Laser apparatus for generating a visible laser beam

• Main Authors: DELL'ACQUA STEFANO, PICCINNO GIULIANO
• Format: Patent
• Language: English
• Published: 08.03.2007
• Subjects: BASIC ELECTRIC ELEMENTS; DEVICES USING STIMULATED EMISSION; ELECTRICITY

A diode pumped laser apparatus for generating a visible power beam, of the type comprising: a miniaturised linear laser cavity ( 72 ) with very low losses, comprising at least the following optical elements ( 30,33,36,10,20 ): reflecting means ( 30;33;36 ), highly reflecting at a fundamental wavelength, at least one of said reflecting means ( 33 ) being traversed by a pumping beam ( 55 ), at least one of said reflecting means ( 36 ) reflecting at the fundamental wavelength and at the second harmonic wavelength and at least one of said reflecting means ( 33 ) being highly transmissive at the second harmonic ( 51 ) warelength of said fundamental wavelength; an active material ( 10 ) with polarized emission and with a gain configuration with small thermal aberration for the cavity mode, said active material ( 10 ) being able to generate laser light ( 50 ) at a fundamental wavelength; a non linear crystal ( 20 ), inside said cavity ( 72 ). According to the invention, said non linear crystal ( 20 ) is able to generate a second harmonic ( 51 ) of said fundamental wavelength by means of type I critical phase matching and said cavity ( 72 ) is associated to one or more thermostating means ( 45;41;42;43;44 ) to lock in temperature said cavity ( 72 ) and its optical elements ( 30,33,36,10,20 ), and accurately to set the temperature of the non linear crystal ( 10 ).