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:
Sep. 08, 1998
Filed:
Sep. 20, 1996
Mitsubishi Materials Corporation, Tokyo, JP;
Abstract
Single-crystal lithium tetraborate (single-crystal Li.sub.2 B.sub.4 O.sub.7 or single-crystal LBO) as an optical converter device which stably operates for a long term, has a long life, and is compact, light and inexpensive, an optical converter device using the single crystal LBO, especially, for emitting light having a wavelength of 500 nm or less, and an optical apparatus using the optical converter device. Coherent light irradiates the light incident face of the single-crystal LBO at a predetermined incident angle, which single-crystal LBO is cut at a predetermined plane to the optical axis in order to satisfy a predetermined phase matching angle, and light having a half wavelength of the incident light is emitted. Preferably, the single-crystal LBO has a refractive index variation of 10.sup.-5 /mm or less and/or a etch-pit density of approximately 1.times.10.sup.3 /cm.sup.2. A first coherent light beam having a first wavelength and a second coherent light beam having a wavelength one-half or one-fourth of the wavelength of the first coherent light beam irradiates the incident face of the single-crystal LBO at a predetermined angle, and at least a coherent light having a wavelength one-third or one-fifth of the wavelength of the first coherent light beam is emitted by sum frequency generation, for example, when light having a wavelength of 209 nm is emitted, the wavelength of the first coherent light is 981 nm and that of the second coherent light is 266 nm.