Coherent light generators – Particular pumping means – Electrical
Patent
1991-10-02
1994-09-13
Scott, Jr., Leon
Coherent light generators
Particular pumping means
Electrical
372 83, 372 88, H01S 3097
Patent
active
053475313
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a transverse discharging excitation pulse laser oscillator apparatus including electron affinity gas, and in particular relates to the constitution of its pre-ionization electrodes.
BACKGROUND ART
FIG. 5 is a cross-sectional drawing showing a discharging electrode of a conventional transverse discharge excitation pulse laser oscillator apparatus shown for example in DOE/SF/ 90024-T2 (1977) wherein: (1) is a first main electrode; (1a) is a 1/4 inch outer diameter tube which constitutes a tip part of the main electrode (1); (2) is a second main electrode; (3) is a main discharge which is produced between main discharge (1) and (2); (4) is an auxiliary electrode comprised of a wire disposed in the vicinity of the first main electrode (1); (5) is a dielectric material pipe comprised of quartz pipe of approximately 5 mm outer diameter which is disposed in a manner that it contains thee auxiliary electrode (4) inside and contacts the first main electrode (1); (6a) and (6b) are corona discharges taking place on the surface of the dielectric material pipe; and (7a) and (7b) are corona discharge starting points.
Next, explanation is given on its action. First, upon applying a voltage across the first main electrode (1) and the auxiliary electrode (4), corona discharges (6a) and (6b) start from a points (7a) and (7b) at which dielectric material (5) and the first main electrode (1) contact each other in a manner that they cover the dielectric material pipe (5). Ultra-violet radiation is radiated from these corona discharges (6a) and (6b), thereby laser gas existing between the main electrodes (1) and (2) is pre-ionized. Subsequently, when a voltage is applied across the main electrodes (1) and (2), pre-ionized gas starts to discharge and then the main discharge (3) takes place. The laser gas is excited by this main discharge (3), thereby the laser starts to oscillate in a direction which is perpendicular with respect to the plane of sheet. Since the conventional transverse discharge excitation pulse laser oscillator apparatus is constituted as has been described above, there has been a problem that the ultra-violet radiation taking place in the vicinity of the corona discharge starting points (7a) and (7b), at which light emission caused by the corona discharge was strong, was not radiated efficiently into the space between the main discharge electrodes (1) and (2).
SUMMARY OF THE INVENTION
The present invention has been done in consideration of the problem as has been described above, light-emission amount of the ultra-violet radiation can be made strong and, in addition to that, by taking a configuration through which this ultra-violet radiation can be illuminated efficiently into the space between the main electrodes, even in the case that a strong electron affinity gas such as F.sub.2 gas is included in the laser gas, a uniform discharge can be realized., thus as a result, it purposes to obtain a transverse discharge excitation pulse laser oscillator apparatus which can oscillate with a high efficiency.
In a transverse discharge excitation pulse laser oscillator apparatus in accordance with the present invention, by making the extension length of the corona discharge long, a pre-ionized discharge is constituted in a manner that a strong part of the corona discharge is directed toward the space between the main electrodes. Owing to such the constitution, also by making the extension length of the corona discharge long, the light-emission amount of the ultra-violet radiation is enhanced, and the electrodes are disposed in a manner that the ultra-violet radiation taking place in the vicinity of the corona discharge starting point at which the light-emission amount is strong among the corona discharges can illuminate the air in the space between the main electrodes.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a side cross-sectional view showing a transverse discharge excitation pulse laser oscillator apparatus in accordance with one embodiment of the present inv
REFERENCES:
patent: 4718072 (1988-01-01), Marchetti et al.
E. Armadillo et al.; "Simple, compact, high-repetition rare XeCl laser"; Rev. Sci. Instrum, 56(5), May 1985; pp. 674-676.
Nakatani Hajime
Sugitatsu Atsushi
Jr. Leon Scott
Mitsubishi Denki & Kabushiki Kaisha
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