Patent ID: 6741620
Filing Date: 2004-05-25
Classification: G02B,G02F,H01S

Abstract:
A method of generating ultraviolet light, comprising the steps of:tuning a neodymium-doped yttrium aluminum garnet crystal laser to output a first fundamental beam at approximately 946 nanometers; doubling the frequency of the first fundamental beam to produce a second harmonic beam having a wavelength of approximately 473 nanometers; orienting a cesium lithium borate crystal by a phase-matching angle that corresponds to a non-critical phase-matching condition; cooling said cesium lithium borate crystal to a temperature between âˆ’10 degrees centigrade and âˆ’20 degrees centigrade; and passing said second harmonic beam through said cesium lithium borate crystal to produce a fourth harmonic beam having a wavelength of approximately 236.5 nanometers.