US 12,470,040 B2
Light emitting apparatus, light source unit, light source apparatus, and optical fiber laser
Yuta Ishige, Tokyo (JP); Gabor Gajdatsy, Budapest (HU); and Masaya Nakazumi, Tokyo (JP)
Assigned to FURUKAWA ELECTRIC CO., LTD., Tokyo (JP)
Filed by FURUKAWA ELECTRIC CO., LTD., Tokyo (JP)
Filed on Jun. 1, 2022, as Appl. No. 17/804,924.
Application 17/804,924 is a continuation of application No. PCT/JP2020/045326, filed on Dec. 4, 2020.
Claims priority of application No. 2019-221501 (JP), filed on Dec. 6, 2019.
Prior Publication US 2022/0294174 A1, Sep. 15, 2022
Int. Cl. H01S 3/30 (2006.01); H01S 3/067 (2006.01); H01S 3/094 (2006.01); H01S 5/00 (2006.01); H01S 5/02253 (2021.01); H01S 5/02326 (2021.01); H01S 5/40 (2006.01); G02B 19/00 (2006.01); G02B 27/30 (2006.01)
CPC H01S 5/02326 (2021.01) [H01S 3/067 (2013.01); H01S 3/094049 (2013.01); H01S 3/094053 (2013.01); H01S 5/005 (2013.01); H01S 5/02253 (2021.01); H01S 5/4012 (2013.01); G02B 19/0052 (2013.01); G02B 27/30 (2013.01); H01S 3/0675 (2013.01); H01S 3/09408 (2013.01); H01S 5/4031 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A light emitting apparatus comprising:
a light emitting element having an emitting surface extending in a first direction, the light emitting element being configured to emit laser light and having a slow axis along the first direction and a fast axis along a second direction perpendicular to the first direction;
a case configured to house the light emitting element, the case including a window configured to allow transmittance of the laser light emitted from the light emitting element;
a first optical element provided outside the case and configured to converge, in a fast axis direction, the laser light passing through the window; and
a second optical element configured to collimate a laser light input via the first optical element, in the fast axis direction, in a state where a beam width in the fast axis direction is narrower than a beam width in the fast axis direction on an incident surface of the first optical element, the second optical element being located closer to the first optical element than a convergence point of the laser light in the fast axis direction by the first optical element.