Title:
OPTICAL OSCILLATOR, METHOD FOR DESIGNING OPTICAL OSCILLATOR, AND LASER DEVICE
Document Type and Number:
WIPO Patent Application WO/2021/182619
Kind Code:
A1
Abstract:
An optical oscillator according to an embodiment of the present invention is provided with: a first reflection unit that reflects light of a first wavelength; a laser medium that is excited by excitation light of a second wavelength different from the first wavelength and emits the light of the first wavelength; a second reflection unit that forms, together with the first reflection unit, an unstable resonator which outputs an annular laser beam of the first wavelength; and a saturable absorption unit which is disposed between the laser medium and the second reflection unit and in which transmittance increases in accordance with absorption of the light of the first wavelength. When the power of the excitation light is denoted by Pp (kw), the inner diameter of the annular laser beam is denoted by di, the outer diameter is denoted by do, and a magnification rate m is denoted by do/di, the magnification rate m satisfies a0+a1Log(Pp)≤m≤b0+b1Pp+b2Pp
2. In the expression, a0=1.421, a1=0.10678, b0=2.8698, b1=0.79408, and b2=-0.022536 are satisfied.
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Inventors:
TAIRA TAKUNORI (JP)
LIM HWAN HONG (JP)
LIM HWAN HONG (JP)
Application Number:
PCT/JP2021/010143
Publication Date:
September 16, 2021
Filing Date:
March 12, 2021
Export Citation:
Assignee:
INTER UNIV RESEARCH INSTITUTE CORPORATION NATIONAL INSTITUTES OF NATURAL SCIENCES (JP)
International Classes:
G02F1/37; G02F1/39; H01S3/08
Foreign References:
| JPH021192A | 1990-01-05 | |||
| JPH0265282A | 1990-03-05 | |||
| JP2019167888A | 2019-10-03 | |||
| JPH01258483A | 1989-10-16 | |||
| JPH01270370A | 1989-10-27 | |||
| JPH0856027A | 1996-02-27 |
Other References:
TAIRA, TAKUNORI: "Micro-domain controlled high power laser materials", APPLIED PHYSICS, vol. 85, no. 10, 2016, pages 863 - 869
MASAKI TSUNEKANE: "High Peak Power, Passively Q-switched Microlaser for Ignition of Engines", IEEE JOURNAL OF QUANTUM ELCTRONICS, vol. 46, no. 2, February 2010 (2010-02-01), pages 277 - 284, XP011288218, DOI: 10.1109/JQE.2009.2030967
MASAKI TSUNEKANE: "High Peak Power, Passively Q-switched Yb:YAG/Cr:YAG Micro-Lasers", IEEE JOURNAL OF QUANTUM ELCTRONICS, vol. 49, no. 5, May 2013 (2013-05-01), pages 454 - 461, XP011498637, DOI: 10.1109/JQE.2013.2252327
B. LU ET AL.: "The beam quality of annular lasers and related problems", J. MOD. OPT., vol. 48, 2001, pages 1171
N. PAVELJ. SAIKAWAS. KURIMURAT. TAIRA: "High average power diode end-pumped composite Nd:YAG laser passively Q-switched by Cr4+:YAG saturable absorber", JPN. J. APPL. PHYS., vol. 40, no. 3A, 2001, pages 1253 - 1259
H SAKAIH KANT TAIRA: "1 MW peak power single-mode high-brightness passively Q-switched Nd3+:YAG microchip laser", OPTICS EXPRESS, vol. 16, 2008, pages 19891 - 19899
A. KAUSAST. TAIRA: "Giant-pulse Nd: YV04 microchip laser with MW-level peak power by emission cross-sectional control", OPT. EXPRESS, vol. 24, no. 4, 2016, pages 3137 - 3149
See also references of EP 4120014A4
MASAKI TSUNEKANE: "High Peak Power, Passively Q-switched Microlaser for Ignition of Engines", IEEE JOURNAL OF QUANTUM ELCTRONICS, vol. 46, no. 2, February 2010 (2010-02-01), pages 277 - 284, XP011288218, DOI: 10.1109/JQE.2009.2030967
MASAKI TSUNEKANE: "High Peak Power, Passively Q-switched Yb:YAG/Cr:YAG Micro-Lasers", IEEE JOURNAL OF QUANTUM ELCTRONICS, vol. 49, no. 5, May 2013 (2013-05-01), pages 454 - 461, XP011498637, DOI: 10.1109/JQE.2013.2252327
B. LU ET AL.: "The beam quality of annular lasers and related problems", J. MOD. OPT., vol. 48, 2001, pages 1171
N. PAVELJ. SAIKAWAS. KURIMURAT. TAIRA: "High average power diode end-pumped composite Nd:YAG laser passively Q-switched by Cr4+:YAG saturable absorber", JPN. J. APPL. PHYS., vol. 40, no. 3A, 2001, pages 1253 - 1259
H SAKAIH KANT TAIRA: "1 MW peak power single-mode high-brightness passively Q-switched Nd3+:YAG microchip laser", OPTICS EXPRESS, vol. 16, 2008, pages 19891 - 19899
A. KAUSAST. TAIRA: "Giant-pulse Nd: YV04 microchip laser with MW-level peak power by emission cross-sectional control", OPT. EXPRESS, vol. 24, no. 4, 2016, pages 3137 - 3149
See also references of EP 4120014A4
Attorney, Agent or Firm:
HASEGAWA Yoshiki et al. (JP)
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