摘要:
A gas discharge laser having an elongated cathode and an elongated anode with a porous insulating layer covering the anode discharge surface. A pulse power system provides electrical pulses at rates of at least 1 KHz. A blower circulates laser gas between the electrodes at speeds of at least 5 m/s and a heat exchanger is provided to remove heat produced by the blower and the discharges. In preferred embodiments at least a portion of the anode is comprised of lead, and fluorine ion sputtering of the anode surface creates the insulating layer (over the discharge surface of the anode) comprised in large part of lead fluoride. In a particular preferred embodiment the anode is fabricated in two parts, a first part having the general shape of a prior art anode with a trench shaped cavity at the top and a second part comprised of lead rich brass and disposed in the trench shape cavity.
摘要:
A fluorine gas discharge laser electrode (70) for a gas discharge laser having a laser gas containing fluorine is disclosed which may comprise a copper and copper alloy cathode body having an upper curved region containing the discharge footprint (74) for the cathode comprising copper and a lower portion comprising a copper alloy.
摘要:
The invention incorporates methods and structural changes in gas discharge lasers for minimizing wavelength chirp at high pulse rates. The major cause of wavelength chirp in high pulse rate gas discharge lithography lasers as pressure waves from a discharge reflecting back to the discharge region coincident with a subsequent discharge. During burst mode operation, the laser gas temperature in prior art lasers changes. This in turn changes the location of the coincident pressure waves from pulse to pulse, which ultimately alters the beam direction, causing the grating in the LNP to reflect back to the discharge region light at a slightly different wavelength. A solution to the problem is to include in the laser chamber structural elements to moderate or disperse the pressure waves and to maintain a constant laser gas temperature. One embodiment has a laser gas discharge chamber with baffles (70), heat exchanger (40), and a fan (38).
摘要:
A gas discharge tube such as a ring laser gyroscope includes a block. A cathode has an inwardly extending foot that engages the block. Additionally, or alternatively, an insulator is arranged to inhibit shorting between plasma in the block and a flange of the cathode.
摘要:
An extremely pure powder of an oxide of two or more metals, homogeneous at the atomic level, is shaped and compressed (for example, compacted by cold isostatic pressing) to provide greenware which is sintered to provide finished ceramic articles such as laser cathodes and electrodes for chlorine/caustic electrolysis. For example, pure mixed oxide powder consisting of La 0.7 Sr 0.3 CoO₃ is shaped to a tube, which is cold-isostatically pressed at 20,000 psi, then sintered to provide a cathode for a CO₂ laser. The starting oxides can be prepared by (1) reacting in water, soluble salts of two or more metals with quaternary ammonium carbonate; the metals being those that form water-insoluble carbonates, thereby to precipitate mixed carbonates of the metals; (2) recovering and drying the precipitate; and (3) calcining the precipitate to provide mixed metal oxides homogeneous at the atomic level and substantially free from extraneous contaminants.
摘要:
57 A hollow-cathode type metal ion laser (100) for producing white light includes a gas-filled tubular envelope (1) and a hollow-cathode (3) located within the tubular envelope (1). The hollow cathode (3) has holes (4) formed in a side wall portion thereof and a bore therein (3a). The hollow-cathode type metal ion laser preferably includes a plurality of metal-containing reservoirs (7) for diffusing vapour of the metal into the bore (3a) through the holes (4). Each of the metal-containing reservoirs (7) forms a portion of the tubular envelope (1) and is preferably disposed next to one of the holes (4). Further, each of the metal-containing reservoirs (7) preferably extends downwardly. Main anodes (5), one near each of the holes, are preferably disposed one within each of the metal-containing reservoirs (7). The tubular envelope (1) preferably includes sub-anodes (6) disposed one within each end portion (1b, 1c) of the tubular envelope (1) to confine the metal vapour within the bore (3a).
摘要:
57 A hollow-cathode type metal ion laser (100) for producing white light includes a gas-filled tubular envelope (1) and a hollow-cathode (3) located within the tubular envelope (1). The hollow cathode (3) has holes (4) formed in a side wall portion thereof and a bore therein (3a). The hollow-cathode type metal ion laser preferably includes a plurality of metal-containing reservoirs (7) for diffusing vapour of the metal into the bore (3a) through the holes (4). Each of the metal-containing reservoirs (7) forms a portion of the tubular envelope (1) and is preferably disposed next to one of the holes (4). Further, each of the metal-containing reservoirs (7) preferably extends downwardly. Main anodes (5), one near each of the holes, are preferably disposed one within each of the metal-containing reservoirs (7). The tubular envelope (1) preferably includes sub-anodes (6) disposed one within each end portion (1b, 1c) of the tubular envelope (1) to confine the metal vapour within the bore (3a).
摘要:
A gas discharge laser having an elongated cathode (84) and an elongated anode (83) with porous insulating layer (46) covering the anode discharge surface. In preferred embodiments at least a portion of the anode is comprised of lead, and fluorine ion sputtering of the anode surface creates the insulating layer (46)(over the discharge surface of the anode) comprised in large part of lead fluoride. In a particular preferred embodiment the anode is fabricated in two parts, a first part (40) having the general shape of a prior art anode with a trench shaped cavity at the top and a second part (42) comprised of lead rich brass and disposed in the trench shape cavity.