Optical wavelength conversion element having a cesium-lithium-borate crystal
US7948673B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Sep 18, 2008 |
| Grant date | May 24, 2011 |
| Priority date | — |
| Expiry date | May 17, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/3551
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical wavelength conversion element includes a cesium-lithium-borate crystal processed into a 10-mm long optical element cut in an orientation that allows a fourth harmonic of a Nd:YAG laser to be generated. A transmittance (Ta) at 3589 cm−1 in an infrared transmission spectrum of the optical element is used as an index that indicates a content of water impurities in the crystal and is independent of a polarization direction. An actual measurement of the transmittance Ta is at least 1%, without taking into account loss at an optically polished surface of the crystal. A wavelength conversion device, a ultraviolet laser irradiation apparatus, a laser processing system, and a method of manufacturing an optical wavelength conversion element are also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.