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US4387462A Expired / Lapsed US ⏱️ 0.0 years remaining

Single-frequency stabilized laser

Assignee: Individual
•
Filing: 1981-06-16
•
Granted: 1983-06-07
•
Expires: 2001-06-16
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Abstract

Abstract A single frequency stabilized laser which is useful in long base line interferometers, optical inspection devices and other applications requiring a single-frequency laser source is provided having a cold-cathode and a hard-sill glass laser tube. A resistance coating, for example, Aquadag, covers the exterior surface of a laser tube which is mounted on a metallic base member. A small power supply which energizes the resistance coating for serving as a heater is coupled to this coating by fine wires, embedded in silver epoxy, for heating the glass laser tube to stabilize the frequency of the tube and eliminate mode changes in the operation thereof. A temperature sensor is provided for monitoring the temperature of the tube and is coupled to a temperature controller which controls the power supply for controlling the current applied to the resistance coating on the tube via the fine wires. Accordingly, the temperature of the tube is continuously monitored and controlled for stabilizing the frequency of the laser. Advantageously, the stabilized laser of the present invention is considerably less expensive than the previous commercially available stabilized lasers.

Inventors

  • 👤 Joseph Markus

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 13:45
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/02; H01S3/03; H01S3/034; H01S3/10; H01S3/13; H01S3/131; H01S3/134; H01S3/04; H01S3/041

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 130 words
A single-frequency stabilized laser having a cold-cathode, hard-sill glass laser tube comprising: a resistance coating on the exterior surface of said laser tube, a base member, means for mounting said laser tube on said base member, a power supply, means for connecting said power supply to said resistance coating on said laser tube for heating said glass laser tube to stabilize the frequency and eliminate mode changes in the operation of said laser tube, temperature sensor means mounted in said laser tube for monitoring the temperature of said laser tube, temperature controller means having said temperature sensor means connected thereto, and said temperature controller being connected to said power supply for controlling the current applied to said coating, whereby the temperature of said laser tube is continuously monitored and controlled.
Claim 2
Dependent Claim 130 words
A single-frequency stabilized laser having a cold-cathode, hard-sill glass laser tube comprising: a resistance coating on the exterior surface of said laser tube, a base member, means for mounting said laser tube on said base member, a power supply, means for connecting said power supply to said resistance coating on said laser tube for heating said glass laser tube to stabilize the frequency and eliminate mode changes in the operation of said laser tube, temperature sensor means mounted in said laser tube for monitoring the temperature of said laser tube, temperature controller means having said temperature sensor means connected thereto, and said temperature controller being connected to said power supply for controlling the current applied to said coating, whereby the temperature of said laser tube is continuously monitored and controlled.
Claim 3
Dependent Claim 29 words
The single-frequency stabilized laser as set forth in claim 1, in which said means for connecting said power supply to said resistance coating includes a conductive band of paint.
Claim 4
Dependent Claim 34 words
The single-frequency stabilized laser as set forth in claim 1, in which said base member and said means for mounting said tube on said base member are formed of metal of good heat conductivity.
Claim 5
Dependent Claim 31 words
The single-frequency stabilized laser as set forth in claim 1, wherein said temperature sensor means includes a sensor mounted directly on said resistance coating on the exterior surface of said tube.
Claim 6
Dependent Claim 28 words
The single-frequency stabilized laser as set forth in claims 1, 3 or 4, in which said temperature sensor means includes a sensor mounted on said metal base member.
Claim 7
Dependent Claim 39 words
The single-frequency stabilized laser as set forth in claim 1, in which said means for connecting said power supply to said resistance coating include a plurality of conductive connection bands encircling the tube and longitudinally spaced along the tube.
Claim 8
Dependent Claim 45 words
The single-frequency stabilized laser as set forth in claim 6, in which intermediate conductive bands encircle said tube in contact with said resistance coating and are positioned between but spaced from said connection bands for providing uniform distribution of current flow through said resistance coating.

References Cited (Backward Citations)

US3516010A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1986-06-06 1986-12-06 1987-06-07 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1990-06-06 1990-12-06 1991-06-07 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1994-06-06 1994-12-06 1995-06-07 $7700.00 Window Closed / Lapsed

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