The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 03, 2007
Filed:
Oct. 31, 2002
Masao Imaki, Tokyo, JP;
Syuhei Yamamoto, Tokyo, JP;
Youhei Mikami, Tokyo, JP;
Yoshihito Hirano, Tokyo, JP;
Makoto Satou, Tokyo, JP;
Kenji Masuda, Tokyo, JP;
Yasunori Nishimura, Tokyo, JP;
Yuji Masuyama, Tokyo, JP;
Masao Imaki, Tokyo, JP;
Syuhei Yamamoto, Tokyo, JP;
Youhei Mikami, Tokyo, JP;
Yoshihito Hirano, Tokyo, JP;
Makoto Satou, Tokyo, JP;
Kenji Masuda, Tokyo, JP;
Yasunori Nishimura, Tokyo, JP;
Yuji Masuyama, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Chiyoda-Ku, Tokyo, JP;
Abstract
On a plate of birefringent crystal made of an LiNbOcrystal or an LiTaOcrystal, a conductive substance is adhered to the whole periphery of side surfaces of the plate that intersect an incident surface of a laser beam, thereby to form a wave plate. A polarizer is provided at the latter stage of the wave plate. A wavelength is monitored based on an output from the polarizer. With this arrangement, based on the use of the LiNbOcrystal or the LiTaOcrystal that can be manufactured by a large quantity at low cost, it is possible to obtain polarization characteristics and wavelength discrimination characteristics that are stable against environmental changes such as temperature and external stress, by suppressing the pyroelectric effect and the piezoelectric effect of these materials.