US 12,422,350 B2
Multiple-reflection apparatus and multiple-reflection cell
Tomohiro Katsumata, Tokyo (JP); Kazuya Nakagawa, Tokyo (JP); and Jun Koshoubu, Tokyo (JP)
Assigned to JASCO CORPORATION, Tokyo (JP)
Filed by JASCO CORPORATION, Tokyo (JP)
Filed on Feb. 15, 2022, as Appl. No. 17/672,349.
Claims priority of application No. 2021-22509 (JP), filed on Feb. 16, 2021.
Prior Publication US 2022/0260816 A1, Aug. 18, 2022
Int. Cl. G01N 21/03 (2006.01); G02B 17/00 (2006.01); G02B 26/08 (2006.01)
CPC G01N 21/031 (2013.01) [G01N 21/0303 (2013.01); G02B 17/004 (2013.01); G02B 26/0816 (2013.01); G01N 2201/0636 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A multiple-reflection apparatus comprising:
a pair of parallel plane mirrors that multiply reflects a laser light, in zig zag, which enters at a specific angle φ of incidence;
a first right-angle double mirror provided on an edge of a first plane mirror, of the pair of parallel plane mirrors, at one end side of the pair of parallel plane mirrors and facing a second plane mirror of the pair of parallel plane mirrors, the first right-angle double mirror having two perpendicular reflection surfaces for returning a multiple-reflection light that travelled to the one end side between the parallel plane mirrors; and
a second right-angle double mirror provided on an edge of the second plane mirror of the pair of parallel plane mirrors at an other end side of the pair of parallel plane mirrors and facing the first plane mirror, the second right-angle double mirror having two perpendicular reflection surfaces for returning the multiple-reflection light again that travelled from the first right-angle double mirror on the one end side to the other end side between the parallel plane mirrors,
wherein two parallel mirror surfaces of the parallel plane mirrors are disposed to be parallel to a z-x plane of an x-y-z axis coordinate system,
the one end side is one end side in an x-axis direction of the x-y-z axis coordinate system,
the other end side is an other end side in the x-axis direction of the x-y-z axis coordinate system, and
the two reflection surfaces configuring the first right-angle double mirror and the two reflection surfaces configuring the second right-angle double mirror are perpendicular to an x-y plane of the x-y-z axis coordinate system, such that the laser light entering at the angle φ of incidence crosses the x-y plane at a specific angle φz.