Matching laser optical system for ensuring output waist size and position constancy

FIELD: physics.

SUBSTANCE: matching laser optical system is configured to ensure constancy of the size and position of the output waist during variation of the size of the input waist and comprises a laser, the beam of which, with a confocal parameter Zk, has an initial waist with radius varying in the range [hp,min; hp,max] with nominal value hp0, as well as an optical system consisting of first and second mobile components configured to form in the plane of the irradiated object, the output waist of the laser beam with constant size hp and at a constant distance L from the initial waist.

EFFECT: ensuring constant size and position of the output waist relative the initial waist.

5 dwg

 

The invention relates to optics, and more specifically to the design of laser optical systems (hereafter LOS), and can be used to develop high-quality optical systems.

In particular, for converting the laser waist (when its size is changed in a certain range) is applied matching LOS, in which the output hauling strictly coordinated with the subsequent element of the installation, the size and position of which remain unchanged. Matching LOS when changing the diameter of the entrance banners provide a constant diameter and position of the output banners and their equality in the desired values. In particular, such devices can be successfully applied in technological, medical (see, for example, [1] and similar laser installations where it is necessary to irradiate the predetermined size of the object beam of laser radiation is strictly dosed portion of energy, and color laser scan TVs when you have to link banners laser beams of three primary colors (for example: R, G, B)).

Problem management constrictions considered in many theoretical works (see, for example,, [2]-[7]), but it has many practical applications. For example, in the color laser scan the TV for the correct color of the image on Amery banners all beams must be strictly coordinated and not be changed during operation or when replacing one of the lasers. In addition, it often requires persistence provisions of output banners, i.e. it must be in the same place in space at a specified distance from the optics.

Most similar in its characteristics to the claimed invention are the ideas presented in [2] and presented in figure 1 and 2, which shows the schema matching laser optical systems, the output of which produces a shifting of the laser beam of a given size.

These systems consist of one or two components. They transform the initial shifting of the laser beam of variable size in the waist of the specified size.

Known matching system is inconvenient in operation, as when the laser are observed as random variations and systematic slow drift of its original size nominal banners. The size of the output of the banners is also changing. In this case, to provide the desired size and position of the output banners after some time, it is necessary to produce a new reinstall of the elements of the unit (laser components and LOS). And for the permanence of the output parameters banners is not enough to refocus LOS components: required additional surgery - change the configuration of the entire laser system (the offset of the laser and the longitudinal change be the deposits of all components of the optical system). This is very inconvenient because it is usually laser is the most heavy and bulky element in all of these process units. In addition, the moving components of the optical system may be required is so large that the new configuration of LOS may either not fit in the allotted dimensions for installation, or even to require moving the irradiated object. The same shift configuration LOS change all longitudinal dimensions you must do when changing a laser (for example, because of its failure).

The problem to which the invention is directed, is to develop a scheme such matching of the laser system, which would have the ability to compensate changes of the size of the original banners for just by movements in the components of the optical system.

The technical result is achieved due to the development of the laser optical system, ensuring the constancy of the size and position of the output spot upon the variations in the size of the input banners, which includes a laser beam which option confocality Zkhas original waist with a variable in the range [hp,min; hp,max] radius at a nominal value of hp0optical system consisting of the first and second moving parts, is made with a chance to view the th formation in the plane of the irradiated object output waist of the laser beam constant size h' pand at a constant distance L from the original banners while in the nominal position, the design parameters: the focal length of the first f1and the second f2system components, as well as the position of the initial banners Zp0and fussing Δ0selected in such a way that meets the conditions specified length

and the required value of a polynomial

and if any other size hpthe original banners from the range [hp,min; hp,max] the design parameters of the LOS Δ and Zpare selected so as to ensure the desired value iswhen longitudinal growth in the entire LOSand the system length L, where the parameter Zpis determined from the equation

and the parameter Δ is calculated from the relation

wherethe longitudinal magnification of the first component, LOS is calculated by the formula

,

and distances in LOS equal to

d1=f1-Zp; d2=f1+f2+Δ;

With this design is to move the laser or irradiated object is not necessary, and therefore there is no need to periodically time-consuming change to the hence, adaptation of the laser setup. The LOS parameters can always be chosen so that the moving components of the LOS will not be extremely large. While moving the optical components of the scheme is a well-established and least expensive procedure.

The novelty of the invention lies in the fact that compensation changes the size of the original banners due to small movements of the matching components of the optical system becomes possible only when a certain condition. This condition imposes a definite link design parameters of the components matching LOS. The specified condition is, in essence, divides all matching LOS, on systems with coherent circuitry, in which the relationship of structural parameters LOS is performed, and inconsistent circuitry - all other systems in which the specified communication design parameters LOS is not running. Only concerted system during operation of the installation can play a role of coordinating and support the size and position of the output banners constant with variations in the size of the original banners.

Further, the essence of the claimed invention is illustrated with engaging graphics.

Figure 1 shows the known from the prior art one-component laser matching optical system,

where Zp- the distance from the plumage is it focus F 1optical system to the input banners;

Z'p- the distance from the rear focus F'1optical system to output banners;

F1- front focus of the optical system;

F'1- back focus of the optical system;

d1- the distance from the inlet of the waist of the laser beam to the optical system;

d2- the distance from the optical system to output the banners.

Figure 2 presents known from the prior art two-component laser-matching optical system,

where Zp- the distance from the front focus F1the first component of the optical system to the input banners;

Z'p- the distance from the rear focus F'2the second component of the optical system to output banners;

F1- front focus of the first component of the optical system;

F'1- rear focus of the first component of the optical system;

F2- front focus of the second component of the optical system;

F'2- rear focus of the second component of the optical system;

d1- the distance from the inlet of the waist of the laser beam to the first component of the optical system;

d2- the distance between the components of the optical system;

d3- the distance from the second component of the optical system to output banners;

L - length m is waiting for input and output constrictions (length of the optical system);

Δ is the distance between the rear focus of the first component and the front focus of the second component of the optical system.

Figure 3 presents the claimed matching laser optical system with a variable longitudinal magnification

where Zp0- source distance from the front focus F1the first component of the optical system to the input banners;

Z'p0- the initial distance from the rear focus F'2the second component of the optical system to output banners;

F1- front focus of the first component of the optical system;

F'1- rear focus of the first component of the optical system;

F2- front focus of the second component of the optical system;

F'2- rear focus of the second component of the optical system;

d10- the initial distance from the input waist of the laser beam to the first component of the optical system;

d20- the initial distance between the components of the optical system;

d30- source distance from the second component of the optical system to output banners;

L - distance between the input and output valves (length of the optical system);

Δ0- the initial distance between the rear focus of the first component and the front focus of the second component of the optical system.

Figure 4 presents Appl is fair matching laser optical system with a variable longitudinal magnification and the position output of the banners with the necessary movement of the parts 2 and 3 of the system while reducing the nominal diameter of the original banners 5%. The initial position of the components shown by the dotted line. Other identifiers:

Zp- the distance from the front focus F1the first component of the optical system to the input banners;

Z'p- the distance from the rear focus F'2the second component of the optical system to output banners;

F1- front focus of the first component of the optical system;

F'1- rear focus of the first component of the optical system;

F2- front focus of the second component of the optical system;

F'2- rear focus of the second component of the optical system;

d1- the distance from the inlet of the waist of the laser beam to the first component of the optical system;

d2- the distance between the components of the optical system;

d3- the distance from the second component of the optical system to output banners;

L - distance between the input and output valves (length of the optical system);

Δ is the distance between the rear focus of the first component and the front focus of the second component of the optical system.

Figure 5 shows the inventive laser matching optical system with a variable longitudinal magnification and the position output of the banners with the necessary movement of the parts 2 and 3 of the system while increasing the nominal diameter of the original banners 4%.

The initial position of the components shown by the dotted line. Other identifiers:

Zp- the distance from the front focus F1the first component of the optical system to the input banners;

Z'p- the distance from the rear focus F'2the second component of the optical system to output banners;

F1- front focus of the first component of the optical system;

F'1- rear focus of the first component of the optical system;

F2- front focus of the second component of the optical system;

F'2- rear focus of the second component of the optical system;

d1- the distance from the inlet of the waist of the laser beam to the first component of the optical system;

d2- the distance between the components of the optical system;

d3- the distance from the second component of the optical system to output banners;

L - distance between the input and output valves (length of the optical system);

Δ is the distance between the rear focus of the first component and the front focus of the second component of the optical system.

In figure 3 presents matching laser optical system with a variable longitudinal magnification is provided by the constancy of the size and position of the output waist of the laser beam due to variations of the size of the input banners. The system includes a laser 1, PU is OK which is the original banner 2 option confocality Z kmatching optical system consisting of the first 3 and second 4 components and forming in the object plane 5 the shifting 6 output laser beam.

In the nominal state, the size (radius) of the original banners equal to hp0. During operation the size of the banners may vary in a small range from the minimum of hp,minto the maximum hp,max. The required size (radius) of the output banners h'pso the nominal longitudinal increase LOS - known and is equal to α0=(h'p/hp0)2. The length of the system from the source to the output of stretching is equal to L and kept constant.

In the nominal position, the design parameters: the focal length f1first and f2the second component of the system, as well as the position of the initial banners Zp0and fussing Δ0are chosen to satisfy the conditions specified length system

and the required value of the polynomial

The location of the LOS components depends on the choice of the working point (i.e. joint task two parameters: Δ and Zp), which determines how the value of a polynomial

and the system length L.

For the possibility of the specified selection parameters LOS: f1f2, Zp0The Δ 0you need to Podgornoe expression would be positive. When R<1 this is achieved by selectingbut when P>1 this condition is true for any Zp. The direct calculation of the expression (1) at a known Zkand P through the appropriate choice of f1and Zp(Zp<-Zp,krwhen P<1) you can provide any positive system length L. At this.

In addition to these conditions, you must also ensure the physical feasibility LOS when all longitudinal distances: d1(from the input waist of the laser beam to the first component); d2(between components)and d3(from the second component to the output banners)would be greater than zero.

It's enough that Zp<flwhen d1>0. If this distance d2>0, d3>0 automatically.

Thus, the design parameters of a LOS can always be chosen so as to ensure compliance with the conditions of physical realizability and conditions (1), (2) to ensure consistency of size and position of the output constriction. In the nominal position, the longitudinal distance in matching laser optical system (Figure 3) are

; .

Presented on Fig.3 optical scheme of the matching of the laser system provides for receiving the output of the banners constant diameter of 1 mm. in Addition, the system maintains a constant length from the original banners laser to the radiation plane (output banners). It is constant and equal to 500 mm

If any other size hpthe original banners from the range [hp,minhp,max] the design parameters Δ and Zpchosen to ensure (1) (maintain consistency in the position of the output banners) and (2) (to obtain the required values of the polynomialand, therefore, the permanence of the size of the output banners).

While fussing original banners Zpis determined from the solution of the equation

,

where Zk- it is known, and the LOS f, f2- previously selected.

Then, it calculates the parameter Δ ratio

Found Δ and Zpclearly define the distance in matching laser optical system (Figure 4 and 5)that for arbitrary initial banners will be equal to

d1=f1-Zp; d2=f1+f2+Δ;

Any change in the nominal diameter of the first and second components is s matching system is moved so that that ensures the constancy of the size and position of the output banners (irradiated object) relative to the original banners (laser).

The preferred application of the invention for matching the size and position of the output banners when using lasers with a large Zkis the choice of the range of variation of the parameter P values near R=1. The following is an example of the calculation of the matching LOS with length L=500 mm

Pmax=1.210 Pmin=0.999

L=500.0 mm

*************************
PαZpΔZ pd1d2d3
1.2100.101-25.7340.033406.250.93534.042415.023
1. 1910.103-38.4640.032 393.563.66434.041402.295
1.1720.104-52.6110.030379.377.81134.039388.149
1.1530.106-68.4200.029363.593.62134.038372.342
1.1330.108-86.2090.027345.7111.40934.036354.555
1.1140.110-106.4030.025325.6131,60334.34 334.362
1.095 has0.112-129.6010.023302.4154.80234.032311.166
1.0760.114-156.6980.021275.3181.89834.030284.071
1.0570.116-189.1480.019242.8214.34934.028251.623
1.0380.118-229.6770.016202.3254.87834.025211.097
1.018 0.120-284.9010.012147.1310.10234.021155.877
0.9990.122-393.5790.00638.4418.77934.01547.205
L=500.0Nd1=6.99Nd2=6.99Zp0=-25.7Zpt=-393.6dZp=-367.8

Currently, the most effective industrial use are associated with use of the invention in systems laser scanning TVs for coordination and maintenance of a constancy of size and location of the output of the banners on the deflector given aperture. For excellent color image laser TV this property is supported simultaneously in three independent channels (R, G, B).

SOURCES of INFORMATION

[1]. RF patent №2090157.

[2]. Pakhomov I.I., Qi is Ulya A.B. The calculation of the optical systems of laser devices. - M.: Radio and communication, 1986. - 140 C. (see also Pakhomov I.I., Tsibulya A.B. Computational Methods for Laser Optical Systems Design // Journal of Soviet Laser Research. - V.9. - No.3. - 1998. - New York. - P.321-429).

[3]. Gerard A., birch J.M. Introduction to matrix optics: TRANS. from English. Ed. Van. - M.: Mir, 1978. - 340 C.

[4]. Sakazov N.P., Kiryushin SR, Kuzichev V.I. Theory of optical systems. - M.: Mashinostroenie, 1992. - 447 S.

[5]. Pakhomov I.I. Calculation of conversion of the laser beam in optical systems. - M.: Moscow state technical University n.a. Bauman, 1998. - 54 S.

[6]. Wowbagger, Wonderkin. Optimization chetyrehjadernogo resonator for titanium laser // Quantum electronics, 1995, 22 (4), 350-356.

[7]. Vielikan, Vasilkov. Laser optics of neutral atomic beams // Advances in physical Sciences, January 1990, Volume 160, Issue 1.

[8]. RF patent №2149435.

Matching laser optical system (LOS), are designed to ensure consistency of size and position of the output spot upon the variations in the size of the input banners, including the laser, the beam of which option confocality Zkhas original waist with a variable in the range [hp,min; hp,max] radius at a nominal value of hp0as well as an optical system comprising first and second movable components made with the possibility of the formation in the plane of allocatenewobject output waist of the laser beam constant size h' pand at a constant distance L from the original banners while in the nominal position, the design parameters of the optical system have the following meanings: the focal length of the first f1and the second f2system components, as well as the position of the initial banners Zpand fussing Δ is chosen in such a way that meets the conditions specified length:

and the required value of the polynomial

where Zp0- the position of the initial banners in the nominal position, α0=(h'p/hp0)2, Δ0- fussing in the nominal position, and if any other size hpthe original banners from the range [hp,minhp,max] the design parameters of the LOS Δ and Zpare selected so as to ensure the desired value iswhenand the system length L, and the parameter Zpis determined from the equation:

and the parameter Δ is calculated from the relation

wherethe longitudinal magnification of the first component, LOS is calculated by the formulaand distances in LOS equal:
d1=f1-Zp; d2=f1+f2+Δ;



 

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16 cl, 8 dwg

FIELD: physics.

SUBSTANCE: optical system includes two channels, each of which consists of a collimating lens 1 and a refracting component 2, and a summation component 3, fitted behind refracting components 2 of both channels and having a surface with a polarisation coating. The channels are turned such that, the radiation polarisation planes of the lasers are mutually orthogonal and their optical axes intersect on the surface of the summation component with polarisation coating and coincide behind the summation component. The polarisation coating completely transmits radiation polarised in the plane of incidence on the given surface, and completely reflects radiation polarised in the perpendicular plane. Focal distances of the lenses, size of the illumination body in the semiconductor junction plane and angular divergence of the beam collimated by the lens are linked by expressions given in the formula of invention.

EFFECT: increased power density and uniformity of angular distribution of radiation intensity with minimum energy losses on components of the optical system and minimal overall dimensions.

9 cl, 6 dwg, 4 ex

FIELD: physics.

SUBSTANCE: device has a laser beam source, a transmitting element in form of a tube placed on the path of beam and filled with air at atmospheric pressure, and a recording unit. On both ends of the tube there are optically transparent end caps which reduce uncertainty of the spatial coordinates of the axis of the beam at the output of the tube. The tube with end caps acts as a high-Q cavity resonator and under the effect of external broad-band (white) noise, a standing wave having natural frequency and overtones is initiated in the tube, under the effect of which equalisation of optical refraction coefficients of air inside the tube takes place.

EFFECT: maximum spatial localisation of the laser beam to enable its use as an extended coordinate axis.

1 dwg, 1 tbl

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