ALEXANDRIA, Va., Feb. 24 -- United States Patent no. 12,560,743, issued on Feb. 24, was assigned to HAMAMATSU PHOTONICS K.K. (Hamamatsu, Japan).
"Optical element for a low frequency band" was invented by Yoichi Kawada (Hamamatsu, Japan), Takashi Yasuda (Hamamatsu, Japan) and Hiroshi Satozono (Hamamatsu, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "The optical element for a low frequency band includes a substrate including a first main face and a second main face, the substrate having birefringence, and an antireflection film located on the first main face, wherein the low frequency band is lower than a reststrahlen band of the antireflection film, wherein an absolute value of a difference between a f...