JPH0310682Y2 - - Google Patents

Description

[Detailed description of the invention] (1) Field to which the invention pertains The present invention relates to a holding structure for mounting a glass plate that defines the polarization direction in an internal mirror type linearly polarized laser tube at the Brieuster angle.

(2) Prior Art Generally, gas laser tubes are often provided with a Brieuster window having a Brieuster angle. Particularly in external mirror type laser tubes, a window is used at the tube end, and since the optical resonator mirror is arranged independently of the laser tube, it is relatively easy to install a Brieuster window at the tube end. However, in the case of an internal mirror type laser tube, since optical resonator mirrors are attached to both tube ends, it is impossible to attach a Brieusta window to the tube ends. For this reason, in the internal mirror type, this Brieuster window is provided in the resonator to determine the plane of polarization of the laser beam in one direction. In addition, in the case of a He-Ne gas laser, in addition to light with a wavelength of 0.6328 μm, light with a wavelength of 3.39 μm is stimulated to be emitted, but by providing this Brieuster window, oscillation at 3.39 μm can be suppressed. An example of the conventional Brieuxta window holding structure in such an internal mirror type linearly polarized laser tube is shown in the first example.
- Shown in Figure 2. FIG. 1 is a cross-sectional view of the laser tube, in which 1 is a glass plate serving as a Brieuster window, 2 is a mirror located at both ends of the laser tube and constitutes an optical resonator, 3 is a bonding material for sealing the mirror, 4 is an envelope, 5 is a thin tube, 6 is a cathode, 7 is a cathode introduction rod, 8 is an anode introduction rod, 9 is an enclosure dish, 10
is a support formed by being bent at right angles to the optical axis. Here, the support 10 with the glass plate 1 assembled in the slit 11 in advance is inserted into the inclusion plate 9 until it hits the protrusion 9' at the right end of the inclusion plate 9, and then the mirror 2 is inserted into the left end. , hermetically sealed by the bonding material 3. 16 is a beam passage hole, and 12 to 14 are elastic springs for pressing the glass plate. In Figure 2, the glass plate 1 is placed on a support 10.
2 is a perspective view showing a state in which the support body 10 is to be assembled into a glass plate 1, in which the support body 10 is bent in advance at a width equal to or larger than the outer diameter of the glass plate 1 according to the shape shown by the dashed line, and is bent perpendicularly to the optical axis in the opposite direction. When the glass plate 1 is inserted from the Brieuster angle direction X, only two points P and P' come into contact with the opposing surfaces 15 and 15'. Therefore, the glass plate 1 is easily broken at the two points mentioned above, and moreover, the glass plate 1 is easily broken at the two points mentioned above.
Since the glass plate 1 tends to rotate during the insertion process until it is fitted into the glass plate 1', the direction and position cannot be determined, making assembly work difficult. In particular, the glass plate has a small outer diameter of about 5 mm, making assembly work difficult.
Moreover, if the support is expanded too much in advance, it will be plastically deformed when bent, reducing its ability to clamp the glass plate, resulting in the disadvantage that the length of the support in the longitudinal direction must be increased.

(3) Purpose of the invention In order to eliminate these drawbacks, the present invention uses a U-shaped support formed by bending at right angles to a slot bored at the Brieuster angle. Explain in detail.

(4) Structure and operation of the invention FIG. 3 shows an embodiment of the invention, and is a perspective view showing a state in which the glass plate 1 is to be assembled into the support 10. Here, the support body 10 has the unfolded shape shown in FIG. 4, and is bent at right angles to the slots 11 and 11', so that the slots 11 and 11 formed in the opposing surfaces 15 and 15' are bent at right angles to the slots 11 and 11'. The locus drawn by and 11' for bending or unfolding is on the same plane A as the glass plate.

Since the support 10 has such a bent structure, the surface 17 connecting the surfaces 15 and 15' is inclined by the Brieusta angle from the direction perpendicular to the optical axis, and accordingly, the beam passage hole 16 has an oval or elliptical shape. There is. Also, around the slots 11 and 11' that hold the glass plate 1, elastic springs 12, 12', 14,
14' is provided, as well as elastic springs 13 and 13' for restraining vertical movement.

The support 10 holding the glass plate 1 in this manner is inscribed in the enclosure dish 9 in the conventional manner, and the movement of the support body 10 is restrained by a protrusion 9' in the enclosure dish at one end and a mirror 2 at the other end, and is installed at the end of the laser tube. For this reason, in FIG. 3, the support 10 is expanded in advance to a width greater than or equal to the outer diameter of the glass plate 1 and in a direction opposite to the direction of the Brieuster angle, so that when the glass plate 1 is inserted from the Brieuster angle direction Surfaces 15 and 1
5' is contacted at the ridge lines L and L'.
Therefore, the glass plate 1 will not be damaged at the corners as in the conventional case, and the glass plate 1 will not rotate during the insertion process until it fits into the slot 11 and the direction and position will not be determined, making the assembly work easier. becomes extremely easy.

FIG. 5 shows a second embodiment of the present invention, which is a perspective view of the support 10. In this example, support 1
0 has the part indicated by the dashed line removed from the support of the first embodiment, and the surface 17 connecting the opposing surfaces 15 and 15' is perpendicular to the slots 11 and 11' drilled at the Brieusta angle. It is. For this reason,
It is possible to obtain a support having the same effects as in the first embodiment and having a short length in the longitudinal direction.

As explained above in the first and second embodiments, by using the U-shaped support formed by bending the slot perpendicular to the slot bored at the Brieuster angle, it is possible to prevent the face plate from being damaged. It is possible to obtain a glass plate holding structure that is small in size and has excellent workability, and has great practical effects.

In addition, in the above embodiments, the support body is not limited to the slot shape, the shape of the opposing surface, and the shape of the beam passage hole as shown in FIGS.
It may be polygonal, and the same effect can be obtained even if the enclosure plate is not limited to a cylinder but a polygonal cylinder.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a conventional internal mirror type linearly polarized laser tube, Fig. 2 is a perspective view of a glass plate inserted into the support shown in Fig. 1, and Fig. 3 is a first embodiment of the present invention. FIG. 4 is a developed view of the support of the first embodiment, and FIG. 5 is a perspective view of the support of the second embodiment of the present invention. It is. DESCRIPTION OF SYMBOLS 1... Glass plate, 2... Mirror, 3... Adhesive material, 4... Envelope, 5... Thin tube, 6... Cathode, 7... Cathode introduction rod, 8... Anode introduction rod, 9... ...Inclusion dish, 9'...Protrusion of inclusion dish, 10
...Support, 11, 11'...Slot, 12,
12', 13, 13', 14, 14'...elastic spring,
15, 15'... Opposing surface, 16... Beam passing hole,
17...A surface that connects opposing surfaces.

Claims (1)

[Scope of utility model registration request] In an internal mirror type linearly polarized laser tube, in which a glass plate in addition to a laser thin tube is disposed at the Brieuster angle between a pair of opposing mirrors, one surface in which a beam passage hole is drilled, and the glass plate A U-shaped part formed by bending the slot at right angles to the slot is inscribed in the enclosure plate, and the two opposing faces have slots formed at the Brieuster angle to hold the slot. A linearly polarized laser tube characterized in that one end is held by a protrusion in an enclosure dish and the other end is held by a mirror.