DE2224046A1 - Spacer for an optical apparatus of circular cylindrical shape, which has a support edge at both ends - Google Patents

Description

PHN.5645 Va / PP

Dr. Herbert Schott Patent attorney

Applicant: ti. Y. Philips * Gioeilampenfabnekeo
File No., PHN-5645

A. message from May 15, 1972

"DiatanzkSrper for a« ptical apparatus of circular cylindrical shape which has a support edge at both ends ".

The invention relates to a spacer

for an optical apparatus of circular cylindrical shape made of glass, Quartz «which consists of a ceramic material and which is at both ends has a laser edge for part of the opteichen system, which “support edges deliver in mutually parallel planes perpendicular to the axis of the spacer bell.

Such spacers are used in interferometers »and also used in lasers.

In the in "Physics Letters» 2 (No. 7), pp. 34.0-341 1

1962 and in the dissertation by J.Haiemas "Construction and properties • are the lasers described for stable gas lasers "(Utrecht 1966)

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PHN. 5645

di · the flat surfaces on which the flat reflector plates are blasted. The contact areas are with a tolerance of 4 seconds parallel to one another and the surfaces that are blasted onto one another are ground flat within a tele-tolerance range of 0.2 μm. The length of the laser body is 12 cm and the diameter is 3.5 cm. the The required high precision of the construction is dependent on the used related flat reflector plates. The production of such a Construction is complex and expensive.

Such are lasers for the infrared range with a

Wavelength of about 10.6 / um known (see Dutch laid-open specification 6607472), in which the discharge takes place within a quartz tube with a length ven 2 m and a diameter of 23 mm in a gas mixture _{partially consisting of CO 2.} At the ends of the quartz tube reflectors are attached, which are formed by a hollow aluminum mirror coated with gold with a radius of curvature of 2.5 ■ or by a flat germanium plate with a thickness of 2 mm. In the patent application mentioned, it is not specified how the mutual parallelism of the ends of the quartz tube on which the reflectors rest is maintained.

The invention has a purpose, a construction with

to create parallel support edges, which are easy and Can be produced relatively cheaply.

In an optical apparatus with a circular cylindrical Spacers made of glass, quartz or a ceramic material, and which has oinon bearing edges at both ends for parts of the optical system, which bearing edges are in mutually parallel planes are perpendicular to the Aohse of the spacer, according to the invention the support edges through the circular intersection of two

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ground at each end of the spacer with respect to this Body of centered, oppositely directed, conical surfaces formed, which include an obtuse angle with each other.

As a result, when sanding the two support edges the same centering in relation to the distant body is maintained, automatically cut circular lines in planes perpendicular to them of the centering tubes that run parallel to each other and are in wind centered in relation to the centering axis

The bearing edges formed in this way can

can be used for flat, concave and convex K bodies and are suitable for use with confocal and semi-confocal lasers, as well as interferometers.

TJm to avoid too sharp and crumbling support edges, the half point angle of each of the conical surfaces is preferably selected to be greater than or equal to 60. An improvement in this one Respect can still be achieved by using the two half peak winek equal to 60 to. 75 can be chosen and a third tapered surface is ground that intersects the other two surfaces and a half apex angle greaser equal to or greater than 80. It should be ensured that the third surface does not touch the surface of the concave or covexon body to be placed.

When sanding the support edges, a simple one is sufficient

SchleiEbank with satisfying looking pointed ceilings. It is then at Lengths of 1 to 2 m dos distance body easily a parallelism of the Support edges reached within a tele-tolerance range of 15 arc seconds. The position of the support edges in relation to the center axis is then vertically within a tolerance range of about 1 arc minute.

The support according to the invention also forms the counter-

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was a patent application filed separately and at the same time, which refers to a gas discharge laser in which »the discharge takes place in a» helium-neon mixture (PHN.5644) ·

The invention is explained in more detail below for an exemplary embodiment with reference to the drawing. Show it

1 shows an axial section through a confocal interferometer,

Figures 2 and 3 some "" similar embodiments of the Support edges,

4 shows a section through a semiconfocal interferometer, and

5 shows a section through a laser for a wavelength of 10.6 μm,

In Fig. 1 is a quartz cylinder 1 with a length of

5 cm and a diameter of 2 cm provided with double-conical support edges at both ends. The hollow quartz mirrors 2 and 3 each have a radius of curvature of 5 cm. In Fig. 2, the conical surfaces 4 and 5 »on the line of intersection of which the mirror 2 rests, each holding an apex angle of 65 *. InFig. 3 is half the point angle of surfaces 6, 7 and 8 60 ^# , 80 * nzw. 70 *.

The spacer 9 in FIG. 4 again has a diameter of 2 cm and a length of 5 cm; the hollow mirror 11 has a radius of curvature of 10 om. The mirror 10 is flat. In Fig. 12, denotes a quartz tube with a length of 2 m and a diameter of 18 mm · The concave mirror 13 is provided with a gold finish I4. The second reflector is a flat germanium plate 15 with a thickness of 2 mm. The reflectors 13 and 15 lie on double-conical support edges 16 and 17 · The electrodes are labeled 18 and 19. the

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Gas filling of the Rehres "consists of 2.5 Torr CO ₂ , 2 T * rr N ₃ , 0.2 Terr H ₃ O and 10 T» rr He. "With a current through the Rehr ν · η 40 mA below a Operating voltage of Η kV emerges from the window 15 a bundle of rays with a wavelength of 10.6 / u »and a power of 60 W

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Claims (1)

- " ^ - PHN. 5645 PATENT CLAIMS * Spacer for an optical apparatus of circular cylindrical shape Shape, which consists of glass, quartz or a ceramic material and which has a support edge at both ends for parts of the optical Systems owns which Afiflagänder in mutually parallel planes are perpendicular to the axis of the spacer body, characterized in that the support edges through each of the circular intersection line between formed at each end of the spacer body ground, with respect to this body centered, oppositely directed conical surfaces that enclose an obtuse angle with one another. S. spacer according to claim 1, characterized in that that it is used for a confocal interferometer. 3. Spacer according to claim 1, characterized in that that it is used for a semi-confocal interferometer. 4. Spacer according to claim 1, characterized in that it is used for an infrared laser with a discharge tube is provided with the support rims at the ends of the discharge tubes are. 209850/0775