US 12,249,802 B2
Laser device and method for operating laser device
Tetsushi Takano, Yokohama (JP)
Assigned to Nichia Corporation, Anan (JP)
Filed by NICHIA CORPORATION, Anan (JP)
Filed on Sep. 29, 2021, as Appl. No. 17/489,537.
Claims priority of application No. 2020-165045 (JP), filed on Sep. 30, 2020.
Prior Publication US 2022/0102931 A1, Mar. 31, 2022
Int. Cl. H01S 3/091 (2006.01); H01S 3/08 (2023.01); H01S 3/094 (2006.01); H01S 3/0973 (2006.01); H01S 3/081 (2006.01)
CPC H01S 3/08059 (2013.01) [H01S 3/08013 (2013.01); H01S 3/091 (2013.01); H01S 3/0973 (2013.01); H01S 3/0816 (2013.01); H01S 3/094038 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A laser device comprising:
a traveling wave type resonator comprising a first mirror and a second mirror; and
a laser medium disposed between the first mirror and the second mirror, wherein:
the first mirror and the second mirror are disposed such that round-trip light that travels in round trips in the resonator has a focus inside the laser medium;
the laser device is configured such that:
excitation light incident on the resonator is superimposed on the round-trip light at the focus and narrowed to be thinner than the round-trip light,
ZR×α<0.5 is satisfied, where ZR is a Rayleigh length of the excitation light and a is an absorption coefficient of the laser medium with respect to the excitation light, and
a round-trip Gouy phase shift of the resonator has a value excluding 2π×n/m where m is an integer of less than 15 and n is an integer of equal to or less than m.