The method of manufacture of the unit prisms of the modulator of the laser operating on the effect of violations of total internal reflection

 

The method includes grinding, polishing, surface cleaning and Assembly of prisms. After cleaning the surfaces of the large base of the prisms is not less than 15 is exposed to radiation, vacuum ultraviolet (VUV) range with a wavelength of 100-200 nm, and then a larger base of one of the prisms is impregnated with a solution of an organic or inorganic surface modifier. The prism with the applied solution is dried within 2-10 min at 225oC. After drying, the prism again cleaned with an organic solvent, put into contact with each other in large grounds and Ousterhout relative to each other by the application of tangential efforts of 0.1-0.5 kg/cm2to achieve a given color hue of the working gap between the prisms and the specified dimensions of the unit prisms. The concentration of the surface modifier is determined by the empirical expression in the claims. Is a simplification of the manufacture of the unit prisms, increased service life and the possibility of restoration of substandard units. 5 C.p. f-crystals, 5 Il.

The present invention relates to an optical instrument, in particular to the technology of manufacturing the e modulators optical radiation.

A known method of manufacturing prisms [1], in which pre-treated prism, made in the form of truncated pyramids, put reflective vacuum coating based on aluminum at the same time reflecting on the faces and on one of the joined surfaces. Prism pairs is brought into contact, Ousterhout, heated to 300-400oWith, to the point of contact and one of the joined parts applied voltage 300-800 In within 1-3 min, relieve tension and cool the Assembly to subzero temperatures with a speed of 1-5o/min by placing in a heat chamber at 1-2 o'clock

The disadvantages of this method include: 1. the need to use vacuum installations for the application of aluminum, which increases the process and lengthens the cycle parts manufacturing; 2. the need for cooling parts to freezing temperatures, which also increases the cost and lengthens the manufacturing process; 3. uncontrolled alignment is poor prisms when heated to 300-400oWith and the application of an electrical voltage.

The closest technical solution to the proposed technological solution is the connection method prisms [2], which consists in cleaning the surfaces to be glued, the glue is applied onto the lower part and the second pattern of mutual orientation of the connected parts, controlled by the number and location of interference fringes, and drying glue.

The disadvantages of the prototype are: 1. the considerable thickness of the adhesive - 2-3 μm, which makes it impossible to create optical gates with a working gap between the prisms at the level of 1000-3000 And; 2. no optical contact between the prisms and the presence between them of the adhesive layer causes a hit in the working gap of the products of the polymerization of the adhesive, which reduces the transmittance of the optical shutter and its service life because of the increased likelihood of collapse of the surfaces of the prisms forming the gap during operation of the modulator.

The main task, which is aimed invention is the simplification of the manufacture of the optical unit of the two prisms forming the modulator optical radiation and increase its service life and enabling restoration of nonconforming optical prismatic blocks with the original accuracy of the relative orientation of the prism block.

To solve this problem is proposed a method of manufacture of the unit prisms, which, like the prototype, includes grinding, polishing, cleaning of the surfaces of the elements and the connection between them.

Th is e less than 15 are exposed to radiation, vacuum ultraviolet (VUV) range with wavelength, lying in the range of 100-200 nm, then large grounds are cleaned with an organic solvent, and one of them put a solution of organic or inorganic surface modifier concentration10 wt.%, this prism is kept on the air for 2-10 min at room temperature, after which the prism is again clear, impose on each other and pre-Ousterhout in given dimensions by the application of tangential specific efforts0.1 to 0.5 kg/cm2and to obtain the given color hue of the gap between the prisms observed in reflected from it the light at angles close to the angle of total internal reflection, then the assembled unit is exposed to vertical compressive efforts to appear on the outer perimeter of the working gap between the prism zone of the black color, indicating the occurrence of optical contact between the contacting surfaces of the prism block.

The essence of the proposed method of manufacture of the unit prisms, working on the effect of violations of total internal reflection (ATR), is that after polishing and cleaning of working surfaces of the prisms of their large base is subjected to irradiation is Eva thereby conditions for the subsequent filling of the surface of the pores due to capillary effect applied to one of the prisms modifier. After drying a portion of the modifier remains in the pores due to the strength of the electrostatic interaction, reduces roughness Rzsurface, increasing the area of mutual contact with the surface of the other prism, and thereby provides greater strength of their connection and increases the service life of the modulator; in addition, the surface modifier to the polymerization allows you to pre-align the prisms relative to each other, eliminating uncontrolled in time the phenomenon of "setting" two polished optical surfaces, thereby providing the possibility of a restoration of nonconforming optical blocks prisms with preservation of the originally specified accuracy of their relative orientation.

The method of manufacture of the unit prisms of the modulator operating on the effect of ATR, illustrated by the drawing, which shows: Fig.1 - prism unit with a modifier of Fig.2 and 3, the unit prisms with preliminary alignment; Fig.4 - final Assembly of the optical shutter of Fig.5 is a view of the perimeter of the working gap occurs when the optical contact between the prisms.

The unit prisms includes the prism 1, in particular, a pyramidal shape, and the prism 2 TRUST with polished poverhnosti 4 prism 2 when connecting the working gap of the unit prisms (optical shutter), having at its outer perimeter zone of the black color 6 at the time of forming the optical contact of the prisms 1 and 2.

The proposed method is as follows.

Joined prisms 1 and 2 in Fig.1 are subjected to standard cleaning procedure. After that, the surface of large bases 3 prisms 1 and 2 are exposed to vacuum ultraviolet radiation (VUV) range with a wavelength of 100-200 nm is not less than 15 C. After that, the exposed surface is cleaned with an organic solvent, for example acetone, and on the surface 3 of one of the prisms, for example 1, put10 wt.% the solution of organic or inorganic surface modifier, the concentration of "K" which is given by the empirical expression K = Rz[A]/20where Rzthe surface roughnessand binder contains 0.5 to 5 wt.% and the solvent 95,5-95 wt.%, due to the capillary effect fills all its roughness. Used surface modifier does not contain water and hydroxyl groups in free or bound state, thereby providing the advantage of filling the porous surface of the binder, which is in its composition.

After drying both prisms newly cleaned with an organic solvent and are connected with large grounds.

Application tangential effort FTangto one or both prisms in accordance with Fig.2 achieve a given color hue of the working gap between the prisms observed in reflected from it the light at angles close to the angle of total internal reflection (Fig.2) and to obtain the required dimensions of the block with a given accuracy (FTang<0,1 - 0,5 kg/cm2.

Easily adjusted so the unit prisms subjected to vertical compressive effort FVert(Fig.3) until the zone black zone of the optical contact that occurs on the outer perimeter of the working gap between the prisms.

Thus, the proposed method of manufacture of the unit prisms allows to reduce the cost of technological process of Assembly of the unit prisms, makes it controlled at all stages, allows the restoration of defective blocks, which gives the opportunity to use it widely in optical instrumentation, including laser systems, modulation of light.

Sources of information 1. USSR author's certificate 1515128, CL G 02 In 5/04, 1989.

2. USSR author's certificate 1631491, CL G 02 In 5/122, 5/04, 1991 prototype.


Claims

1. the internal reflection of light, including grinding, polishing, surface cleaning and Assembly of prisms, wherein after cleaning the surfaces of the large base of the prisms is not less than 15 is exposed to radiation, vacuum ultraviolet (VUV) range with a wavelength of 100-200 nm, and then a larger base of one of the prisms is impregnated with a solution of an organic or inorganic surface modifier.

2. The method according to p. 1, characterized in that the prism with the applied solution is dried within 2-10 min at 225oC.

3. The method according to p. 1, characterized in that after drying prism newly cleaned with an organic solvent and put into contact with each other in large grounds.

4. The method according to p. 1, characterized in that the prism block Ousterhout relative to each other by the application of tangential efforts of 0.1-0.5 kg/cm2to achieve a given color hue of the working gap between the prisms and the specified dimensions of the unit prisms.

5. The method according to p. 2, characterized in that the concentration of the surface modifier is determined by the empirical expression, wt.%:


where Rzthe surface roughness.

6. The method according to p. 2, great

 

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