US 12,341,320 B2
Optical combiner and laser apparatus
Ryokichi Matsumoto, Chiba (JP); Tomoyuki Fujita, Chiba (JP); and Kiwamu Suzuki, Chiba (JP)
Assigned to FUJIKURA LTD., Tokyo (JP)
Appl. No. 17/927,266
Filed by FUJIKURA LTD., Tokyo (JP)
PCT Filed Feb. 19, 2021, PCT No. PCT/JP2021/006257
§ 371(c)(1), (2) Date Nov. 22, 2022,
PCT Pub. No. WO2021/240916, PCT Pub. Date Dec. 2, 2021.
Claims priority of application No. 2020-091710 (JP), filed on May 26, 2020.
Prior Publication US 2023/0208109 A1, Jun. 29, 2023
Int. Cl. H01S 3/30 (2006.01); H01S 5/14 (2006.01); H01S 5/40 (2006.01); G02B 6/028 (2006.01); G02B 6/036 (2006.01); H01S 3/23 (2006.01); H01S 5/02251 (2021.01)
CPC H01S 5/4012 (2013.01) [H01S 5/147 (2013.01); G02B 6/0281 (2013.01); G02B 6/03622 (2013.01); H01S 3/2383 (2013.01); H01S 5/02251 (2021.01)] 12 Claims
OG exemplary drawing
 
1. An optical combiner comprising:
first optical input portions each comprising a first optical input waveguide; and
an optical output portion to which the first optical input portions are connected and that comprises:
cores that allow light to propagate therethrough, and
a cladding layer disposed outside of the cores and that has a refractive index lower than refractive indices of the cores, wherein
the first optical input portions are connected to a connection end face of the optical output portion such that the first optical input waveguide of at least one of the first optical input portions is optically coupled to one of the cores of the optical output portion, and
an outside diameter of the cladding layer on the connection end face of the optical output portion is less than a diameter of a smallest inclusive circle including all of the first optical input portions on the connection end face of the optical output portion.