JPH05343764A - Gas laser tube - Google Patents

Abstract

PURPOSE:To prevent the electrified particles generated in a capillary from adhering onto the oscillating optical axis in a Brewster window or on mirror face. CONSTITUTION:A counter electrode 8 is provided in the vicinity of a sealing part, which has a Brewster window 5 or a mirror, and high voltage is applied. Or a magnetic field generator is arranged in place of the counter electrode 8. By these, the electrified particles from a capillary 1 are deflected, whereby the particles are prevented from adhering onto an oscillating optical axis 9. As a result, a gas laser tube can be gotten, which is compact and besides low- cost and is stable in oscillation mode and besides little in power drop.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a gas laser tube.

[0002]

2. Description of the Related Art A conventional gas laser tube has a thin tube for obtaining a gain of laser oscillation, a pair of electrodes provided at both ends of the thin tube, and a pair of one end sealed by a Brewster window or a mirror. Has a structure in which one end of each of the electrodes is vacuum-sealed, an auxiliary electrode is provided in the vicinity of the Brewster window or the mirror, and a discharge path is formed between the auxiliary electrode and the main electrode. The generated particles are blocked by the discharge, and are prevented from adhering to the mirror or Brewster window. In general, when dirt is attached to the Brewster window or the mirror, problems such as disturbance of the oscillation mode and reduction in power occur, and it is important to prevent such dirt.

FIG. 3 shows a cross section in the vicinity of the Brewster window of the conventional gas laser tube described above. As shown in the figure, the conventional gas laser tube is composed of a thin tube 1, a main electrode 2, an auxiliary electrode 4 arranged at an end of the main electrode 2 with a sealing component 3 and a Brewster window 5. The charged particles generated in the thin tube 1 are prevented from moving by the charged particles 6 generated by the discharge generated between the auxiliary electrode 4 and the main electrode 2 and do not reach the Brewster window, and the Brewster window is kept clean. Be drunk

[0004]

In this conventional structure for preventing contamination of the Brewster window or the mirror, the auxiliary electrode must be mounted in the vicinity of the Brewster window and the mirror, and between the auxiliary electrode and the main electrode. A power supply is needed to generate the discharge. Since the auxiliary electrode is attached, the sealing component 3 needs to have a certain length, which hinders downsizing of the overall length. In addition, a power source for discharging is required, which is an obstacle to cost reduction.

[0005]

In order to solve the above-mentioned drawbacks of the prior art, the present invention eliminates the auxiliary electrode and instead provides an opposing electrode near the Brewster window or the mirror to apply an electric field. , Arrange electromagnets or permanent magnets,
The charged particles generated in the thin tube are deflected and prevented from adhering to the optical path of the Brewster window or the mirror surface.

[0006]

Embodiment 1 FIG. 1 is a diagram showing Embodiment 1 of the present invention.

The electrode 7 is sealed at the end of the thin tube 1, and the sealing component 3 having the Brewster window 5 is vacuum-sealed at the other end of the electrode 7 as in the conventional case. In this embodiment, the counter electrode 8 is further provided near the sealing component 3 with the optical axis 9 interposed therebetween.
Are arranged and a high voltage is applied. When such a gas laser tube is in an oscillating state, its oscillation optical axis 9 coincides with the central axis of the thin tube. In this case, the charged particles generated in the thin tube 1 travel toward the Brewster window, but are deflected by the electric field of the counter electrode 8 and adhere to a portion deviated from the oscillation optical axis 9. Therefore, it is possible to prevent a decrease in laser oscillation mode and power.

FIG. 2 shows a sectional view of the second embodiment of the present invention. Instead of the counter electrode shown in FIG. 1, a several hundred Gauss permanent magnet 10 is arranged at the position where the counter electrode is arranged, and a mirror 11 for an optical co-oscillator is arranged instead of the Brewster window. Other than this, it is the same as the previous embodiment. First
The charged particles are deflected in the same manner as in the embodiment, and the mirror 1 is used.
1 to prevent dirt. In the second embodiment, the power supply for applying the high voltage 2 can also be eliminated, and the cost can be further reduced. The same effect can be obtained by using an electromagnet instead of the permanent magnet.

[0009]

As described above, according to the present invention, a deflector for changing the course of charged particles, that is, a counter electrode is provided near a sealed component having a Brewster window or a mirror, and a high voltage is applied. Alternatively, by arranging the magnetic field generator, there is an effect that a stain prevention mechanism for the Brewster window and the mirror, which is more compact and less expensive than the conventional method, can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of a first embodiment of the present invention.

FIG. 2 is a sectional view of a second embodiment of the present invention.

FIG. 3 is a sectional view of a conventional example.

[Explanation of symbols]

 1 Capillary Tube 2 Main Electrode 3 Sealing Component 4 Auxiliary Electrode 5 Brewster Window 6 Charged Particle 7 Electrode 8 Counter Electrode 9 Oscillation Optical Axis 10 Permanent Magnet 11 Mirror

Claims (2)

[Claims] 1. A pair of sealing components, each having a thin tube for obtaining a gain of laser oscillation and a pair of electrodes provided at both ends of the thin tube, and further having one end sealed by a Brewster window or a mirror. A gas laser tube in which one end of each of the electrodes is vacuum-sealed, and a counter electrode is arranged in the vicinity of the Brewster window or the mirror with the optical axis interposed therebetween. 2. A pair of sealing parts, each having a thin tube for obtaining a gain of laser oscillation and a pair of electrodes provided at both ends of the thin tube, and further having one end sealed by a Brewster window or a mirror. A gas laser tube vacuum-sealed at one end of each of the electrodes, wherein a magnetic field generator is arranged in the vicinity of the Brewster window or the mirror with the optical axis interposed therebetween.