindung.

The present invention is explained in more detail below with reference to the exemplary embodiments given in the schematic figures. They show:

• 1 schematic perspective front view of a self-cleaning laser beam device according to an embodiment of the invention; and
• 2-3 schematic front views of exit windows for the laser beam device 1 according to two alternative embodiments of the invention.

The accompanying figures are intended to provide a further understanding of embodiments of the invention. They illustrate embodiments and, together with the description, serve to explain principles and concepts of the invention. Other embodiments and many of the foregoing advantages will become apparent by reference to the drawings. The elements of the drawings are not necessarily shown to scale with respect to one another.

In the figures of the drawing, elements, features and components that are the same, have the same function and have the same effect--unless stated otherwise--are each provided with the same reference symbols.

1 shows a schematic perspective front view of a self-cleaning laser beam device 10 according to an embodiment of the invention.

The self-cleaning laser beam device 10 comprises a circular beam window 1 through which a laser beam can be emitted and/or received. The laser beam device 10 can in particular be a laser weapon, i.e. in this case the beam window 1 serves as an exit window for a high-energy laser beam which emerges from the beam window 1 more or less perpendicularly.

In the system shown, various sensor, protection and cleaning measures are combined in order to protect the glass of the beam window 1 on an outside 4 from contamination or to remove it. Especially in the case of the exemplary HEL application, the cleanliness of the beam window 1 should be ensured, since contamination of the window glass can result in damage or even destruction due to the high intensities of the laser beam used.

As is known from the HEL field, the laser beam device 10 is mounted on a base 19 via an aiming system 6, which allows rotation about an elevation axis 6a and an azimuth axis 6b in order to suitably align the laser beam. The beam window 1 is mounted on a housing 18 via a window frame 5 . A hinged cover 15 is used to close the beam window 1 when the laser beam device 10 is in an inactive state. Optionally, a closable iris can also be provided around the beam window 1 for this purpose.

In this configuration, the beam window 1 has a protective glass which is formed on the outside 4 with a chemically and/or physically conditioned functional surface which is hydrophobic, oleophobic and/or anti-reflective. On the one hand, this ensures that liquids and other dirt do not settle on the surface of the outside 4 in the first place. On the other hand, the best possible transmission for the laser beam should be maintained at the same time. Such surface structures also offer the further advantage of a higher damage threshold, i.e. they are less susceptible to mechanical stress than conventional glasses.

Since contamination cannot be completely ruled out in real use, despite the dirt-repellent properties of the protective glass, further measures for detection and elimination are provided here, as described below.

The laser beam device 10 further comprises an air curtain device 14 which is formed above the beam window 1 with a slot nozzle directed downwards onto the beam window 1 in order to generate a continuous air flow over the outside 4 of the beam window 1 . This air curtain thus supports the dirt-repellent properties of the protective glass in that dirt particles and other substances are transported downwards as soon as they reach the beam window 1.

In addition, the laser beam device 10 includes a contamination sensor 13, which is designed with an infrared camera to detect contamination on the outside of the beam window 1 by detecting a local temperature increase on the beam window 1 and/or by detecting scattered light from the beam window 1. Deposits and other contaminants on the outside 4 of the beam window 1 can thus be detected with the aid of the contamination sensor 13 so that they can be removed again immediately.

In order to clean the beam window 1 , the laser beam device 10 includes a cleaning device 2 which is designed to remove dirt on the beam window 1 on an outside 4 of the beam window 1 . For this purpose, the cleaning device 2 can combine different approaches with one another.

In the example shown, the cleaning device 2 specifically comprises a movable cleaning arm 16 which has a cleaning head 17 at one end. The height of the cleaning arm 16 can be adjusted (see arrow) in order to position the cleaning head 17 over the beam window 1 . A coordinated control of the straightening system 6 and the cleaning head 17 or the cleaning arm 16 may suffice for complete processing of the outer surface 4 of the beam window 1 if the cleaning device 2 only has a linear degree of freedom of movement. The aiming system 6 can rotate the laser beam device 1, for example, about the elevation and azimuth axis (6a, 6b), while the cleaning head 17 moves in a coordinated manner along one axis (cf. arrow above the cleaning head 17 in 1 ) to achieve a wiping movement on the outside 4 of the beam window 1.

In the example of 1 the cleaning head 17 is equipped with a rinsing nozzle 7, via which a liquid cleaning agent can be rinsed onto the jet window 1 for cleaning. In principle, the cleaning head 17 can also include a device (not shown) for subsequent drying of the surface, for example with the aid of hot air.

In the illustrated embodiment, the cleaning device 2 also includes a jet nozzle 8 which is fixed in its position on the window frame 5 and aligned with the jet window 1 . The blasting nozzle 8 can be designed to treat the outside 4 of the blasting window 1 with the aid of a high-pressure fluid jet, e.g. compressed air with or without an additional blasting agent such as dry ice or another suitable material. The blasting nozzle 8 can be pivotable or otherwise movable in order to be able to process the entire outer surface 4 of the blasting window 1 as uniformly as possible.

It goes without saying that the design in 1 is purely exemplary. In general, one or more rinsing nozzles and/or jet nozzles can be provided so as to be movable or immovable for cleaning the jet window 1, for example on a cleaning arm and/or on a window frame. Likewise, such devices can be mounted elsewhere.

Furthermore, mechanical and/or thermal methods can also be used in addition to a rinsing and/or blasting technique approach. For example, in other embodiments, a rotating textile tool soaked in solvent can be provided on the cleaning head 17 . In another concrete example, the cleaning head 17 can have a pulsed cleaning laser that processes the outside 4 with short, intense and focused laser pulses in order to vaporize dirt from the beam window 1 . Different advantageous combination options of these or other suitable cleaning approaches will become apparent to the person skilled in the art from the context of the present application.

The design of the cleaning device 2 can be supplemented or replaced by designing the jet window 1 to be movable within the window frame 5 in order to throw dirt away from the outside 4 by means of ultra-fast micro-oscillations and/or micro-rotational movements. For this purpose, the cleaning device 2 also includes a drive device 3, which is designed on the edge of the beam window 1 in relation to a beam axis of the laser beam through the beam window 1 to rotate and/or oscillate the beam window 1 relative to a surrounding window frame 5.

2 and 3 show two exemplary implementations for such a drive device 3.

In execution in 2 the drive device 3 is designed as an electric motor with a rotor 11 integrated into the beam window 1 at the edge or coupled to it and a stator 12 embedded in the window frame 5 . For example, the electric motor can be designed as a torque motor in order to achieve very high torques at relatively low speeds and to implement the desired oscillating micro-movements through rapid changes in direction.

3 shows an alternative embodiment of the drive device 3, in which the jet window 1 is rotatably mounted in the window frame 5 via three movable drive rollers 9. By suitably modulated control of the individual drive rollers 9, as in 2 Micro-oscillations are generated by means of rapid changes in direction.

It goes without saying here that the person skilled in the art can also provide alternative approaches for generating micro-movements. For example, piezo elements can be distributed around the circumference of the beam window 1 in order to generate microvibrations in the beam window 1, which evaporate impurities from the outside 4 by means of ultrasound (cold evaporation without the effect of heat).

All in all, various preventive measures to prevent and detect contamination as well as surface-friendly cleaning methods for dirty windows using laser radiation, high pressure and/or ultrasound without obscurations/shadowing are provided, which can be advantageously combined to achieve a maximum effect.

In the foregoing Detailed Description, various features have been grouped together in one or more examples to improve the rigor of presentation. However, it should be understood that the above description is merely illustrative and in no way restrictive. It is intended to cover all alternatives, modifications, and equivalents of the various features and embodiments. Many other examples will be immediately and immediately apparent to those skilled in the art in view of the above description.

The exemplary embodiments were selected and described in order to present the principles on which the invention is based and its possible applications in practice as best as possible be able. This enables those skilled in the art to optimally modify and use the invention and its various exemplary embodiments in relation to the intended application. In the claims and the description, the terms “including” and “having” are used as neutral terms for the corresponding terms “comprising”. Furthermore, the use of the terms “a”, “an” and “an” should not fundamentally exclude a plurality of features and components described in this way.

Reference List

1

beam window

2

cleaning device

3

drive device

4

outside

5

window frames

6

straightening system

6a

elevation axis

6b

azimuth axis

7

flushing nozzle

8th

jet nozzle

9

drive roller

10

laser beam device

11

rotor

12

stator

13

contamination sensor

14

air curtain facility

15

cover

16

cleaning arm

17

cleaning head

18

Housing

19

base

Claims (15)

Self-cleaning laser beam device (10), comprising: a beam window (1) through which a laser beam can be emitted and/or received; and at least one of: a cleaning device (2) which is designed to remove dirt on the outside (4) of the jet window (1) mechanically, thermally, by rinsing technology and/or by blasting technology; and a drive device (3) which is designed on the edge of the beam window (1) relative to a beam axis of the laser beam to rotate and/or oscillate the beam window (1) relative to a surrounding window frame (5). Laser beam device (10) after claim 1 , wherein the cleaning device (2) is designed to be movable along at least one degree of freedom. Laser beam device (10) after claim 1 or 2 , further comprising: a directing system (6) via which the laser beam device (10) can be rotated about an elevation axis (6a) and an azimuth axis (6b), the cleaning device (2) being movable along in coordination with a movement of the directing system (6). a linear degree of freedom is formed. Laser beam device (10) according to one of Claims 1 until 3 , wherein the cleaning device (2) has a textile tool soaked in a solvent. Laser beam device (10) according to one of Claims 1 until 4 , wherein the cleaning device (2) with one or more rinsing nozzles (4) for rinsing fluids along the outside of the jet window (1) is formed. Laser beam device (10) according to one of Claims 1 until 5 , wherein the cleaning device (2) is designed with one or more jet nozzles (8) for treating the outside (4) of the jet window (1) with a high-pressure fluid jet. Laser beam device (10) after claim 6 , wherein the high-pressure fluid jet comprises at least one of pressurized liquid, compressed air and a jet of abrasive. Laser beam device (10) according to one of Claims 1 until 7 , wherein the cleaning device (2) has a cleaning laser which is designed to act with laser pulses on the outside (4) of the beam window (1) to loosen dirt particles. Laser beam device (10) according to one of Claims 1 until 8th , wherein the drive device (3) has rotatable drive rollers (9) via which the beam window (1) is rotatably mounted relative to the window frame (5). Laser beam device (10) according to one of Claims 1 until 9 , wherein the drive device (3) is designed as an electric motor, with a rotor (11) of the electric motor in the beam window (1) integrated at the edge and / or gekop with this pelt and wherein a stator (12) of the electric motor is embedded in the window frame (5). Laser beam device (10) according to one of Claims 1 until 10 , wherein the drive device (3) is designed to excite the beam window (1) to micro-oscillations. Laser beam device (10) according to one of Claims 1 until 11 , furthermore with: a contamination sensor (13), which is designed with an infrared camera to detect contamination on the outside of the beam window (1) by detecting a local temperature increase on the beam window (1) and/or by detecting scattered light from the beam window (1 ) to determine. Laser beam device (10) according to one of Claims 1 until 12 , further comprising: an air curtain device (14) adapted to generate a continuous flow of gas across the outside (4) of the jet window (1). Laser beam device (10) according to one of Claims 1 until 13 , wherein the outside (4) of the beam window (1) is formed with a chemically and/or physically conditioned functional surface which is at least one of hydrophobic, oleophobic and anti-reflective. Laser beam device (10) according to one of Claims 1 until 14 , wherein the laser beam device (10) is designed as a laser weapon.

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