Method of forming spatial profile of laser beam intensity

FIELD: physics, optics.

SUBSTANCE: method involves formation of an initial converging laser beam and converting it to a beam with polarisation mode distributed on the aperture using a birefringent element, polarisation filtering of the beam with a polariser, adjustment of the spatial profile of intensity of the beam by rotating the birefringent element, or the polarisation vector of the initial converging beam, or polariser. The birefringent element is a birefringent plate lying between telescopic lenses and enables creation of a non-identical angle between the axis of the birefringent plane and the wave vector of an extraordinary ray for identical angles of deviation of the rays from the axis of the beam, which enables formation of a parabolic spatial profile of intensity after polarisation filtering, identical in one of the planes along the direction of propagation and all planes parallel to the said plane on the entire aperture of the beam.

EFFECT: formation of a laser beam with a parabolic spatial profile of intensity with controlled level of intensity of radiation at the centre of the parabola, as well as controlled position of the parabola on the aperture of the beam.

3 dwg

 

The technical field

The invention relates to the field of quantum electronics, in particular to laser technology, and can be used to produce light beams with a given spatial beam intensity profile.

The level of technology.

Currently, the urgent task of the most powerful lasers is to obtain maximum energy of the laser beam at the output terminal of amplification stages. The solution to this problem is largely determined by the capability of forming a uniform output spatial profile of the beam. The parameters of the reflectors of the cascades, as well as superluminescence, as a rule, do not allow to obtain a uniform aperture cascade gain and, as a consequence, the radiation pulse with a rectangular spatial profile with the passage of the cascade increases unevenly across the aperture. Compensate for the gain flatness of the radiation aperture of the cascade application of the preliminary spatial profiling of the input beam.

The known method of forming a spatial profile of the beam, including the conversion of the source beam in a beam of rectangular aperture, the beam spatial intensity profile, the same in one of the planes along the direction of propagation and all planes parallel to her Posey aperture of the beam [1]. The aperture of the beam generated by this method, rectangular, spatial profile along the major axis of the beam is uniform and along the lesser - Gaussian.

The disadvantage of this method is the impossibility of forming a beam with a parabolic spatial profile.

The known method of forming a spatial profile of the laser beam, comprising converting the source beam into a beam with a distributed aperture of the state of polarization of the polarization filter, the adjustment of the spatial profile of the beam by rotating birefringent element [2]. This method allows you to create bundles with parabolic spatial profile that is symmetrical about the optical axis of the system.

The disadvantage of this method is the impossibility of forming a parabolic spatial profile of the beam are the same in one of the planes along the direction of propagation and all planes parallel to it across the aperture of the beam.

Known chosen as the prototype of the method of formation of the spatial profile of the laser beam, including the formation of a convergent beam, the beam with distributed along the aperture of the state of polarization through the birefringent element, the polarization selection, adjustment of the spatial profile of the beam surface is Rotom birefringent element, vector polarization and polarization-selectivity [3]. This method allows to form a converging laser beam with symmetrical about the optical axis, the spatial intensity profile and adjustable size of the beam near the focal plane.

The disadvantage of this method is the impossibility of forming a beam with a parabolic spatial profile, the same in one of the planes along the direction of propagation and all planes parallel to it across the aperture of the beam.

Disclosure of the invention.

The technical result of the invention is the formation of a laser beam with a parabolic spatial profile, the same in one of the planes along the direction of propagation and all planes parallel to it across the aperture of the beam, with adjustable intensity level of radiation in the center of the parabola, and the adjustable position of the parabola through the aperture of the beam.

This technical result of the proposed solution is achieved by a method of forming a spatial profile of the laser beam includes forming a converging laser beam, converting the beam into a beam with a distributed aperture of the state of polarization through the birefringent element, the polarization selection of the beam, the adjustment of the spaces of the frame profile of the beam by turning the birefringent element or of the polarization vector, or polarization-selectivity of the element. The new method is that after the formation of a beam with a distributed aperture of the polarization state of the carry out the collimation of the beam, and the birefringent element is a birefringent plate, the axis of which is directed at an angle to the beam axis.

Technical solutions are not found, the set of features which coincides with the set of features of the proposed method of forming a spatial profile of the laser beam, including distinctive features. This new set of features is a new technology that provides technical result that allows to make a conclusion on the compliance of the claimed invention, the criterion of "inventive step".

Will show in what way the above technical result.

Transformation of the original beam into a beam with a distributed aperture of the state of polarization in a convergent beam when it passes through the birefringent plate, the axis of which is directed at an angle to the beam axis, allows for the same angles of deflection of the beams from the beam axis, equivalent, equal to the distance of the rays of the primary beam from the beam axis, to create unequal conditions of changes in the polarization state, not the same as the angle between the axis dvol carelessly plate fast axis z) and the wave vector of an extraordinary ray.

It is known that the polarization properties of the polarization-selectivity of the elements used in laser technology manifest themselves differently for different directions of the polarization vector, and the angles of incidence of the radiation on the surface of the polarization-selectivity of the element. In the proposed method, a beam with a distributed polarization state of the form in a convergent beam, therefore, the individual rays of the beam falling on the surface of the polarization-selectivity of the item from different angles and, in addition, the convergence angle of the beam can be changed in the process. In this regard, to avoid unpredictable and undesirable differences in the distribution of polarization and spatial profile of the beam before and after polarization filtering converging beam to the polarizing filtration to form a collimated beam.

After passing the resulting collimated laser beam through a polarization-selectivity of the element to form a parabolic spatial profile, the same in one of the planes along the direction of propagation and all planes parallel to it across the aperture of the beam.

The formation of a beam with a distributed state of polarization can be conducted in a convergent and rhodeses the beam. Diverging beam, in contrast to convergent, does not have a plane of the minimal spot. This fact will be very useful when working with a powerful laser beam, so as not will require to avoid laser breakdown in the air, additional vacuum cuvette between the lenses of the telescope with the placement plane of the minimal spot inside her. In this case, the birefringent plate placed in the telescope of Galileo.

Figure 1 shows a diagram of a device implementing this method, where 1 is the half-wave plate, 2, 4 - lens telescope, 3 - birefringent plate, 5 - polarizer.

Figure 2 shows the spatial profiles of the laser beam obtained when implementing the inventive method.

Figure 3 shows the spatial profiles of the laser beam obtained when implementing the proposed method in the case of a rotation of the polarization vector of the source beam and the polarizer.

The method of forming the spatial profile of the laser beam is implemented as follows.

The method of forming the spatial profile of the laser beam includes the transformation of the original beam into a beam with a distributed aperture of the state of polarization in a convergent beam through the birefringent plate, the axis of which is directed at an angle to the beam axis, forming collie the new beam, polarization filtering, adjustment of the spatial profile of the beam by rotating the birefringent plate or the polarization vector of the primary beam or polarizer.

A device that implements the inventive method works as follows. Linearly-polarized beam of radiation is served on the half-wave plate 1, carrying out the rotation of the polarization vector. Converging or diverging the beam shaping lens 2. The formation of a collimated beam performed by the lens 4. Lenses 2 and 4 form a telescope. Distributed polarization state of the form, passing the beam through the birefringent plate 3, which is placed between the lenses 2 and 4, and, passing the beam through the polarizer 5, carry out the polarization beam filter. Adjusts the intensity of radiation in the center and on the edge of the parabola spatial profile of the beam is performed by rotating the half-wave plate 1 and the polarizer 5. The rotation of the birefringent plates 3 move and rotate the parabola through the aperture of the beam.

In RFNC-VNIIEF created compact laser stand, which is experimentally confirmed the efficiency of this method of forming the laser beam. Studies have shown that this method can generate laser beams with parabolic spatial profile, the same one from the PLO the bones along the direction of propagation and all planes, parallel to it across the aperture of the beam. The possibility of displacement and rotation of a parabola through the aperture of the beam, and adjusting the relationship of the level of radiation intensity in the center and at the edges of the parabola in the range from 0 to 1.

The invention will find application in high-power laser installations in which due to the uneven amplification of radiation in the close-up cascades beams are applied with a pre-formed enclosure spatial intensity profile. The invention can find application in medicine, for example in ophthalmology for laser vision correction.

Sources of information

1. Doga A.V., Semenov A.D., Snowdrifts, VA, Evsyukov A.G., Makarov A.V., Kononenko A.A. Patent RU No. 2196559, publ. 18.05.2007,

2. V.M. Van Monterghem, J.T. Salmon, R.W. Wilcox. Beamlet pulsegeneration and wavefront control system, ICF Quarterly Report 5(1), 42-51, Lawrence Livermore National Laboratory, Livermore, CA, UCRL-LR-105821-95-1 (1995).

3. Patrick A.Giordano, Patent US 2006/0023307 A1, publ. 02.02.2006,

The method of forming a spatial intensity profile of the laser beam, including the formation of the source converging the laser beam, the transformation of the initial converging the laser beam into a beam with a distributed aperture of the state of polarization through a birefringent element located between the lenses of the telescope, the polarization beam filter polarizer adjustment ol the spatial intensity profile of the beam by rotating the birefringent element, or the polarization vector of the initial converging beam, or polarizer, while the birefringent element is a birefringent plate, allowing for the same angles of deflection of the beams from the beam axis to create unequal angle between the axis of the birefringent plate and the wave vector of an extraordinary ray, which ensures formation after conducting a polarizing filter parabolic spatial intensity profile, the same in one of the planes along the direction of propagation and all planes parallel to it across the aperture of the beam.



 

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