Tunable laser

FIELD: laser engineering; tunable lasers.

SUBSTANCE: laser has case accommodating cavity incorporating active medium, output mirror, and spectral-selective element in the form of diffraction grating. Grating set up in bezel is connected through first adjusting mechanism to loose end of moving lever. Other end of the latter is locked in position by means of spherical supports in U-shaped flange connected through second adjusting mechanism to laser case. Loose end of moving lever is kinematically coupled with micrometer screw. Provision for individual and independent adjustment of dispersion plane of diffraction grating and axis of revolution of moving lever, with this position being maintained in the course of operation, ensures steady and reliable functioning of laser under all mechanical and environmental impacts.

EFFECT: enhanced, reliability, reproducibility and precision of wavelength selection.

1 cl, 3 dwg

 

The invention relates to laser technology and can be used in the development of tunable to wavelengths of lasers and spectrometric devices based on them.

Known tunable laser containing an active element with a Brewster window, the optical resonator including a wavelength-selective element can be rotated or longitudinally angular displacement, for adjustment of the laser along the lines of the spectrum. (See C-ka PCT No. 86/04746, CL H 01 S 3/1055, publ. 14.08.86,)

Despite the high accuracy of adjustment, the laser has the disadvantage as the complexity of the change processes associated with the use of a whole group of additional measuring devices, schemes comparison and signal processing.

Known tunable laser containing an active medium, a resonator, a limited diffraction grating that is installed with the possibility of changing the spatial-angular position, and intracavity adjustable aperture diaphragm. (See Guelev VG, Lesenok NS, Nevdakh CENTURIES Stable frequency tunable CO2-laser. - Journal of applied spectroscopy, 1981, CH, No. 2, s-371).

The disadvantage of laser is the complexity of the restructuring process, due to the need to regulate the aperture regardless of the setting of the diffraction grating.

The closest is to the proposed and adopted for the prototype is a tunable laser, containing the active medium, the resonator including a wavelength-selective element (diffraction grating)that is installed with the possibility of changing the spatial-angular position, and intracavity adjustable aperture diaphragm. The laser further comprises a profiled Cam, kinematically associated with the spectral-selective element, and the diaphragm is provided with a driving lever, kinematically connected with shaped pusher. (See RF patent № 2046482, CL H 01 S 3/13, publ. 20.10.95, prototype.)

The disadvantages of the prototype include the following: in the process, the drive lever significantly linearly moves (slides) in figurative and(or) direct the groove. Consequently there is an increased and uneven wear of the contacting surfaces and degrade the accuracy and reproducibility of the choice of the wavelength in the rebuild process, reduces the reliability and stability of operation of the tunable laser in terms mekhanokhimicheskikh effects.

In addition, in the process of rebuilding the wavelengths (changes in spatial and angular position of a spectral-selective element is an uncontrolled and non-monotonic change of the frequency of laser radiation, which prevents the setting to the maximum radiation power.

The objective of the invention is increation tunable in wavelength laser with high reproducibility and accuracy of the choice of wavelength, stable and reliable working conditions mekhanokhimicheskikh effects.

The technical result, which can be obtained by carrying out the invention, is separate and independent adjustment of the plane of dispersion of the diffraction grating and the axis of rotation of the movement arm relative to the optical axis of the resonator.

This technical result in the implementation of the invention is achieved by the tunable laser, containing situated in the body cavity with the active medium, an output mirror and a wavelength-selective element (diffraction grating), which is connected with a movable lever, a diffraction grating in the casing through the adjusting mechanism connected to the free end of the movable arm, the second end of which is fixed spherical bearings in the U-shaped flange, through which the second adjusting mechanism connected to the housing of the laser, while the free end of the movable lever is kinematically connected with the micrometer screw.

The connection of the diffraction grating in the casing through the adjusting mechanism with the free end of the movable lever ensures the alignment of the plane of dispersion of the diffraction grating relative to the axis of rotation of the movement arm. The optical axis of the resonator and the axis of rotation of the movement arm Shusterman relative to the third mutually perpendicular and lie in the same plane, that provides accurate and reliable alignment of the diffraction grating and the reproducibility of its position during angular rotation when rebuilding the wavelengths. Transmission of rotation of the micrometer screw, the movable lever allows you to gradually realize the change in frequency, achieving maximum radiation power.

Conducted by the applicant's analysis of the prior art, including searching by the patent and scientific and technical information sources and identify sources that contain information about the equivalents of the claimed invention, 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 from the list of identified unique prototype, as the most similar set of features analogue, has identified a set of essential towards perceived by the applicant to the technical result of the distinctive features in the claimed object 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 with the purpose of revealing of signs consistent with Otley is sustained fashion from the prototype features of the claimed invention, the results indicate that the claimed solution is not necessary for the expert in the obvious way from the prior art because the prior art defined by the applicant, not the influence provided the essential features of the claimed invention transformations on the achievement of the technical result, in particular, have been identified tunable laser, in which a more accurate tuning of the wavelength and frequency of the radiation is provided by separate and independent adjustment of the plane of dispersion of the diffraction grating and the axis of rotation of the movement arm relative to the optical axis of the resonator.

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

1 shows a tunable laser.

Figure 2 presents the spectral-selective element mounted on a movable arm, fixed in the U-shaped flange.

3 shows an additional view to figure 2.

The laser contains located in the housing 1, the resonator including an active medium 2, the output mirror 3 and the wavelength-selective element 4 (diffraction grating). The diffraction grating 4, located in the casing 5, through the first adjusting mechanism 6 connected to the free end of the movable arm 7. The second end of the concentration in the second lever 7 is fixed spherical bearings 8 in the U-shaped flange 9, through the second adjusting mechanism 10 and a supporting member 11 is connected with the body 1 of the laser. The free end of the movable arm 7 is kinematically connected with the micrometer screw 12, which includes a rod 13. The first 6 and 10 second adjusting mechanisms are identical and contain screw-rack 14 with a deformable neck 15 and three adjusting screws 16, which are located at an angle 120° relative to each other. 17 - arm kinematic connection.

Reconstruction of the emission wavelength is as follows.

The rotation of the micrometer screw 12 causes the translational movement of the rod 13, which, in turn, causes rotation of rigidly interconnected lever kinematic connection 17 and the movable arm 7, and is fixed on the last frame 5 with the diffraction grating 4. The lever 17 is in constant pragocontact engagement with the rod 13 (provides additional clamping springs - figure 1 is not shown).

The rotation of the movable arm 7 is carried out with respect to an axis O1O2passing through the centers of the spherical bearings 8 (figure 2). Spherical bearing 8 is fixed in the U-shaped flange 9, which elastoplastic through the second adjusting mechanism is connected with the supporting member 11 of the housing 1 laser, which ensures the alignment of the rotation axis O1O2using the propeller is 16 about the axis of the resonator. The diffraction grating 4 pre Shustrova so that her strokes were strictly parallel to the axis of rotation O1O2. This condition is necessary and sufficient to exclude resuscitate strokes of the diffraction grating relative to the optical axis of the resonator in the process of rebuilding the wavelengths. As a result, the alignment of the U-shaped flange 9 (i.e. the axis of rotation O1About2) relative to the optical axis of the resonator provides the necessary alignment of the diffraction grating 4 and its preservation during the rotation (i.e. realignment at wavelengths).

Tunable laser provides high accuracy and reproducibility of the selection of the emission wavelength by maintaining alignment of the diffraction grating in terms mekhanokhimicheskikh impacts. Separate and independent adjustment of the plane of dispersion of the diffraction grating relative to the axis of rotation of the movement arm and the latter with respect to the optical axis of the resonator is provided by separate adjusting mechanisms. Thus the optical axis of the resonator and the axis of rotation of the movement arm perpendicular to each other and do not lie in one plane (i.e. the spaced), the plane of dispersion of the diffraction grating perpendicular to the axis of rotation of the movement arm, and strokes, respectively, strictly p is rarely her.

Below is an example of a specific implementation of the invention.

Tunable laser type LCD 5WGT contains bit channel formed ceramic plates and metal-dielectric electrodes. The active medium (a working gas mixture of CO2:N2:He:Xe) is excited RF capacitive discharge. In the cavity formed by the output mirror of the AsGa with transmittance of 6-8% in the area of 9.2-10.8 microns and rifled reflective diffraction grating with a constant 150 PCs/mm, and the reflection coefficient in the "-1" order ~95%, a generation at the wavelength corresponding to the corner of autocollimation scheme Littrow. By changing the installation angle of the diffraction grating to achieve the generation of laser radiation of the desired wavelength. The value (reading) scale of the micrometer screw uniquely corresponds to a particular value of the wavelength (can be installed in accordance with the calibration table). The micrometer screw has a total stroke of 25 mm and is equivalent to the length of the transfer arm ~90 mm provides the desired range of angular displacement of the diffraction grating (~13°-14°) and, accordingly, adjustment of the wavelength of (a 9.2-10.8 microns). Geometrical dimensions of the discharge channel (2,2×2,2) provide single-mode generation of laser radiation. The body of the laser is made of the purpose of otautahi a U-shaped channel of the aluminum alloy of the type AD-31. The active element is made on the basis of the laser type LCD-10WG with replacement rear mirror on the communications window Brewster of ZnSe. Details of site adjustment of the wavelength of stainless steel 18CR10NITI. Decorative casing parts laser made of aluminum alloys of the type AMg. Cooling of the laser can be carried out by flowing water or built-in fans (air).

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

Tunable laser, containing situated in the body cavity including the active medium, an output mirror and a wavelength-selective element (diffraction grating), which is connected with a movable lever, characterized in that the diffraction grating in the casing through the adjusting mechanism connected to the free end of the movable arm, the second end of which is fixed spherical bearings in the U-shaped flange, through which the second adjusting mechanism connected to the housing of the laser, while the free end of the movable lever is kinematically connected with the micrometer screw.



 

Same patents:

Tunable laser // 2244368

FIELD: laser engineering; tunable lasers.

SUBSTANCE: laser has case accommodating cavity incorporating active medium, output mirror, and spectral-selective element in the form of diffraction grating. Grating set up in bezel is connected through first adjusting mechanism to loose end of moving lever. Other end of the latter is locked in position by means of spherical supports in U-shaped flange connected through second adjusting mechanism to laser case. Loose end of moving lever is kinematically coupled with micrometer screw. Provision for individual and independent adjustment of dispersion plane of diffraction grating and axis of revolution of moving lever, with this position being maintained in the course of operation, ensures steady and reliable functioning of laser under all mechanical and environmental impacts.

EFFECT: enhanced, reliability, reproducibility and precision of wavelength selection.

1 cl, 3 dwg

FIELD: laser engineering; emission-line narrowing devices built around diffraction grating.

SUBSTANCE: emission-line narrowing device has diffraction grating, master working side of diffraction grating, chamber for accommodating at least mentioned diffraction grating, helium source for blasting mentioned chamber, beam expanding device that functions to expand mentioned laser beams, turning gear for guiding mentioned expanded beam to working side of diffraction grating to select desired wavelength range from mentioned expanded beam. Method for regulating laser frequency dispersion involves guiding of gaseous helium flow to working side of diffraction grating; in the process pressure of blast gas is reduced to cut down optical effects of hot gas layer.

EFFECT: minimized thermal distortions in narrow-line lasers generating high-power and high-repetition-rate beams.

15 cl, 12 dwg

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