Method for producing gas-laser active element with internal mirrors

FIELD: producing active elements with internal mirrors for stabilized dual-frequency gas lasers.

SUBSTANCE: optical assemblies are placed prior to and after annealing in magnetic field whose cross component is perpendicular to active element axis amounting to 0 < H ≤ 50 mT. Direction of magnetic-field induced cross component is determined and mark is applied. Assemblies are positioned until marks are aligned. Optical assemblies are soldered when marks are positioned on those corresponding to alignment between directions of cross components of magnetic field.

EFFECT: enhanced stability of laser radiation polarizing properties.

1 cl, 2 dwg

 

The invention relates to the technology of active elements with internal mirrors for dual frequency stabilized gas laser and can be used in gas-discharge technology and microelectronics.

A known method of manufacturing the active elements comprising the Assembly of the shell with a electrode and optical nodes, pumping, filling and tap in sealing Brewster Windows with cement (see Varshal V.T. and other Ceramic cements and their use for soldering parts membranes, vacuum devices. - "Electronic engineering", ser, 9, 1966, s-238). The cement can improve the temperature obezvozhivanija during pumping. The Brewster Windows set the polarization of the output radiation.

The disadvantage of this method is the low yield of the products due to the low reproducibility of the process seal and reduce the radiation power, which is associated with the presence of mechanical stresses in the Windows. In addition, the disadvantages of the production of the active element should include the fact that the laser light on all modes have the same polarization, which cannot be used for stabilizing frequency without modulation of the radiation changes the length of the resonator).

A known method of manufacturing an active element with internal mirrors for dvukhchastotnogo the stabilized laser. The method consists in the manufacture of laser elements, attaching them to the inside of the shell, alignment, exhaust volume of the shell and the filling of the working gas. One of the mirrors is made photoanisotropic and is a substrate with a deposited dielectric layers. The implementation of a number of parallel grooves on the surface of the substrate or one of the dielectric layers of the mirror allows you to create the desired value of the phase anisotropy. (See auth. mon. The USSR №1639375, CL H 01 S 3/13, epubl year).

The disadvantage of this method of manufacturing an active element is the low power output of the active element, because the application of the corrugated layer with its great depth is not possible to obtain power, greatest when the length of the active element. The decrease in the depth of the layer is not possible to obtain a stable polarization of the active element.

The closest way to the claimed is a method of manufacturing an active element of a gas laser with internal mirrors, which includes the manufacture of structural elements, annealing, welding, soldering optical nodes, thermal oxidation of the cathode, the oxygen pumping volume and the filling of the working gas. Prior to Assembly of the active element, the cathode is subjected to annealing in vacuum is not worse than 5.10-5mm RT. Art. and a temperature of from 400 to 450°for the of 3-5 hours. (See Pat. Of the Russian Federation No. 2012943, CL H 01 J 9/02, epubl, prototype).

The disadvantage of this method of manufacturing an active element is the fact that the active element has a polarization often chaotic, linear or rotary, or linear unstable for each mode of laser radiation.

Thus, the polarization in the active element with internal mirrors for each of the longitudinal modes can be unstable, which does not allow the use of such active elements in the frequency-stabilized lasers. In addition, a common disadvantage of all the known methods is the low percentage yield of active elements.

The objective of the invention is to provide a method for manufacturing an active element with internal mirrors with stable polarization properties of laser radiation.

The technical result is obtained due to the effect of the magnetic field transverse component perpendicular to the optical axis of the laser, which allows you to create phase anisotropy in the active element with internal mirrors, providing a stable polarization of laser radiation.

This technical result in the implementation of the invention is achieved in that in the known method of manufacturing an active element with internal mirrors, which includes the manufacture of structural elements, annealing the Assembly, welding, soldering optical nodes, alignment, pumping and filling of the working gas, before annealing and after annealing the optical nodes of magnetic material with mirrors placed in a magnetic transverse component perpendicular to the axis of the active element field value of 0<N≤50 MT, determine the direction of induced transverse component of the magnetic field of optical nodes and make the tag, Orient the optical nodes with mirrors to match the labels, and the sealing of optical nodes is carried out while maintaining the position of the labels corresponding to the coincidence of the directions transversal components of the magnetic field.

The location of the optical nodes with mirrors before annealing and after annealing in a magnetic field, oriented perpendicular to the optical axis of the laser, orients the dipoles of the molecules of the coating of the mirrors along the magnetic field lines and sets the direction of one of the polarizations, the other polarization properties of the active medium will be orthogonal.

Conducted by the applicant's analysis of the prior art, including searching by the patent and scientific and technical information sources, has allowed to establish that the applicant is not detected similar, characterized by signs, identical to all the essential features of the claimed invention. And the definition of a unique prototype allowed us to identify a set of essential who's in relation to the technical result of the distinctive features, set forth in the claims.

Therefore, the claimed invention meets the requirement of "novelty" under the current law.

To verify compliance of the claimed invention to the requirement of inventive step, the applicant conducted an additional search of the known solutions, the results of which show that the claimed method of manufacturing an active element of a gas laser with internal mirrors is not necessary for the expert in the obvious way from the prior art, since no influence of the magnetic field with the transverse component of the optical nodes with mirrors made of magnetic material, so that creates a phase anisotropy of the active element with internal mirrors, providing a stable polarization of laser radiation.

Therefore, the claimed invention meets the requirement of "inventive step" by applicable law.

The claimed method is illustrated in figure 1 and figure 2:

- figure 1 shows the position of the polarization in the contour line gain by the change of the emission wavelength;

- figure 2 shows the dependences of the intensities of the orthogonal-polarized fashion from the detuning of the resonator.

The method is as follows.

Make constructive elements of the PE the units annealing and after annealing optical nodes, made of magnetic material, with mirrors placed in a magnetic field transverse component perpendicular to the axis of the active element, the magnetic field of 0<N≤50 MT. Magnetized nodes annealed in vacuum at t=450°C. then determine the direction of induced transverse component of the magnetic field and make a mark on the optical nodes, target nodes to match the directions transversal components (labels), then carry out the Assembly, welding and soldering of optical nodes is carried out while maintaining the position of the transversal components of the magnetic field, after which mirrors Ousterhout, the volume of the active element pump and fill the working gas.

The position and stability of the polarizations is checked by scanning the interferometer and the oscilloscope or used a Polaroid camera and a two-coordinate recorder.

Introduction magnetization and orientation of the optical nodes with mirrors allows zastabilizirovat position polarizations for each of the modes of the active element of the laser and, therefore, to use these active elements for frequency-stabilized lasers.

On Figg shows the position of the orthogonal modes of the active element with internal mirrors for sustainable polarizations; figa,unstable position polarizations; figb - jump polarizations in the heart of Kona the cheers.

The active elements having characteristics figb,g, suitable for stabilization because the frequency of Iδand Iπtake your part of the path.

Figv,and is not suitable for the stabilization of the laser.

Figure 2 shows the intensity of each of the polarizations in the restructuring contour I1N(ξ), I2N(ξ) occupy part of the circuit and, although in this case the possible frequency stabilization, however, the polarization of the laser radiation may be unstable. The dependence of I(ξ) from the detuning of the resonator (ξ) has a smooth characteristic, which allows to obtain a stable polarization.

The application of the present invention allows to increase the percentage yield of active elements for frequency-stabilized lasers at 90% and, respectively, the percentage of output devices by 90%.

Here is an example of the active element of a gas laser with internal mirrors, made the claimed method.

The length of the active element 125 mm

The diameter of the capillary - 0,8+0,05mm

Filling -1:10 tor20Ne3Not.

Optical nodes with mirrors part is subjected to application of up to 20 MT.

Annealed in vacuum at T=400-450°C.

Again part is subjected to application of optical nodes with mirrors up to 20 MT.

Determine the direction of induced transverse component of the magnetic field and make a mark on the optical node.

Orientirujutsia to match the labels.

The sealing of the nodes hold when saving tags.

The distance between the orthogonal modes ≈1100 MHz and polarization stable, which allowed to produce laser LGN-304.

Therefore, the claimed invention meets the requirement of "industrial applicability" under the current law.

A method of manufacturing an active element of a gas laser with internal mirrors, which includes the manufacture of structural elements, annealing, Assembly, welding, soldering optical nodes, alignment, pumping and filling of the working gas, characterized in that before annealing and after annealing the optical nodes of magnetic material with mirrors placed in a magnetic, with the transverse component perpendicular to the axis of the active element, a field value of 0<N≤50 MT, determine the direction of induced transverse component of the magnetic field and make the tag, Orient the nodes to match the labels, and the sealing of optical nodes is carried out at the conservation provisions labels corresponding to the coincidence of the directions transversal components of the magnetic field.



 

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