LASER

• US 20140177667A1
• Filed: 12/20/2013
• Published: 06/26/2014
• Est. Priority Date: 12/26/2012
• Status: Active Grant

• Current Assignee: Hon Hai Precision Industry Co., Ltd., Tsinghua University
• Original Assignee: Hon Hai Precision Industry Co., Ltd., Tsinghua University
• Inventors: ZHU, JUN, ZHU, JING-LEI, LI, QUN-QING, JIANG, KAI-LI, FENG, CHEN, JIN, GUO-FAN, FAN, SHOU-SHAN
• Granted Patent: US 9,337,607 B2
• Time in Patent Office: Days
• US Class Current: 372/99
• CPC Class Codes: H01S 3/03 of gas laser discharge tubes
• CPC Class Codes: H01S 3/0619 Coatings, e.g. AR, HR, passivation layer
• CPC Class Codes: H01S 3/08068 Holes; Stepped surface; Special cross-section
• CPC Class Codes: H01S 3/092 of flash lamp H01S3/0937 takes precedence ; flash lamps per se H01J61/80; circuit arrangements for operating flash lamps in general H05B41/30
• CPC Class Codes: H01S 3/1055 one of the reflectors being constituted by a diffraction grating
• CPC Class Codes: H01S 3/2232 Carbon dioxide (CO2) or monoxide [CO]

Abstract

A laser includes a total reflective mirror, an output mirror, a discharge lamp, and an active laser medium. The total reflective mirror, the output mirror, and the discharge lamp define a resonant cavity. The active laser medium is filled in the resonant cavity. The total reflective mirror includes a body, a metal film, and at least one microstructure. The at least one microstructure has a height and a lateral size, and both the height and the lateral size are in a range from about 0.5λ to about 2λ, while λ is a working wavelength of the laser.

Claims

1. A laser comprising:

a total reflective mirror comprising a body defining a first reflective surface, a metal film coated on the first reflective surface, and at least one microstructure;

an output mirror,

a discharge lamp, wherein the total reflective mirror and the output mirror are located on two opposite ends of the discharge lamp; and

an active laser medium;

wherein the total reflective mirror, the output mirror, and the discharge lamp define a resonant cavity, and the active laser medium is filled in the resonant cavity.

2. The laser as claimed in claim 1, wherein the at least one microstructure protrudes from the first reflective surface.

3. The laser as claimed in claim 2, wherein the at least one microstructure and the body are made of a same material and formed as one piece.

4. The laser as claimed in claim 1, wherein the metal film has a second reflective surface and the at least one microstructure protrudes from the second reflective surface.

5. The laser as claimed in claim 4, wherein the at least one microstructure and the metal film are made of a same material and formed as one piece.

6. The laser as claimed in claim 1, wherein the total reflective mirror comprises one microstructure.

7. The laser as claimed in claim 6, wherein the laser has a working wavelength λ

, and a height of the one microstructure is in a range from about 0.5λ

to about 2λ

.

8. The laser as claimed in claim 7, wherein a lateral size of the one microstructure is in a range from about 0.5λ

to about 2λ

.

9. The laser as claimed in claim 1, wherein the total reflective mirror comprises a plurality of microstructures.

10. The laser as claimed in claim 9, wherein the laser has a working wavelength λ

, and each of the plurality of microstructures has a height ranging from about 0.5λ

to about 2λ

.

11. The laser as claimed in claim 10, wherein the plurality of microstructures has a same height of 0.5λ

.

12. The laser as claimed in claim 10, wherein each of the plurality of microstructures has a lateral size ranging from about 0.5λ

to about 2λ

.

13. The laser as claimed in claim 12, wherein the plurality of microstructures has a same lateral size of 0.5λ

.

14. The laser as claimed in claim 10, wherein an interval is defined between each two microstructures, and each interval has a size ranging from about 0.5λ

to about 2λ

.

15. The laser as claimed in claim 14, wherein the intervals has a same size of λ

.

16. The laser as claimed in claim 1, wherein the active laser medium is selected from the group consisting of carbon dioxide, helium, neon, nitrogen, and carbon oxide.

17. The laser as claimed in claim 1, wherein the at least one microstructure is selected from the group consisting of cylinder, truncated cone, prism, and truncated pyramid.

18. The laser as claimed in claim 1, wherein the at least one microstructure is located close to a center of the first reflective surface.

19. A laser comprising:

a total reflective mirror comprising a body defining a first reflective surface, a metal film coated on the first reflective surface, and a plurality of microstructures, wherein each of the plurality of microstructures has a same height and a same lateral size;

an output mirror,

a discharge lamp, wherein the total reflective mirror and the output mirror are located on two opposite ends of the discharge lamp; and

an active laser medium;

wherein the total reflective mirror, the output mirror, and the discharge lamp define a resonant cavity, and the active laser medium is filled in the resonant cavity.

20. The laser as claimed in claim 19, wherein the laser has a working wavelength λ

, and both the height and the lateral size of the plurality of microstructures are in a range from about 0.5λ

to about 2λ

.