Solid-state laser system and excimer laser system

Patent metadata

Field	Value
Publication number	US-2018196330-A1
Application number	US-201815912004-A
Country	US
Kind code	A1
Filing date	Mar 5, 2018
Priority date	Oct 15, 2015
Publication date	Jul 12, 2018
Grant date	—

Abstract

A solid-state laser system may include: a solid-state laser unit configured to output first pulsed laser light with a first wavelength and second pulsed laser light with a second wavelength; a first solid-state amplifier configured to receive the first pulsed laser light, and output third pulsed laser light with the first wavelength; a wavelength converter configured to receive the third pulsed laser light, and output harmonic light with a third wavelength; a second solid-state amplifier configured to receive the second pulsed laser light, and output fourth pulsed laser light with the second wavelength; a Raman laser unit configured to receive the fourth pulsed laser light, and output Stokes light with a fourth wavelength; and a wavelength conversion system configured to receive the harmonic light and the Stokes light, and output fifth pulsed laser light with a fifth wavelength converted in wavelength from the third wavelength and the fourth wavelength.

First claim

What is claimed is:

1 . A solid-state laser system, comprising:
a solid-state laser unit configured to output first pulsed laser light with a first wavelength and second pulsed laser light with a second wavelength; a first solid-state amplifier configured to receive the first pulsed laser light, and output third pulsed laser light with the first wavelength; a wavelength converter configured to receive the third pulsed laser light, and output harmonic light with a third wavelength; a second solid-state amplifier configured to receive the second pulsed laser light, and output fourth pulsed laser light with the second wavelength; a Raman laser unit configured to receive the fourth pulsed laser light, and output Stokes light with a fourth wavelength; and a wavelength conversion system configured to receive the harmonic light and the Stokes light, and output fifth pulsed laser light with a fifth wavelength converted in wavelength from the third wavelength and the fourth wavelength.

2 . The solid-state laser system according to claim 1 , wherein
the first wavelength is in a range from 1032 nm to 1045 nm, the second wavelength is in a range from 1070 nm to 1093 nm, the harmonic light comprises fourth-harmonic light of the first pulsed laser light, the Raman laser unit comprises a diamond Raman laser unit, the Stokes light comprises second-Stokes light, and the fifth wavelength is in a range from 193 nm to 194 nm.

3 . The solid-state laser system according to claim 1 , wherein the solid-state laser unit includes:
a first fiber amplifier system including a ytterbium-doped silica fiber, and configured to output the first pulsed laser light; and a second fiber amplifier system including a ytterbium-doped silica fiber, and configured to output the second pulsed laser light.

4 . The solid-state laser system according to claim 1 , wherein the solid-state laser unit includes:
a single fiber amplifier system including a ytterbium-doped silica fiber, and configured to output the first pulsed laser light and the second pulsed laser light; and an optical device provided downstream of the fiber amplifier system, and configured to branch the first pulsed laser light and the second pulsed laser light.

5 . The solid-state laser system according to claim 4 ,
wherein the solid-state laser unit further includes: a first oscillator configured to output first seed light with the first wavelength; a first laser light generator configured to receive the first seed light, and output sixth pulsed laser light with the first wavelength; a second oscillator configured to output second seed light with the second wavelength; and a second laser light generator configured to receive the second seed light, and output seventh pulsed laser light with the second wavelength, and wherein the fiber amplifier system receives the sixth pulsed laser light and the seventh pulsed laser light.

6 . The solid-state laser system according to claim 4 ,
wherein the solid-state laser unit further includes: a first oscillator configured to output first seed light with the first wavelength; a second oscillator configured to output second seed light with the second wavelength; and a single laser light generator configured to receive the first seed light and the second seed light, and output sixth pulsed laser light with the first wavelength and seventh pulsed laser light with the second wavelength, and wherein the fiber amplifier system receives the sixth pulsed laser light and the seventh pulsed laser light.

7 . The solid-state laser system according to claim 1 , wherein the first solid-state amplifier and the second solid-state amplifier each include one of a ytterbium-doped crystal and a ytterbium-doped ceramic.

8 . The solid-state laser system according to claim 7 , wherein the first solid-state amplifier includes one or more materials selected from a group consisting of Yb:Lu 2 O 3 , Yb:LuScO 3 , Yb:ScYLO, Yb:YScO 3 , Yb:Y 2 O 3 , Yb:Lu 2 SiO 5 , Yb:Sc 2 O 3 , Yb:CaF 7 , Yb:YLF, Yb:KGW, Yb:KYW, and Yb:YAG.

9 . The solid-state laser system according to claim 7 , wherein the second solid-state amplifier includes one or more materials selected from a group consisting of Yb:Lu 2 O 3 , Yb:LuScO 3 , Yb:ScYLO, Yh:YScO 3 , Yb:Y 2 O 3 , and Yb:Lu 2 SiO 5 .

10 . The solid-state laser system according to claim 9 , wherein
the first solid-state amplifier includes one or more materials selected from a group consisting of Yb:Lu 2 O 3 , Yb:LuScO 3 , Yb:ScYLO, Yb:YScO 3 , Yb:Y 2 O 3 , and Yb:Lu 2 SiO 5 , and the one or more materials of the first solid-state amplifier and the one or more materials of the second solid-state amplifier are the same as each other.

11 . The solid-state laser system according to claim 1 , wherein the Raman laser unit includes:
an optical resonator configured to resonate the Stokes light; and a diamond crystal provided in an optical path of the optical resonator, and configured to generate the Stokes light.

12 . The solid-state laser system according to claim 11 , wherein
a thickness of the diamond crystal in a direction intersecting the optical path of the optical resonator is in a range from 0.41 mm to 2 mm, and a length of the diamond crystal in a direction of the optical path of the optical resonator is 8 mm or less.

13 . A solid-state laser system, comprising:
a solid-state laser unit configured to output first pulsed laser light with a first wavelength and second pulsed laser light with a second wavelength; a single solid-state amplifier configured to receive the first pulsed laser light and the second pulsed laser light, and output third pulsed laser light with the first wavelength and fourth pulsed laser light with the second wavelength; an optical device provided downstream of the solid-state amplifier, and configured to branch the third pulsed laser light and the fourth pulsed laser light; a wavelength converter configured to receive the third pulsed laser light branched by the optical device, and output harmonic light with a third wavelength; a Raman laser unit configured to receive the fourth pulsed laser light branched by the optical device, and output Stokes light with a fourth wavelength; and a wavelength conversion system configured to receive the harmonic light and the Stokes light, and output fifth pulsed laser light with a fifth wavelength converted in wavelength from the third wavelength and the fourth wavelength.

14 . An excimer laser system, comprising:
a solid-state laser unit configured to output first pulsed laser light with a first wavelength and second pulsed laser light with a second wavelength; a first solid-state amplifier configured to receive the first pulsed laser light, and output third pulsed laser light with the first wavelength; a wavelength converter configured to receive the third pulsed laser light, and output harmonic light with a third wavelength; a second solid-state amplifier configured to receive the second pulsed laser light, and output fourth pulsed laser light with the second wavelength; a Raman laser unit configured to receive the fourth pulsed laser light, and output Stokes light with a fourth wavelength; a wavelength conversion system configured to receive the harmonic light and the Stokes light, and output fifth pulsed laser light with a fifth wavelength converted in wavelength from the third wavelength and the fourth wavelength; and an excimer laser amplifier configured to receive the fifth pulsed laser light, and output pulsed laser light with the fifth wavelength.

15 . An excimer laser system, comprising:
a

Assignees

• Univ Tokyo
• Gigaphoton Inc

Inventors

• Kobayashi Yohei
• Ito Shinji

Classifications

• G02F1/37 Primary

  for second-harmonic generation {(G02F1/3532 takes precedence)} · CPC title

• H01S3/0078

  Frequency filtering · CPC title

• H01S3/30

  using scattering effects, e.g. stimulated Brillouin or Raman effects · CPC title

• H01S3/1608

  erbium · CPC title

• H01S3/2325

  Multi-pass amplifiers, e.g. regenerative amplifiers · CPC title