Fluid laser having a roughened, catalytic inner surface

• US 5,337,329 A
• Filed: 07/07/1992
• Issued: 08/09/1994
• Est. Priority Date: 07/07/1992
• Status: Expired due to Fees

• Current Assignee: Universal Laser Corporation
• Original Assignee: Universal Laser Corporation
• Inventors: Foster, Jack
• Primary Examiner(s): Davie, James W.
• Application Number:
  US07/911,679
• Time in Patent Office: 763 Days
• Field of Search: 372/33, 372/59, 372/61, 372/87
• US Class Current: 372/61
• CPC Class Codes: B01J 37/0217 Pretreatment of the substrate before coating
• CPC Class Codes: H01S 3/036 Means for obtaining or maintaining the desired gas pressure within the tube, e.g. by gettering, replenishing; Means for circulating the gas, e.g. for equalising the pressure within the tube H01S3/031 takes precedence

Abstract

A laser having a roughened, catalytic surface to regenerate fluid within the lasing chamber that decomposes during operation of the laser. The roughness of this surface greatly increases its surface area thereby greatly increasing the rate of action of this catalytic surface in regenerating fluid. This structure is particularly useful in producing small, handheld CO₂ lasers.

Claims

1. A laser comprising:

a wall encircling a laser chamber;

means for producing an electrical discharge within said chamber;

a reflector structure adapted to reflect light in a path that produces lasing of a fluid within said laser chamber; and

a roughened, catalytic surface, that has been roughened by attachment of particles and then coated with a layer of catalytic material to increase an amount of area of this catalytic material that is in contact with said fluid to catalyze recombination of a portion of this fluid that has decomposed within said chamber.

2. A laser comprising:

a wall encircling a laser chamber;

means for producing an electrical discharge within said chamber;

a reflector structure adapted to reflect light in a path that produces lasing of a fluid within said laser chamber; and

a roughened, catalytic surface, that has been roughened by ablation and then coated with a layer of catalytic material to increase an amount of area of this surface that is in contact with said fluid to catalyze recombination of a portion of this fluid that has decomposed within said chamber.

3. A laser as in claim 2 wherein said roughened, catalytic surface is pitted.

4. A laser as in claim 2 wherein said roughened, catalytic surface is roughened by at least one groove cut into this surface.

5. A laser as in claim 4 wherein said roughened, catalytic surface comprises:

an inner surface of a sidewall of said laser in which grooves have been cut to produce a plurality of pyramidal regions.

6. A laser as in claim 5 wherein said grooves are in the form of randomly intersecting spiral grooves.

7. A laser comprising:

a wall encircling a laser chamber;

means for producing an electrical discharge within said chamber;

a reflector structure adapted to reflect light in a path that produces lasing of a fluid within said laser chamber; and

a roughened, catalytic surface, that has been roughened by application of a coating of catalytic material containing particles of diameter in the range from 0.1 to 10 microns.

8. A laser comprising:

a wall encircling a laser chamber;

means for producing an electrical discharge within said chamber;

a reflector structure adapted to reflect light in a path that produces lasing of a fluid within said laser chamber; and

a roughened, catalytic surface, that has been roughened by application of a coat of lumpy catalytic material.

9. A laser comprising:

a wall encircling a laser chamber;

means for producing an electrical discharge within said chamber;

a reflector structure adapted to reflect light in a path that produces lasing of a fluid within said laser chamber; and

a roughened, catalytic surface, that has been roughened by

application of a layer of material that has been processed to form a roughened surface; and

a coating of catalytic material on a top surface of said roughened surface.

10. A laser as in claim 9 wherein said layer of roughened material is selected from the class consisting of activated charcoal, zeolite and sol gel.

11. A laser as in claim 10 wherein said layer of material that has been processed to form a roughened surface is attached to an inner surface of said sidewall of said laser.