High power ultra-short laser device

Patent metadata

Field	Value
Publication number	US-9431785-B2
Application number	US-201414264307-A
Country	US
Kind code	B2
Filing date	Apr 29, 2014
Priority date	Jan 23, 2014
Publication date	Aug 30, 2016
Grant date	Aug 30, 2016

Abstract

Disclosed is a high power ultra-short pulsed laser device increasing pulse energy by using resonators. A pulsed laser device may comprise a first resonator making a pump beam resonate primarily and passing the pump beam which resonated through a first output mirror; and a second resonator comprising a first multiple reflection mirror and a second multiple reflection mirror. Also, the first multiple reflection mirror includes at least one first small area mirror, and the second multiple reflection mirror includes at least one second small area mirror, and the second resonator makes the laser beam delivered from the first resonator resonate by reflecting the laser beam repetitively. Therefore, the pulsed laser device may increase pulse energy without using a multi-stage amplifier so that a high power ultra-short pulsed laser beam can be generated.

First claim

What is claimed is:

1. A high-power ultra-short pulsed laser device comprising:
a first resonator making a pump beam resonate primarily and passing the pump beam which resonated through a first output mirror; and
a second resonator comprising a first multiple reflection mirror and a second multiple reflection mirror,
wherein the first multiple reflection mirror includes at least one first small area mirror positioned in the first multiple reflection mirror, and the second multiple reflection mirror includes at least one second small area mirror positioned in the second multiple reflection mirror, and the second resonator makes a laser beam delivered from the first resonator resonate by reflecting the laser beam repetitively.

2. The laser device of claim 1 ,
wherein at least one first gap is formed in the first multiple reflection mirror, and at least one second gap is formed in the second multiple reflection mirror, and
wherein the at least one first small area mirror is positioned in the at least one first gap, and the at least one second small area mirror is positioned in the at least one second gap.

3. The laser device of claim 1 , wherein the first resonator comprises a focusing lens focusing the pump beam, a first gain medium through which the pump beam focused by the focusing lens passes, a first curved surface mirror, a first reflection mirror, a second reflection mirror, a second curved surface mirror, and a third reflection mirror which make the laser beam which passed through the first gain medium be reflected or retroreflected sequentially.

4. The laser device of claim 1 , further comprising a pump laser generating the pump beam.

5. The laser device of claim 1 , wherein the laser beam which is made resonate primarily by the first resonator is reflected on a fourth reflection mirror, and delivered to one of the at least one second small mirror, and reflected repetitively between the first multiple reflection mirror and the second multiple reflection mirror.

6. The laser device of claim 1 , wherein the first multiple reflection mirror and the at least one first small area mirror are plane reflection mirrors, and the second multiple reflection mirror and the at least one second small area mirror are curved surface reflection mirrors.

7. The laser device of claim 2 , wherein the laser beam which is reflected finally on the second multiple reflection mirror passes through one of the at least one first gap and is delivered to the second output mirror.

8. The laser device of claim 7 , further comprising a second gain medium through which the laser beam which passed through the second output mirror passes, a third curved surface mirror, a fourth curved surface mirror, and a fifth curved surface mirror which reflect or retroreflect the laser beam which passed through the second gain medium sequentially.

9. The laser device of claim 7 , further comprising additional resonator which makes the laser beam which passed through the second output mirror resonate by reflecting the laser beam repetitively,
wherein the additional resonator has a same configuration with the second resonator.

10. The laser device of claim 2 , wherein the at least one first through-hole and the at least one second through-hole have shapes of U or V.

Assignees

• Electronics & Telecommunications Res Inst
• Gwangju Inst Science & Tech

Inventors

• Song Dong Hoon
• Ko Do Kyeong
• Shin Dong Ho
• Lee Hwang Woon
• Jung Moon Youn
• Cho Won Bae

Classifications

• H01S3/094038

  End pumping · CPC title

• H01S3/1112

  Passive mode locking · CPC title

• H01S3/0811

  incorporating a dispersive element, e.g. a prism for wavelength selection · CPC title

• H01S3/0813

  Configuration of resonator · CPC title

• G02B5/09

  Multifaceted or polygonal mirrors {, e.g. polygonal scanning mirrors; Fresnel mirrors} · CPC title