← Back to Patent Explorer
US5479428A Expired / Lapsed US ⏱️ 0.0 years remaining

Laser apparatus

Assignee: Mitsubishi Electric Corp
•
Filing: 1994-11-10
•
Granted: 1995-12-26
•
Expires: 2014-11-10
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract According to the present invention there is provided a laser apparatus capable of efficient oscillation with an excitation power source with comparatively low frequency, wherein discharge is obliquely generated within the rectangular section of a discharge space. There is also provided a laser apparatus with a pair of preliminary discharge excitation electrodes which can readily initiate discharge. There is further provided a laser apparatus capable of efficient oscillation with an excitation power source with comparatively low frequency, wherein provided is a pair of discharge excitation electrodes located in the major side direction of discharge space whose length is more than three times as long as that of minor side direction thereof. There is further provided a laser apparatus with a pair of discharge excitation electrodes whose dimension is smaller than that of a pair of dielectric plates, which apparatus can prevent undesirable discharge. There is also provided a laser apparatus with more than three discharge spaces at least one of which is given a lower electric field having the apparatus oscillate efficiently. There is further provided a laser apparatus with an improved oscillation efficiency wherein furnished are dielectric double pipes creating a substantially large discharge space.

Inventors

  • 👤 Masaki Kuzumoto
  • 👤 Yushi Takenaka
  • 👤 Junichi Nishimae
  • 👤 Kenji Yoshizawa
  • 👤 Takashi Yamamoto

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-09 21:48
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/09; H01S3/097; H01S3/0975; H01S3/02; H01S3/03; H01S3/0315; H01S3/04; H01S3/041; H01S3/05; H01S3/06; H01S3/0602; H01S3/07; H01S3/073; H01S3/076

Claims Analysis

Total Claims: 13
Claim 1
Independent Claim 92 words
A laser apparatus comprising: means defining a discharge space having a doughnut-like annular section comprising an outer pipe and an inner pipe coaxially disposed, an inner periphery of said outer pipe and an outer periphery of said inner pipe being utilized as waveguide paths for a laser beam that is output by said discharge space in a direction intersecting perpendicularly to said annular section; and two or more electrodes for applying an alternating voltage disposed in the outer periphery of said outer pipe, wherein said outer pipe is formed from a dielectric.
Claim 2
Dependent Claim 92 words
A laser apparatus comprising: means defining a discharge space having a doughnut-like annular section comprising an outer pipe and an inner pipe coaxially disposed, an inner periphery of said outer pipe and an outer periphery of said inner pipe being utilized as waveguide paths for a laser beam that is output by said discharge space in a direction intersecting perpendicularly to said annular section; and two or more electrodes for applying an alternating voltage disposed in the outer periphery of said outer pipe, wherein said outer pipe is formed from a dielectric.
Claim 3
Dependent Claim 100 words
A laser apparatus comprising: means defining a discharge space having a doughnut-like annular section comprising an outer pipe and an inner pipe coaxially disposed, an inner periphery of said outer pipe and an outer periphery of said inner pipe being utilized as waveguide paths for a laser beam that is output by said discharge space in a direction intersecting perpendicularly to said annular section; and two or more electrodes for applying an alternating voltage juxtaposed in the direction of outputting a laser beam in the outer periphery of said outer pipe, wherein said outer pipe is formed from a dielectric.
Claim 4
Dependent Claim 100 words
A laser apparatus comprising: means defining a discharge space having a doughnut-like annular section comprising an outer pipe and an inner pipe coaxially disposed, an inner periphery of said outer pipe and an outer periphery of said inner pipe being utilized as waveguide paths for a laser beam that is output by said discharge space in a direction intersecting perpendicularly to said annular section; and two or more electrodes for applying an alternating voltage juxtaposed in the direction of outputting a laser beam in the outer periphery of said outer pipe, wherein said outer pipe is formed from a dielectric.
Claim 5
Dependent Claim 18 words
A laser apparatus according to claim 1 or 2, wherein said inner pipe is formed from a conductor.
Claim 6
Dependent Claim 18 words
A laser apparatus according to claim 1 or 2, wherein said inner pipe is formed from a dielectric.
Claim 7
Dependent Claim 32 words
A laser apparatus according to claim 1 or 2, wherein said inner pipe is constituted by coating a dielectric layer on the outer periphery of a tubular body formed from a conductor.
Claim 8
Dependent Claim 13 words
A laser apparatus according to claim 5, wherein said tubular body is grounded.
Claim 9
Dependent Claim 40 words
A laser apparatus according to claim 1 or 2, further comprising, in the outer periphery of said outer pipe, electrically floated conductive members alternately disposed with said electrodes for applying a voltage, said electrodes and said conductive members being cooled.
Claim 10
Dependent Claim 17 words
A laser apparatus according to either of claims 1 to 2, wherein the inner pipe is cooled.
Claim 11
Dependent Claim 23 words
A laser apparatus according to either of claims 1 or 2, further comprising a polyphase alternating power source having more than three phases.
Claim 12
Dependent Claim 30 words
A laser apparatus according to either of claims 1 or 2, wherein said electrodes are adjacent to each other, and alternating voltages different in phase are applied to said electrodes.
Claim 13
Dependent Claim 23 words
A laser apparatus according to claim 10, further comprising an electrically floated or grounded cooling pipe disposed between electrodes adjacent to each other.

References Cited (Backward Citations)

DE392485C Cited
US4719639A Cited
US4719639B1 Cited
US4939738A Cited
US5172389A Cited
US5048048A Cited
US5220576A Cited
US5140606A Cited
US5379316A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1998-12-25 1999-06-26 1999-12-26 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2002-12-25 2003-06-26 2003-12-26 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2006-12-25 2007-06-26 2007-12-26 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag