JPS62150893A - Manufacture of gas laser tube - Google Patents

Abstract

PURPOSE:To manufacture a laser tube in mass production without using an adhesive by fusion-bonding a Brewster window plate to a glass tube in the state that the plate is attracted by vacuum to an assembling jig formed at a Brewster angle. CONSTITUTION:A rectangular Brewster window plate 11 is contacted with the window plate retaining tapered surface 23 of the cylindrical portion 22 of a jig 21, evacuated therein by a vacuum pump as designated by an arrow P1 to attract fixedly the plate 11. Then, a glass tube 25 is disposed coaxially with respect to an axis C-C on the outer periphery, and the end is contacted fixedly with a pad 24. This heater 26 is operated to soften the tube 25. When it is softened suitably, the tube 25 is evacuated slightly as designated by an arrow P2. Thus, the tube 25 is deformed inside to become a window plate fixing portion 25a to obtain a gas laser tube to which the plate 11 is secured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method of manufacturing a gas laser tube, and particularly to a method of fixing a Brewster window plate and a glass tube. .

[Technical background of the invention and its problems] A gas laser tube that oscillates linearly polarized Rade light is provided with a Brewster window plate in the middle of a Rade resonator consisting of a pair of Rade mirrors. Conventionally, for example, as shown in FIG.
It is fixed with adhesive 13 while maintaining the Brewster angle θ with respect to C. A large-diameter glass tube 14 is coaxially arranged around the outer periphery, and a mirror plate 16 having a mirror 15 is fixed to the end thereof with solder glass 17. Further, as shown in FIG. 6, the structure is such that the Brewster window plate 11 is sandwiched and bonded between the separated glass tubes 14 and 14.

Such a configuration requires a glass tube whose end face is precisely cut at the Brewster angle θ, which requires many steps in mass production and makes the entire Rede tube expensive.

[Purpose of the invention]

The present invention solves the above-mentioned disadvantages and provides a method for manufacturing a gas laser tube that does not require a glass tube whose end face is formed to have a Brewster angle of 0, and therefore can reduce the number of steps even in mass production and reduce the overall manufacturing cost. It is something.

[Summary of the invention]

This invention provides an assembly in which the step of fixing a Brewster window plate to a glass tube at Brewster's angle has a cylindrical portion whose opening surface is tapered at Brewster's angle and can be depressurized by a vacuum pump. The Brewster window plate is vacuum-adsorbed and fixed to this tapered surface of the jig using a pump, and the glass tube to which this window plate is to be fixed is placed on the outside of the Brewster window plate, so that it corresponds to the Brewster window plate of the glass tube. A gas laser heats the glass tube to soften the glass tube, covers the softened portion of the glass tube over the outer surface of the Brewster window plate, and then slowly cools the glass tube to fix the Brewster window plate to the glass tube. This is a method for manufacturing tubes.

As a result, if there is an assembly jig shaped to the Brewster's angle, there is no need to form any angle on the glass tube, and the gas laser tube with the Brewster window plate fixed at the accurate Brewster's angle can be created with relatively simple assembly. can be obtained.

[Embodiments of the invention-]

Examples thereof will be described below with reference to the drawings.

Identical parts are designated by the same reference numerals.

As shown in FIG. 1, one assembly jig 21 has a window plate receiving cylindrical part 22 made of metal, and a window plate receiving tapered surface forming a Brewster angle θ with respect to the central axis C-C at the tip thereof. An opening surface consisting of 23 is formed. Further, a pad made of hard rubber is fitted to the outer periphery of the base of the window plate receiving cylindrical portion 22.

The inside of this chamber A21 can be depressurized by a vacuum pump (not shown).

Therefore, first, the rectangular Brewster window plate 11 is still in contact with the window plate receiving tapered surface 23 of the cylindrical part of the jig, and the internal pressure is reduced as shown by the arrow P1 using a vacuum pump, and the Brewster window plate 11 is fixed by suction. . As a result, the Brewster window plate 11 is aligned with the axis C.
-C is positioned while maintaining the Brewster angle θ.

Next, a glass tube 25 is placed on the outer periphery thereof coaxially with respect to the axis C--C, and its end surface is placed against the pad 24 and fixed. Further, a heating device 26 such as a sheathed heater is arranged on the outer periphery of the glass tube 25 at a position corresponding to the Brewster window plate 1 . Then, the heating device is activated to soften the glass tube 25. When the glass tube 2 reaches a suitable softened state,
5 is slightly depressurized as shown by arrow P2.

Thereby, the glass tube 25 is deformed inward to cover the corner portion of the Brewster window plate 11.

In this state, the pressure reduction and heating inside the glass tube 25 are stopped,
Cool slowly. Thereafter, the vacuum inside the jig is also stopped, and the glass tube 25 to which the Brewster window plate I is fixed is removed from the jig 2.

Then, as shown in FIG. 2, a mirror plate 16 with a Lede mirror 15 is attached directly to the opening end of the glass t25, and the solder is applied to the lath 1.
7 to ensure airtight fixation. In this way, as shown in the same figure and FIG. 3, a gas laser tube is obtained in which the Brewster window plate 1 is fixed by the window plate fixing portion 25a of the glass tube 25 while maintaining the Brewster angle θ. In the figure, reference numeral 25b indicates a deformed portion of the glass tube 25, and 27 indicates a vent hole between the Brewster window plate 11 and the glass tube 25. In this way, a gas laser tube is completed in which the Brewster window plate 1 is fixed to the lath tube 25 while maintaining the Brewster angle θ without using adhesive or the like.

The embodiment shown in FIG.
is placed inside the lath tube 25, the glass tube 25 is softened and deformed, and the glass tube 25 is fixed so as to cover the entire circumference with the window plate fixing portion 25th. In this case, it is desirable to form a small ventilation hole or slit in a portion K of the outer periphery of the Brewster window plate 11 to communicate the inside of the glass tube 25.

〔Effect of the invention〕

As explained above, according to the present invention, the Brewster window plate can be fixed in the glass tube without using adhesive or the like by using the assembly jig whose opening end face is formed at Brewster's angle, which improves workability in mass production. This is excellent and can reduce the manufacturing cost of Lede tubes. Furthermore, since no adhesive is used to fix the Brewster window plate, it is possible to heat it to a relatively high temperature, increase the exhaust temperature, and manufacture a Rede tube with excellent characteristics.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of essential parts explaining one embodiment of the present invention;
FIG. 2 is a cross-sectional view of the main part showing the completed state, FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. 2, and FIG. FIG. 5 and FIG. 6 are longitudinal cross-sectional views of essential parts, respectively, for explaining the prior art. 11... Brewster window plate, 21... Assembly jig, 2
2... Window plate receiving cylindrical part, 23... Window plate receiving chi/four sides, 25... Glass tube, 26... Heating device. Applicant's agent Patent attorney Takehiko Suzue 21 (罎扛性#) Figure 1 Figure 2 Figure 4

Claims (1)

[Claims] A method for manufacturing a gas laser tube including a step of fixing a Brewster window plate to a glass tube at Brewster's angle, the method comprising: a cylindrical portion having an opening surface formed in a tapered surface at Brewster's angle; Then, the pressure is reduced by the pump and the Brewster window plate is adsorbed and fixed to the tapered surface of the assembly jig that can be depressurized by the vacuum pump, and the glass tube to which the window plate is to be fixed is placed outside of the Brewster window plate. The glass tube is heated at a position corresponding to the Brewster window plate to soften the glass tube, the softened portion of the glass tube is covered with the outer surface of the Brewster window plate, and then the glass tube is slowly heated. A method for manufacturing a gas laser tube, which comprises cooling and fixing a Brewster window plate to a glass tube.